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The asymmetric unit of the title complex, [MnI2(C8H6N4)2], contains one half of a neutral MnII complex, with the entire molecule completed by the application of twofold symmetry. The MnII ion is six-coordinated in a distorted octa­hedral environment defined by four N atoms of the two chelating 2,2′-bipyrimidine (bpym) ligands and two I anions in a cis-N4I2 coordination geometry. The dihedral angle between the least-squares planes of the two bpym ligands (r.m.s deviation for all non-H atoms = 0.063 Å) is 85.04 (6)°. In the crystal, complex mol­ecules are connected by C—H...N and C—H...I hydrogen bonds, forming a three-dimensional network. Mol­ecules are stacked in columns along the a axis. Along the c axis, successive mol­ecules stack in the opposite directions.

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In the title complex, [MnCl2(C10H9N3)2], the MnII ion is six-coordinated in a considerably distorted cis-N4Cl2 octa­hedral environment defined by four N atoms of two chelating di-2-pyridyl­amine (dpa) ligands and two Cl anions. In the crystal, the dpa ligands are not planar, the dihedral angles between the two pyridine rings being 29.3 (2) and 30.9 (2)°. The complex mol­ecules are stacked in columns along the c axis and are connected by inter­molecular N—H...Cl hydrogen bonds, forming a three-dimensional network. Weak inter- and intra­molecular π–π inter­actions are present between the pyridine rings, the shortest centroid—centroid distance being 4.406 (3) Å.

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In the title complex, [PdCl2(C13H9N)2], the PdII ion is four-coordinated in an essentially square-planar environment by two N atoms from two acridine ligands and two Cl anions. The Pd atom is located on an inversion centre, and thus the asymmetric unit contains one half of the complex and the PdN2Cl2 unit is exactly planar. The dihedral angle between the PdN2Cl2 unit and the acridine ligand is 84.66 (6)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis connected by C—H...Cl hydrogen bonds, forming chains along [110]. In the columns, numerous inter­molecular π–π inter­actions between the six-membered rings are present, the shortest ring centroid–centroid distance being 3.722 (4) Å.

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In the title complex, [PdI2(C11H9N)2], the PdII ion has a distorted trans-I2N2 square-planar coordination geometry defined by two N atoms from two 2-phenyl­pyridine ligands and two I anions. The 2-phenyl­pyridine ligands are not planar, the dihedral angles between the pyridine and benzene rings being 50.1 (2) and 45.7 (2)°. An inter­molecular π–π inter­action between the six-membered rings is present, the ring centroid–centroid distance being 3.898 (4) Å.

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The MnII ion in the title compound, [Mn(CH3CO2)2(C15H11N3)]·2H2O, is seven-coordinated in a considerably distorted penta­gonal–bipyramidal geometry by three N atoms of the tridentate 2,2′:6′,2′′-terpyridine ligand and four O atoms from two acetate anions which chelate the Mn atom via two O atoms. The lateral pyridine rings are slightly inclined to the central pyridine ring, making dihedral angles of 13.6 (2) and 5.7 (2)°. The complex and solvent water mol­ecules are linked by inter­molecular O—H...O hydrogen bonds into a three-dimensional network.

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In the title complex, [PdCl2(C9H7N)2], the PdII ion is four-coordinated in an essentially square-planar environment defined by two N atoms from two quinoline ligands and two Cl anions. The Pd atom is located on an inversion centre, and thus the asymmetric unit contains one half of the complex; the PdN2Cl2 unit is exactly planar. The dihedral angle between the PdN2Cl2 unit and quinoline ligand is 85.63 (8)°. In the crystal, the complex mol­ecules are stacked into columns along the b axis. In the columns, several inter­molecular π–π inter­actions between the six-membered rings are present, the shortest ring centroid–centroid distance being 3.764 (3) Å between pyridine rings.

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The PdII ion in the title complex, [Pd(NCS)2(C14H10N4)], is four-coordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating 2,3-di-2-pyridyl­pyrazine (dpp) ligand and two S atoms from two thio­cyanate anions. The pyridine rings are considerably inclined to the least-squares plane of the PdS2N2 unit [maximum deviation = 0.027 (1) Å], making dihedral angles of 70.3 (2) and 69.2 (1)°. The pyrazine ring is almost perpendicular to the PdS2N2 plane, with a dihedral angle of 86.3 (1)°. The thio­cyanate ligands are located on opposite sides of the PdS2N2 unit plane and are almost linear [N—C—S angles = 177.8 (6) and 178.9 (6)°]. The complex mol­ecules are stacked in columns along the b axis and are connected by inter­molecular C—H...N hydrogen bonds, forming chains along the a axis.

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In the title complex, [Pd(N3)2(C12H8N2)], the PdII ion is four-coordinated in a slightly distorted square-planar environment by two N atoms of the chelating 1,10-phenanthroline (phen) ligand and two N atoms from two azide anions. The azido ligands are slightly bent with bond angles of 174.8 (4) and 174.5 (5)°. The complex mol­ecules are stacked in columns along the a axis and are connected by inter­molecular C—H...N hydrogen bonds, forming a three-dimensional network. In the columns, numerous inter­molecular π–π inter­actions between the six-membered rings are present, the shortest ring centroid–centroid distance being 3.607 (2) Å.

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The asymmetric unit of the title compound, [Pd(C6H5N2O)(C6H6N2O)]Cl, contains one half of a cationic PdII complex and a Cl anion, with a crystallographic mirror plane parallel to the ac plane passing through the Pd and Cl atoms. In the complex, the PdII ion is four-coordinated in a distorted square-planar environment by four N atoms derived from the two chelating ligands. The hy­droxy H atom lies on the mirror plane and so is equidistant from the O atoms. This indicates that the negative charge is delocalized over the two O atoms. The complex mol­ecules are stacked in columns along the c axis and are connected by C—H...O hydrogen bonds, forming a three-dimensional network. The structure reported herein represents a new monoclinic polymorph of the previously reported monoclinic (C2/c) form [Torabi et al. (2007). Z. Kristallogr. New Cryst. Struct. 222, 197–198].

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The title compound, C13H10N+·C7H4NO4, consists of a protonated acridinium cation and a 6-carb­oxy­pyridine-2-carboxyl­ate monoanion. The carboxyl­ate group of the anion appears to be delocalized on the basis of the nearly equivalent C—O bond lengths. In the crystal, the anions are connected by strong O—H...O hydrogen bonds, forming chains along the b axis. The acridinium cations are linked to the anionic chains by strong N—H...O hydrogen bonds between the carboxyl­ate group of the anion and the N—H group of the cation. Along the b axis, successive chains stack in opposite directions. Weak inter­molecular C—H...O hydrogen bonds further stabilize the crystal structure.

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In the title complex, [Pt(NCS)2(C10H9N3)], the PtII ion is four-coordinated in a distorted square-planar environment by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two mutually cis S atoms from two linear thio­cyanate anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 30.8 (4)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis and are connected by inter­molecular N—H...N hydrogen bonds, forming supra­molecular chains along the b axis.

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In the title complex, [Pt(N3)4(C10H9N3)], the PtIV ion is six-coordinated in a slightly distorted octa­hedral environment by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and four N atoms from four azide anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 20.0 (3)°. The azide ligands are slightly bent [N—N—N = 173.5 (8)–175.1 (8)°]. In the crystal, the complex mol­ecules are connected by N—H...N hydrogen bonds, forming a chain along the b axis. An inter­molecular π–π inter­action between the chains is also present, the ring centroid–centroid distance being 3.713 (4) Å.

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The PtII ion in the title complex, [PtBr2(C10H9N3)], is four-coordinated in an essentially square-planar environment by two N atoms from a chelating di-2-pyridyl­amine (dpa) ligand and two Br anions. The dpa ligand is not planar, with the dihedral angle between the pyridine rings being 40.8 (2)°. The complex mol­ecules are stacked in columns along [001] through π–π inter­actions between the pyridine rings [centroid–centroid distances = 3.437 (3) and 3.520 (3) Å]. Inter­molecular N—H...Br hydrogen bonds connect the mol­ecules into chains running along [010]. Intra­molecular C—H...Br interactions are also observed.

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In the title complex, [Pd(C7H3NO4)(C13H9N)], the PdII ion is four-coordinated in a distorted square-planar environment by one N and two O atoms from the tridentate pyridine-2,6-dicarboxyl­ate (dipic) anionic ligand and one N atom of the acridine (acr) ligand. The dipic and acr ligands are nearly planar [maximum deviation = 0.069 (3) Å in dipic and 0.091 (4) Å in acr] and the dihedral angle between their mean planes is 58.67 (7)°. The Pd—O bond lengths are nearly equal, but the Pd—N bond lengths are slightly different. There is a short C—H...O inter­action in the mol­ecule involving the two ligands. In the crystal, complex mol­ecules are linked through C—H...O inter­actions, forming a three-dimensional network. There are also a number of inter­molecular π–π inter­actions present, the shortest ring centroid–centroid distance being 3.622 (3) Å.

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The PtII ion in the title complex, [PtI2(C10H9N3)], is four-coordinated in a distorted square-planar environment defined by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and by two I anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 52.8 (3)°. Pairs of complex mol­ecules are assembled through inter­molecular N—H...I hydrogen bonds, forming a dimer-type species. The complexes are stacked in columns along the b axis and display several inter­molecular π–π inter­actions between the pyridine rings, with a shortest ring centroid–centroid distance of 3.997 (5) Å.

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In the title compound, [PtCl2(C9H7N)2]·CH3NO2, the PtII cation is four-coordinated in an essentially square-planar environment by two N atoms from two quinoline ligands and two Cl anions. One of the nearly planar quinoline ligands [maximum deviations = 0.042 (6) and 0.018 (7) Å] is almost perpendicular to the PtCl2N2 unit [maximum deviation = 0.024 (3) Å], making a dihedral angle of 89.6 (1)°, whereas the other is slightly inclined to the central plane with a dihedral angle of 74.1 (1)°. The dihedral angle between the quinoline ligands is 88.3 (2)°. In the crystal, each solvent mol­ecule is linked to the metal complex by weak inter­molecular C—H...O hydrogen bonds.

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The asymmetric unit of the title compound, [Pd(C10H9N3)2](NO3)2, contains one half of a cationic PdII complex and one NO3 anion. In the complex, the PdII ion is four-coordinated by four pyridine N atoms derived from the two chelating dipyridin-2-yl­amine (dpa) ligands. The PdII atom is located on an inversion centre, and thus the PdN4 unit is exactly planar. The dpa ligand itself is not planar, showing a dihedral angle between the pyridine rings of 39.9 (1)°. The anions are connected to the complex by inter­molecular N—H...O hydrogen bonds between the two O atoms of the anion and the N—H group of the cation. Weak inter­molecular C—H...O hydrogen bonds additionally link the constituents in the crystal structure. The NO3 anion was found to be disordered over two sites with a site-occupancy factor of 0.55 (10) for the major component.

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In the title complex, [Pd(CH3COO)2(C10H9N3)], the PdII ion is four-coordinated in a slightly distorted square-planar environment by two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two O atoms from two anionic acetate ligands. The dpa ligand coordinates the PdII atom in a boat conformation of the resulting chelate ring; the dihedral angle between the pyridine rings is 39.3 (2)°. The two acetate anions coordinate the PdII atom as monodentate ligands and are located on the same sides of the PdN2O2 unit plane. The carboxyl­ate groups of the anionic ligands appear to be delocalized on the basis of the C—O bond lengths. Two complex mol­ecules are assembled through inter­molecular N—H...O hydrogen bonds, forming a dimer-type species. Inter­molecular C—H...O hydrogen bonds further stabilize the crystal structure.

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The asymmetric unit of the title compound, [Pt(C10H9N3)2]Br2·H2O, contains two crystallographically independent half-mol­ecules of the cationic PtII complex, two Br anions and a lattice water mol­ecule; an inversion centre is located at the centroid of each complex. Each PtII ion is four-coordinated in an essentially square-planar environment by four pyridine N atoms derived from the two chelating di-2-pyridyl­amine (dpa) ligands, and the PtN4 unit is exactly planar. The chelate ring formed by the dpa ligand displays a boat conformation, with dihedral angles between the pyridine rings of 35.9 (2) and 41.0 (2)°. The complex cations, Br anions and solvent water mol­ecules are linked by O—H...Br, N—H...Br, C—H...O and C—H...Br hydrogen bonds, forming a three-dimensional network.

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In the title complex, [Pd(N3)2(C10H9N3)], the PdII ion is in a slightly distorted square-planar coordination environment. The ligator atoms comprise the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two N atoms from two azide anions. The dpa ligand coordinates the Pd atom in a boat conformation, the dihedral angle between the pyridine rings being 24.4 (1)°. The pyridine rings are somewhat inclined to the least-squares plane of the PdN4 unit, making dihedral angles of 29.02 (9) and 26.47 (9)°. The azide ligands are slightly bent, with N—N—N angles of 173.0 (4) and 174.2 (4)°. In the crystal, mol­ecules are connected by N—H...N and C—H...N hydrogen bonds, forming chains along the c axis. When viewed down the b axis, successive chains are stacked in opposite directions. Intra­molecular C—H...N hydrogen bonds are also observed.

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In the title complex, trans-[PtCl2(C9H7N)2], the PtII ion is four-coordinated in an essentially square-planar coordination environment defined by two N atoms from two quinoline (qu) ligands and two Cl anions. The Pt atom is located on an inversion centre and thus the asymmetric unit contains one half of the complex; the PtN2Cl2 unit is exactly planar. The dihedral angle between the PtN2Cl2 unit and the quinoline ligand is 85.1 (1)°. In the crystal, the complex mol­ecules are stacked into columns along the b axis. In the columns, several inter­molecular π–π inter­actions between the six-membered rings are present, the shortest ring centroid–centroid distance being 3.733 (5) Å between pyridine rings.

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The asymmetric unit of the title compound, K2[Pd(NCS)4]·2[Pd(NCS)2(C8H6N4)], contains two crystallographically independent half-mol­ecules of the anionic PdII complex, two K+ cations and two independent neutral PdII complexes; an inversion centre is located at the centroid of each anionic complex. In the anionic complexes, each PdII ion is four-coordinated in an almost regular square-planar environment by four S atoms from four SCN anions, and the PdS4 unit is exactly planar. In the neutral complexes, the PdII ion has a slightly distorted square-planar coordination environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine ligand and two mutually cis S atoms from two SCN anions. Both 2,2′-bipyrimidine ligands are almost planar [dihedral angle between the rings = 3.98 (16) and 4.57 (17)°] and also chelate to a potassium ion from their other two N atoms. In the crystal, the K+ ions inter­act with various S and N atoms of the ligands, forming a three-dimensional polymeric network, in which the shortest K...K contacts between the KN7S polyhedra are 4.4389 (17) and 4.4966 (18) Å. Intra- and inter­molecular C—H...S and C—H...N hydrogen bonds are also observed.

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The PdII ion in the title complex, [PdBr2(C18H12N2)], is four-coordinated in a distorted square-planar environment by the two N atoms from the chelating 2,2′-biquinoline (Biqu) ligand and two mutually cis Br anions. The Biqu ligand is not planar, the dihedral angle between the quinoline systems being 17.2 (2)°. In the crystal, the complex mol­ecules are connected by C—H...Br hydrogen bonds, forming chains along the c axis. When viewed down the b axis, successive chains are stacked in opposite directions. Intra­molecular C—H...Br hydrogen bonds are also observed.

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In the title complex, [Pt(NCS)2(C8H6N4)], the PtII ion is four-coordinated in a distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine (bpym) ligand and two mutually cis N atoms from two SCN anions. The thio­cyanate ligands are almost linear, displaying N—C—S bond angles of 178.6 (11) and 173.7 (11)°, and the N atoms are slightly bent coordinated to the Pt atom with Pt—N—C bond angles of 172.7 (9) and 160.4 (10)°. In the crystal, mol­ecules are held together by C—H...S hydrogen bonds. Intra­molecular C—H...N hydrogen bonds are also observed

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The PtII ion in the title complex, [PtI2(C14H10N4)], exists in a distorted square-planar environment defined by the two pyridine N atoms of the chelating 2,3-di-2-pyridyl­pyrazine ligand and two iodide anions. The pyridine rings are inclined to the least-squares plane of the PtI2N2 unit [maximum deviation = 0.070 (3) Å] at 66.1 (2) and 65.9 (2)°; the pyrazine ring is perpendicular to this plane [dihedral angle = 89.7 (2)°]. Two inter­molecular C—H...I hydrogen bonds, both involving the same I atom as hydrogen-bond acceptor, generate a layer structure extending parallel to (001). Mol­ecules are stacked in columns along the a axis. Along the b axis, successive mol­ecules stack in opposite directions.

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In the title complex, [PdI2(C8H6N4)], the PdII ion is four-coordinated in a slightly distorted square-planar environment defined by two pyrimidine N atoms derived from a chelating 2,2′-bipyrimidine (bpym) ligand and two mutually cis iodide anions. The nearly planar bpym ligand [maximum deviation = 0.053 (3) Å] is slightly inclined to the least-squares plane of the PdI2N2 unit [maximum deviation = 0.055 (2) Å], making a dihedral angle of 3.9 (2)°. In the crystal, pairs of complex mol­ecules are assembled by inter­molecular C—H...N hydrogen bonds into dimers. Intra­molecular C—H...I hydrogen bonds are also observed.

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The PtIV ion in the title complex, [PtBr4(C10H9N3)], is six-coordinated in a slightly distorted octa­hedral environment by two pyridine N atoms from a chelating di-2-pyridyl­amine (dpa) ligand and four Br anions. The complex mol­ecule has mirror symmetry, with the PtIV atom, two Br atoms and the central N atom of the dpa ligand lying on the mirror plane. The dpa ligand is not planar, showing a dihedral angle of 34.7 (2)° between the pyridine rings. The complex mol­ecules are connected by inter­molecular N—H...Br hydrogen bonds, forming chains along [001]. Inter­molecular C—H...Br hydrogen bonds and π–π inter­actions between the pyridine rings [centroid–centroid distance = 3.667 (4) Å] are also observed.

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The PdII ion in the title complex, [PdI2(C10H9N3)], is four-coordinated in a distorted square-planar environment defined by the two pyridine N atoms of the chelating di-2-pyridyl­amine (dpa) ligand and two I anions. The dpa ligand is not planar, the dihedral angle between the pyridine rings being 51.2 (2)°. In the crystal, pairs of complex mol­ecules are assembled through inter­molecular N—H...I hydrogen bonds into dimeric species. The complexes are stacked in columns along the b axis and display several inter­molecular π–π inter­actions between the pyridine rings, with a shortest ring centroid–centroid distance of 3.957 (3) Å.

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The PdII atom of the title salt, [Pd(C10H9N3)2](NCS)2, lies on a center of inversion and exists in a square-planar environment defined by the four pyridine N atoms derived from the two chelating di-2-pyridyl­amine (dpa) ligands. The chelate ring displays a boat conformation with a dihedral angle between the pyridine rings of 43.0 (1)°. Adjacent thio­cyanate ions are linked to the cations by N—H...N hydrogen bonds.

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In the title complex, [PtBr2(C11H9N)2], the PtII ion has a distorted cis-Br2N2 square-planar coordination geometry defined by two N atoms from two 2-phenyl­pyridine (ppy) ligands and two Br anions. The ppy ligands are not planar, the dihedral angles between the pyridine and benzene rings being 49.0 (3) and 47.3 (3)°. In the crystal, the complex mol­ecules are stacked in columns along the a axis. In the columns, there are numerous intra- and inter­molecular π–π inter­actions between the six-membered rings, the shortest ring centroid–centroid distance being 3.774 (6) Å.

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The title compound, C17H20N2O3, is a Schiff base, which is found as a zwitterion in the solid state. The geometry around the iminium N atom indicates sp2-hybridization. The zwitterion shows a strong intra­molecular N—H...O hydrogen-bond inter­action between the iminium N atom and the phenolate O atom.

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The title compound, C24H24N2O4·CH3CN, a disubstituted benzimidazole, crystallized as an acetonitrile monosolvate. The benzene ring of the 2-eth­oxy-6-methyl­phenol substiuent is approximately perpendicular to the nearly planar benzimidazole ring system [maximum deviation = 0.016 (1) Å], making a dihedral angle of 84.27 (8)°. The benzene ring of the 2-eth­oxy­phenol substituent is inclined to the benzimidazole mean plane by 29.68 (8)°. The dihedral angle between the benzene rings is 80.36 (9)°. In the mol­ecule, there are strong O—H...N and O—H...O hydrogen bonds. In the crystal, mol­ecules are connected by bifurcated O—H...(O,O) hydrogen bonds, forming chains propagating along [010].

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The title compound, C17H16N4O6, is a Schiff base, which is found as a bis-zwitterion in the solid state. The geometry around the iminium N atom indicates sp2-hybridization. The diiminiumpropyl­ene chain is in an approximate double-gauche conformation, with average N—C—C—C torsion angles of 69.3°. The zwitterion shows strong intra­molecular N—H...O hydrogen bonds between the iminium N and phenolate O atom. In the crystal, bifurcated N—H...(O,O) hydrogen bonds assemble pairs of molecules into inversion dimers.

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The title compound, C20H20Br2N2O2, a tetra­dentate Schiff base, is the enanti­omerically pure R,R-diastereomer of four possible stereoisomers. The mol­ecular structure reveals two strong intra­molecular O—H...N hydrogen bonds between the hy­droxy O atom and the imino N atom, which each generate S(6) rings. In the crystal, mol­ecules are stacked in columns along the a axis; when viewed down the b axis, successive columns are stacked in the opposite direction. The structure reported herein is the monoclinic polymorph of the previously reported ortho­rhom­bic form [Yi & Hu (2009). Acta Cryst. E65, o2643], in which the complete mol­ecule is generated by a crystallographic twofold axis.

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In the title solvate, C24H24N2O4·CH3NO2, the benzene ring of the 2-eth­oxy-6-methyl­phenol substituent is approximately perpendicular to the nearly planar benzimidazole ring [maximum deviation = 0.021 (2) Å], making a dihedral angle of 84.32 (7)°. The benzene ring of the 2-eth­oxy­phenol group is somewhat inclined to the benzimidazole ring plane by 28.03 (5)°. The dihedral angle between the benzene rings is 82.20 (9)°. The compound reveals strong intra­molecular O—H...N and O—H...O hydrogen bonds, forming six- and five-membered rings, respectively. In the crystal, mol­ecules are connected by bifurcated O—H...(O,O) hydrogen bonds, forming chains along the b axis.
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