Tripotassium (bis­{[bis­(carboxyl­atometh­yl)amino]­meth­yl}phosphinato)cuprate(II) dihydrate

In the title compound, K₃[Cu(C₁₀H₁₂N₂O₁₀P)]·2H₂O, the Cu^II ion, one potassium cation and a P atom are situated on a twofold rotation axis. The Cu^II ion is coordinated by two N and four O atoms from one bis­{[bis­(carboxyl­atometh­yl)amino]­meth­yl}phosphinate ligand in a distorted octa­hedral coordination geometry. The two crystallographically independent potassium ions exhibit different coordination environments. The potassium ion in a general position is hepta­coordinated by five carboxyl­ate O atoms, one phosphinate O atom and one water mol­ecule [K—O = 2.718 (3)–3.040 (3) Å], and the potassium ion situated on the twofold rotation axis is hexa­coordinated by four carboxyl­ate O atoms and two water mol­ecules [K—O = 2.618 (3)–2.771 (3) Å]. The water mol­ecules are also involved in formation of inter­molecular O—H...O hydrogen bonds.

Bis(1,10-phenanthroline-5,6-dione-κ²N,N′)silver(I) 2-hy­droxy-3,5-dinitro­benzoate

In the cation of the title salt, [Ag(C₁₂H₆N₂O₂)₂](C₇H₃N₂O₇), the Ag^I atom is coordinated in a distorted tetra­hedral geometry by four N atoms from two 1,10-phenanthroline-5,6-dione ligands, while the 3,5-dinitro­salicylate anion has only a short contact [2.847 (6) Å] between one of its O atoms and the Ag^I atom. The dihedral angle between the two 1,10-phenanthroline-5,6-dione ligands is 58.4 (1)°. There is an intra­molecular O—H...O hydrogen bond in the 3,5-dinitro­salicylate anion.

2,4,5-Tris(pyridin-4-yl)-1H-imidazole monohydrate

In the crystal structure of the title compound, C₁₈H₁₃N₅·H₂O, adjacent mol­ecules are linked by O—H...N and N—H...O hydrogen bonds, generating a chain propagating along [001].

cyclo-Tetra­kis{μ-2,2′-dimethyl-1,1′-[2,2-bis­(bromo­meth­yl)propane-1,3-di­yl]di(1H-benzimidazole)-κ²N³:N^3′}tetra­kis­[bromidocopper(I)]

The title compound, [Cu₄Br₄(C₂₁H₂₂Br₂N₄)₄], features a macrocyclic Cu₄L₄ ring system in which each Cu^I atom is coordinated by one bromide ion and two N atoms from two 2,2′-dimethyl-1,1′-[2,2-bis­(bromo­meth­yl)propane-1,3-di­yl]di(1H-benzimidazole) (L) ligands in a distorted trigonal–planar geometry. The L ligands adopt either a cis or trans configuration. The asymmetric unit contains one half-mol­ecule with the center of the macrocycle located on a crystallographic center of inversion. Each bromide ion binds to a Cu^I atom in a terminal mode and is oriented outside the ring. The macrocycles are inter­connected into a two-dimensional network by π–π inter­actions between benzimid­azole groups from different rings [centroid–centroid distance = 3.803 (5) Å.

N-{2-[4-(2-Hy­droxy­eth­yl)piperazin-1-yl]eth­yl}phthalimide

In the title compound, C₁₆H₂₁N₃O₃, the piperazine ring adopts a chair conformation, with its N—C bonds in pseudo-equatorial orientations. In the crystal, mol­ecules are linked by O—H...N hydrogen bonds, generating C(5) chains propagating in [101]. Weak aromatic π–π stacking inter­actions also occur [centroid–centroid separation = 3.899 (1) Å].

5-Sulfanyl­idene-2H,5H-1,3-dithiolo[4,5-d][1,3]dithiol-2-one

The title mol­ecule, C₄OS₅, is essentially planar, with an r.m.s. deviation of 0.032 (3) Å. All the C—S single bonds are shorter than the standard Csp³—S single-bond length, showing the π-conjugated nature of the molecule. In the crystal, molecules lie parallel to one another and pack in columns along the a axis. Short inter­molecular S...S contacts [3.314 (3), 3.482 (2) and 3.501 (2) Å] are observed between the columns. The angle between the two mol­ecular dipole moments in the unit cell is 39.3 (1)° and the macro-polarization vector is along the [1 0 − 1.41] direction. As a result of the high polarization and π-conjugation of the structure, the crystalline powder exhibits a second harmonic generating intensity, which is as strong as that of the urea standard powder crystals, when irradiated by a 1053 nm laser beam. The diffraction space of the crystal showed a nonmerohedral twinning.

Poly[bis­(μ₇-3-sulfonato-L-alaninato)sodiumzinc]

The hydro­thermal reaction of Zn(CH₃COO)₂, NaOH and L-cysteic acid produced the title compound, [Na₂Zn(C₃H₅NO₅S)₂]_n. The Zn^II cation is situated on an inversion centre and is in a distorted octa­hedral environment, being chelated by two deprotoned L-cysteic acid ligands through two amino N atoms and two carb­oxy­lic O atoms, with the two axial positions occupied by two carb­oxy­lic O atoms from two other L-cysteic acid ligands. Each L-cysteic acid ligand bridges five Na^I ions via its sulfonate group and two Zn^II ions via its carboxyl group, forming a three-dimensional framework. Weak N—H...O hydrogen bonding is observed in the crystal structure.

2,2′-Dimethyl-1,1′-[2,2-bis­(bromo­methyl)propane-1,3-di­yl]dibenzimidazole hemihydrate

The title compound, C₂₁H₂₂Br₂N₄·0.5H₂O, contains two benzimidazole groups which may provide two potential coordination nodes for the construction of metal–organic frameworks. The mean planes of the two imidazole groups are almost perpendicular, with a dihedral angle of 83.05 (2)°, and adjacent mol­ecules are linked into a one-dimensional chain by π–π stacking inter­actions between imidazole groups of different mol­ecules [centroid-to-centroid distances of 3.834 (2) and 3.522 (2) Å].

Tetra­aqua­bis­(6-chloro­pyridine-3-carboxyl­ato-κO)nickel(II) tetra­hydrate

In the title compound, [Ni(C₆H₃ClNO₂)₂(H₂O)₄]·4H₂O, the Ni^II ion is located on an inversion centre and is octa­hedrally coordinated by four O atoms from four water mol­ecules in the equatorial plane and two O atoms of two 6-chloro-3-carboxyl­ate ligands in axial positions. There are also four lattice water molecules present. The organic ligands are bound to the Ni^II ion in a monodentate manner through a carboxyl­ate O atom. There is one strong intra­molecular O—H...O hydrogen bond and six inter­molecular O—H...O and O—H...N hydrogen-bonding inter­actions in the packing, resulting in a complex three-dimensional network structure.

Tetra­aqua­bis­(6-chloro­pyridine-3-carboxyl­ato-κO)cobalt(II) tetra­hydrate

In the title compound, [Co(C₆H₃ClNO₂)₂(H₂O)₄]·4H₂O, the Co^II cation is located on an inversion center and is coordinated by four water mol­ecules and two 6-chloro­pyridine-3-carboxyl­ate anions in a slightly distorted octa­hedral geometry. In the crystal, complex mol­ecules and lattice water mol­ecules are linked by O—H...O and O—H...N hydrogen bonds into a three-dimensional network.

catena-Poly[[[diaqua­copper(II)]-μ-quinoline-2,3-dicarboxyl­ato-κ³N,O²:O³] monohydrate]

In the title compound, {[Cu(C₁₁H₅NO₄)(H₂O)₂]·H₂O}_n, the Cu^II ion is five-coordinated by two O atoms and one N atom of two symmetry-related quinoline-2,3-dicarboxyl­ate ligands, and two water mol­ecules. The water mol­ecules occupy basal and apical positions of the square-pyramidal coordination polyhedron. Each quinoline-2,3-dicarboxyl­ate dianion bridges two adjacent Cu^II ions, forming a polymeric chain along [010]. The chains are further connected via O—H...O hydrogen-bonding inter­actions and quinoline ring π–π inter­actions [centroid–centroid distance = 3.725 (4) Å], generating a three-dimensional structure. Lattice water mol­ecules participate in the crystal structure via O—H...O hydrogen bonds.