The title inorganic-organic hybrid complex, [CdBr₂(C₁₀H₈N₂)]_n, features two-dimensional [CdBr₂(4,4'-bipy)]_n (4,4'-bipy is 4,4'-bipyridine) neutral networks, based on the octa­hedral Cd atom coordinated by four ₂-Br and two ₂-4,4'-bipy at trans positions, yielding a CdBr₄N₂ octa­hedron. It crystallizes in the orthorhombic system (Cmmm). All the crystallographically independent atoms are on special positions, namely Cd on mmm, Br on mm, N on mm2, and C on sites of symmetry m or mm2. Optical absorption spectroscopy reveals the presence of an optical gap of 3.76 eV, indicating that the complex is a wide-gap semiconductor. Photoluminescence investigation reveals that the complex displays strong colour-tunable emissions, which might originate from a ligand-to-ligand charge-transfer (LLCT) transition. Thermogravimetric differential thermal analysis shows that the complex is thermally stable up to 493 K.

The title compound, (C₁₀H₁₀N₂)[CdBr₄], was synthesized via a hydro­thermal reaction. Its structure features discrete 4,4′-bipyridinium cations and tetra­hedral [CdBr₄]²⁻ anions linked into ion pairs by single N—HBr hydrogen bonds. Photoluminescent investigation reveals that the title compound displays a strong emission in the blue region, which may originate from π → π* charge-transfer inter­actions of the 4,4′-bipyridinium cations.

The Cd atom in the title complex, [Cd(NO₃)₂(C₁₅H₁₃N₅)]·H₂O or [Cd(NO₃)₂(tpdaH₂)]·H₂O (tpdaH₂ is tripyridyldiamine), has a penta­gonal-bipyramidal coordination formed by the tridentate tpdaH₂ ligand and two chelate nitrate groups. The tpdaH₂ ligand is mer-coordinated, with the N atom of the central pyridine ring in the equatorial position [Cd-N = 2.3148 (17) Å] and the N atoms of the peripheral pyridine rings in the axial positions [Cd-N = 2.2345 (19) and 2.2351 (19) Å, and N-Cd-N = 169.39 (6)°]. The remaining four equatorial positions are occupied by the four O atoms of two nitrate groups, one of which has almost equal Cd-O bond lengths [2.431 (2) and 2.4644 (19) Å], whereas the other shows a significant difference between the Cd-O bond lengths [2.441 (2) and 2.603 (2) Å]. The H atoms of both NH groups of the tpdaH₂ ligand are involved in hydrogen bonds with water O atoms as acceptors, whereas both water H atoms form hydrogen bonds with the O atoms of one of the nitrate groups. The hydrogen bonds link the mol­ecules of the title complex and solvent mol­ecules into an infinite three-dimensional network.

The title compound, C₂₀H₁₄Cl₂N₂O₂, was prepared by the one-step condensation of o-phenyl­enediamine with 5-chloro-2-hydroxy­benzaldehyde. The dihedral angles between the benzimidaloe ring system and the benzene rings are 77.2 (2) and 87.1 (2)° Mol­ecules are linked by O—HN inter­molecular hydrogen bonds, forming one-dimensional infinite chains, and the chains are linked by C—Clπ(Ar) inter­actions, forming a two-dimensional network.

The title compound, C₁₇H₁₈N₄O₂S·C₂H₅OH, has been synthesized by the reaction of thio­carbohydrazide with 2-methoxy­benzaldehyde in ethanol. The two aromatic rings are not coplanar, making an angle of 34.8 (2)°. Strong inter­molecular (N—HO and O—HN) and weak inter­molecular hydrogen bonds (N—HS and C—HO) are found in the crystal structure. These hydrogen bonds link the mol­ecules of the Schiff base and ethanol mol­ecules into an infinite chain. Aromatic stacking inter­actions are also found in the crystal structure.

The title compound, [Sn(C₆H₅)₃(C₁₉H₁₆N₃O₃)], is a four-coordinate Sn^IV complex, with a distorted tetra­hedral geometry and one disordered (0.54:0.46) phenyl ring. The Schiff base carboxyl­ate group acts as a monodentate ligand coordinating through the deprotonated hydroxyl O atom. In the crystal structure, a weak offset face-to-face aromatic π–π stacking inter­action can be found between the pyrazole ring and the benzene ring of 4-formyl­benzoic acid. The centroid-to-centroid distance is 3.858 (2) Å and the interplanar distance is 3.375 (4) Å.

The title complex, [Sn₂(CH₃)₄(C₆H₁₁NO₅)₂]·0.5C₄H₈O₂, comprises the centrosymmetric cyclic dimeric Sn^IV complex and an uncoordinated, partially occupied, centrosymmetric dioxane mol­ecule. Each Sn^IV atom has a distorted octa­hedral six-coordinate configuration formed by the tridentate tricine ligand, one bridging O atom and two methyl groups. Within the cyclic dimer, the SnSn separation is 3.6574 (4) Å. All H atoms of the NH and OH groups are involved in inter­molecular hydrogen bonds with the O atoms as acceptors. There are also important weak inter­molecular C—HO hydrogen bonds, which link the mol­ecules of the dimer and dioxane into an infinite three-dimensional network.

The title triazole compound, C₁₅H₈Cl₄N₄S·C₃H₇NO, has been obtained as an unexpected product when attempting to prepare Schiff bases of thio­carbohydrazide (TCH). The triazole ring is planar within 0.004 (8) Å because of conjugation. The dihedral angles between the 1,2,4-triazole ring and the two benzene rings are 24.9 (2) and 70.0 (2)°. The interplanar angle between the two benzene rings is 83.4 (2)°. The packing of the mol­ecules is stabilized both by van der Waals interactions and by N—HO intermolecular hydrogen bonds between the triazole N atom and the carbonyl O atom of the di­methyl­form­amide solvent mol­ecule.

In the title compound, [Sn(CH₃)₂(C₁₅H₁₂N₄O₂S)], there are two independent mol­ecules in the asymmetric unit which have almost identical geometries. It is a penta­coordinated Sn^IV complex, with distorted trigonal–bipyramidal geometry. 1,5-Bis(2-hydroxy­benzyl­idene)thio­carbonohydrazide acts as a tridentate ligand, coordinating through the deprotonated phenolate O atom, imino N atom and thiol­ate S atom. Strong inter­molecular N—HN hydrogen bonds lead to the formation of dimers; the dimers are held together by van der Waals forces.

The asymmetric unit of the unexpected title compound, 2,2,6,6-tetra-n-butyl-2,6-dichloro-4,8-bis­{[(1E)-4-methoxy­benzyl­idene]hydrazino}-1,5-diaza-2,6-distanna-3,7-dithia­bicyclo­[3.3.0]octa-3,7-diene bis{1,5­[(1E)-4-methoxy­benzyl­idene]thio­carbonohydrazide} ethanol disolvate, [Sn₂(C₄H₉)₄Cl₂(C₁₈H₁₈N₆O₂S₂)]·2C₁₇H₁₈N₄O₂S·2C₂H₅OH, comprises one half-mol­ecule of the organotin complex, one thio­carbonohydrazide molecule and one ethanol solvent mol­ecule, and is the first example of a substituted C₂N₂S₂Sn₂ planar dicyclo–organotin complex. Each Sn^IV atom is penta­coordinated with a distorted trigonal–bipyramidal geometry and the complex is disposed across a crystallographic centre of inversion. Weak inter­molecular N—HCl and C—HCl hydrogen bonds and weak SS inter­actions link the mol­ecules of the organotin complex into one-dimensional infinite chains.

The title complex, [Sn(C₆H₅)₃(C₁₄H₉N₂O₂)(H₂O)]·C₄H₈O₂, is composed of a triphenyl­tin carboxyl­ate with a coordinated water mol­ecule and a free dioxane mol­ecule. The Sn^IV atom is five-coordinate and has a trans-C₃SnO₂ trigonal–bipyramidal geometry, with the three phenyl groups occupying the equatorial plane, the 4-(1H-benzimidazol-2-yl)benzoate ligand coordinating in a monodentate manner and a water mol­ecule in the axial positions. Strong inter­molecular O—HO and N—HO hydrogen bonds link the mol­ecules into an infinite two-dimensional network, with these networks held together by van der Waals forces to generate a layer structure. π–π Stacking inter­actions also exist in the crystal structure.

A heteronuclear Zn^II–Eu^III complex (systematic name: {6,6′-dieth­oxy-2,2′-[ethane-1,2-diylbis(nitrilo­methyl­idyne)]­diphenol­ato-1κ⁴O¹,O^1′,O⁶,O^6′:2κ⁴O¹,N,N′,O^1′}trinitrato-1κ⁶O,O′-europium(III)zinc(II)), [EuZn(C₂₀H₂₂N₂O₄)(NO₃)₃], with the hexa­dentate Schiff base compartmental ligand N,N′-bis­(3-ethoxy­salicyl­idene)ethyl­enediamine, has been synthesized and structurally characterized. The Zn and Eu atoms are doubly bridged by two phenolate O atoms provided by the Schiff base ligand. The coordination of Zn is square planar with the donor centers of two imine N atoms and two phenolate O atoms. The Eu center has a decacoordination environment formed by the phenolate O atoms, two ethoxy O atoms and two O atoms from each of the three nitrates. No classical inter­molecular hydrogen bonds are found. Some weak C—HO and OZn inter­actions [OZn = 3.193 (4) Å] generate a two-dimensional zigzag sheet.

The title compound, C₂₀H₁₉N₃O₄·H₂O, has been synthesized by the reaction of 2-(2-formyl­phen­oxy)acetic acid with 4-amino­anti­pyrine in ethanol. It comprises a 4-amino­anti­pyrine Schiff base and a water mol­ecule. The dihedral angles made by the pyrazoline ring with the substituted and unsubstituted phenyl rings are 14.8 (2) and 58.1 (2)°, respectively. In the crystal structure, the mol­ecules are held together by inter­molecular O—HO hydrogen bonds and weak C—HO, inter­molecular hydrogen bonds, as well as π–π stacking inter­actions.

In the title complex, [CdCl₂(C₁₅H₁₃N₅)] or [CdCl₂(tpdaH₂)] (tpdaH₂ is tripyridyldi­amine), the geometry at the five-coordinate Cd atom is distorted tetragonal pyramidal, with two Cl atoms and the three pyridine N atoms of the tripyridyldi­amine mol­ecule. The ligand (tpdaH₂) adopts an all-anti form. The observed Cd-N bond lengths are 2.2958 (19), 2.3254 (19) and 2.3067 (19) Å, slightly shorter than those in the Cd²⁺ complex with di-2-pyridyl­amine (dpa).

The title complex, [Ni(C₁₀H₈N₃O₂)₂]·CH₃OH, is a mononuclear nickel(II) compound containing two di-2-pyridyl­amine N,N'-dioxide (dpa dioxide) ligands that are nearly perpendicular to each other. The Ni^II ion of the complex has a distorted octa­hedral environment with the equatorial plane formed by an N atom from each amine group and two O atoms of one ligand, while the axial positions are occupied by two O atoms of the second ligand. In the solid state, hydrogen-bonding inter­actions are dominant, with solvent mol­ecules also participating in hydrogen bonding.

The title compound, [Sn(C₆H₅)(C₈H₇O₃)₂(C₄H₁₁Si)], was prepared by the reaction of [(CH₃)₃SiCH₂]SnPhBr₂ with CH₃OC₆H₅COOH and spasmolytol in refluxing toluene, and characterized by IR, ¹H NMR and elemental analyses. The geometry at the six-coordinate Sn^IV atom is distorted octa­hedral with the equatorial plane made up of four O atoms of two carboxyl­ate groups and the axial positions occupied by a phen­yl substituent and a trimethyl­silylmeth­yl group.

In the structure of the title compound, [Sn(C₇H₄N₂O₃)₂(C₄H₁₁Si)₂], the geometry at the six-coordinate Sn atom is distorted octa­hedral with an approximately planar equatorial belt made up of the four O atoms of two carboxyl­ate groups and the axial positions occupied by two trimethyl­silylmethyl groups.

In the title hydroxy­urea derivative, C₁₅H₁₄F₂N₂O₂, the dihedral angle between the two benzene rings is 48.64 (19)°. The urea group forms dihedral angles of 48.1 (2) and 79.2 (2)° with the two benzene rings. In the crystal, inversion dimers linked by pairs of N—HO hydrogen bonds occur, and further N—HO links lead to chains of molecules.