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AzidocopperII and copperI complexes of 1alkyl2[othioalkylphenylazo]imidazole SRaaiNR′ have been prepared and studied. Complex 2[CuSRaaiNR′μ1,1N3N3]2dimerises via endtoend μ1,3N3to form a tetrameric structure. AzidocopperI complexes of the ligands are obtained as MeOHbridged dimers, [CuSRaaiNR′N3μOHMe]23. The electronic spectra suggest that a small reorganisation energy 0.08 eV is associated with the change in electronic configuration, structure and oxidation state from CuIIto CuI. Redox interconversion, CuII↔ CuI, [CuSMeaaiNMeμN3N3]22a ↔ [CuSMeaaiNMeN3μOHCH3]23a, has been performed in one case. The tetranuclear complex shows ferromagnetic and antiferromagnetic interactions. The spectra, redox chemistry and magnetism are explained by DFT studies.

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A flip-flop extended water structure assists the formation of sulfate anion helices (both left- and right-handed) in a crystalline hydrate of a simple organic–inorganic compound [C6H10N2]SO4·1.5H2O (1).

An aqueous solution containing ferric chloride, acetic acid and 2-hydroxypyridine results in the solid-state isolation of an unusual mixed-ligand trinuclear iron(iii) complex [Fe₃(μ₃-O)(μ₂-CH₃COO)₆(C₅H₅NO)₂(H₂O)]ClO₄·4H₂O, 1, where the iron-coordinated water ligand forms a hydrogen-bonded water tetramer with three other solvent water molecules; the Fe₃ clusters aggregate to {Fe₃}_n via N–H⋯O type hydrogen bonds, forming a zig-zag chainlike structure.