Delocalization of the imidazole electron density is observed in both structures. In the dichlorocobalt complex structure, the two crystallographically independent mercaptobenzimidazole molecules are attached together through the direct bonding of the Co(II) ion with two S atoms. The cohesion of the molecules in the crystals is due to intermolecular N-H-.-S, and; intra and intermolecular N-H.--CI hydrogen bonds, respectively.

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The structure of the title compound, bis(4H+-9 -oxo-4,5-diazafluorenium) tetrabromocadmate(II)-water (1/2), consists of a distorted tetrahedral (CdBr4) 2-anion and HL + cations, where L is the organic ligand dafone (4,5-diazafluoren-9-one). There is no direct bonding between the metal atom and the ligand. The protonation of one of the N atoms in the dafone ring system gives rise to an opening of the C--N----C angle when compared with the corresponding value in the neutral form. The dihedral angles between the mean planes of the pyridine Acta Crystallographica Section C

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The title compound [Ni(CPDD)(H2O)2]2(H 2O )2, {]Ni2(C44H28N8O12)] (H2O)2 }, where CPDD = 1H‐cyclopenta(2,1‐b:3,4‐b')(dipyridine‐2,5‐dione) has been prepared and its crystal structure determined by single crystal X‐ray diffraction at room temperature. The complex crystallizes in the triclinic space group P1 w ith two molecules in the asymmetric unit. The cell dimensions are a=10.452(1),b=14.098(1) & c=16.023 Å; D=110.13(1), E=100.63(1) & J=100.85(1)°. The two independent molecules in the asymmertic unit are related by pseudo two fold symmetry. In both the molecules the coordination environment around the Ni(II) may be best described as a distorted octahedral. Due to some delocalization of charge towards one of the oxygens(O1a) from the O2a atom some degree of bond localization has been observed. The individual diones of both the molecules are almost right angles at the metal atom. A long the y‐axis inversion related molecules are forming pseudo‐dimers through hydrogen bonding.