Abstract
Reactions of the 1:2 condensate (L) of benzil dihydrazone and 1-methyl-2-imidazole carboxaldehyde with Cd(ClO 4) 2 · xH 2O and CdI 2 yield [CdL 2](ClO 4) 2 ( 1) and LCdI 2 ( 2), respectively. The yellow ligand L, and its yellow complexes 1 and 2 are characterized by NMR and single crystal X-ray diffraction. Though L contains four N-donor centers, 1 is found to be a four-coordinate double helicate with a square planar Cd(II)N 4 core and 2 a spiral coordination polymer with tetrahedral Cd(II)N 2I 2 moieties. The bidentate nature of L and the occurrence of the square planar coordination of Cd(II) is explained by DFT calculations.
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