Syntheses and crystal structures of the potential tridentate ligand formed from condensation of ferrocenoylacetone and S-benzyldithiocarbazate and its bivalent metal complexes

A new potential tridentate ligand (H<f>2</f>L) was synthesized from condensation of ferrocenoylacetone (C<f>5</f>H<f>5</f>FeC<f>5</f>H<f>4</f>C(O)CH<f>2</f>C(O)CH<f>3</f>) with S-benzyldithiocarbazate in refluxing benzene. Reaction of the ligand (H<f>2</f>L) with a bivalent metal salt (M(OAc)<f>2</f> <f>·</f> xH<f>2</f>O, M=Cu, Ni, Mn, Hg, Zn; SnCl<f>2</f> <f>·</f> 2H<f>2</f>O) afforded the corresponding bivalent metal complexes M(HL)<f>2</f> (I, M=Cu; II, M=Ni; III, M=Mn; IV, M=Hg; V, M=Zn; VI, M=Sn). All the new compounds have been characterized by elemental analyses, 1H NMR, IR and UV spectroscopies. A single-crystal X-ray analysis indicates that the ligand exists as a single iminone and not a tautomeric mixture of the iminone and enaminone. Crystallography of complex VI shows that the ligand acts as monoanionic tridentate coordinated to the tin atom via the carbonyl oxygen, deprotonated enamine nitrogen and thione sulfur atoms and the coordination geometry of the central metal is a distorted octahedron. [Copyright &y& Elsevier]