A Novel Tridentate-N,N,S Iminothiolate Ligand That Leads to the Formation of S-Bridged Dinickel(II) and Tetracobalt(III) Structures

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Abstract Treatment of dicyandiamide, 2-aminoethanethiol hydrochloride, and NiCl2·6H2O in water gave an S-bridged dinickel(II) complex, [Ni2(L)2]Cl2 ([1]Cl2), which contains novel tridentate-N,N,S iminothiolate ligands with a biguanide moiety (L−). Another S-bridged complex containing L−, [Co{Co(L)2}3]6+ ([2]Cl6), which has the first example of a hexol S-bridged structure, was obtained by the stepwise reaction of [1]Cl2 with Na4edta and CoCl2·6H2O in water.