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

Treatment of dicyandiamide, 2-aminoethanethiol hydrochloride, and NiCl 2 ·6H 2 O in water gave an S-bridged dinickel(II) complex, [Ni 2 (L) 2] Cl 2 (II]Cl 2 ), 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]Cl 6 ), which has the first example of a hexol S-bridged structure, was obtained by the stepwise reaction of [1]Cl 2 with Na 4 edta and CoCl 2 ·6H 2 O in water.