Five metal-bridged biferrocene complexes of the Schiff-base ligand (HL=S-benzyl-N-(ferrocenyl-1-methyl-methylidene)dithiocarbazate) have been studied by single crystal X-ray diffraction and (57)Fe Mossbauer spectroscopy. The crystal structures of the complexes show that the central metal ions are tetra-coordinated by two ligands in two modes: the central d(8) transition metal ions (Ni(2+), Pd(2+), and Pt(2+)) are nearly square-planar coordinated and the d(10) transition metal ions (Zn(2+) and Cd(2+)) are tetrahedrally coordinated. Interestingly, the isomer shifts in (57)Fe Mossbauer spectroscopy are also of two kinds: d(8) transition metal ions (0.097-0.247 mm/s) and d(10) transition metal ions (0.416-0.435 mm/s). (C) 2010 Elsevier Ltd. All rights reserved.