Abstract
Abstract The electron conducting ability of the SS bridge was investigated using iron, ruthenium and osmium as metal centers and the bridging ligands 4,4′-dithiodipyridine and bis(4-pyridine)sulfide. The observed back-bonding manifestations in mononuclear complexes, (evaluated through pKa, MLCT and E°′1/2 data), the calculated comproportionation constant (Kc) for the homobinuclear species and the near-infrared (NIR) band characteristics of the homobinuclear and heterobinuclear mixed valence complexes consistently indicate a strong electron delocalization through the disulfide bridge. The available data strongly suggest a correlation between the conducting efficiency of the SS bridge and the existence of a multiply bonded L ⋯ S ⋯ S ⋯ L core.
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