Synthesis and Structure of Fe(III) Complexes with 2,1,3-Benzothiadiazole-5,6-Dithiolate

Two new Fe (III) anionic complexes with 2, 1, 3-benzothiadiazole-5, 6-dithiolate (btdt2–) isolated as crystalline (PyH) 2Fe (btdt) 22·2C3H6O (1·2C3H6O) and (NBu4) 2Fe (btdt) 22·3THF (2·3THF) solvates are synthesized and characterized by single crystal X-ray diffraction. The anionic unit of these complexes consists of Fe (btdt) 2– moieties dimerized in Fe{ (btdt) ₂}₂^2- bridged through coordination of one sulfur atom of each of the (btdt) 2–ligands. Finally, in Fe{ (btdt) ₂}₂^2-, the iron atoms are in a square pyramidal environment of sulfur atoms. The absorption spectra of acetonitrile solutions of compounds 1 and 2 demonstrate broad bands with the maxima at 250 nm, 404 nm, 485 nm, and 606 nm covering the entire visible light region.