Abstract
Abstract A number of chalcohalide complexes of molybdenum and tungsten having the unusual composition MS2X3(SeX2) (X = Cl, Br) have been synthesized. Their structure has been studied by vibrational spectroscopy, 35Cl and 79Br NQR methods, magnetic measurements and X-ray structure analysis for the bromide compounds. The compounds are dimeric; the metal atoms (d1) in them are bonded directly by an ordinary bond and bridging S2 ligands, coordinated perpendicular to the metal-metal bond. The coordination of the SeX2 (X = Cl, Br) ligands is unusual; the selenium atom, as donor, is bonded to the metal and, as acceptor, to two bridging halogen atoms.
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