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A series of bridged diphosphinothioyl bidentate ligands has been synthesized and several have been found to form stable complexes with a number of "class b" metal halides. The infrared spectra indicate that the ligands form six-membered ring chelates by coordination ziia both thiophosphoryl donor sites. The sulfur-bridged ligands undergo cleavage to yield phosphorodithioate complexes.

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Die Titelliganden (IV) werden durch Reaktion der Thiophosphinylhalogenide (I) a) mit dem lithiierten Methylphosphinsulfid (II), b + c) mit Ag‐oxid oder 3m NaOH bzw. d) mit Monothio‐ oder Dithiophosphinaten (III) synthetisiert.