Dimeric structures, xanthate complexes

Simple Mo xanthate complexes were obtained by the reaction between Mo(II) acetate and the xanthate ligands in inert atmosphere (550, 581a). The red crystalline compounds had the stoichiometry Mo2(EtXant)4 and reacted readily with donor molecules such as tetrahydrofuran (550) pyridine, 4-picoline, and Et3As (581a). A Mo(lI)-acetate type of dimeric structure was proposed (581a) for this molecule and was confirmed by a subsequent x-ray study (550). 

The in vivo antitumor and trypanocidal effects of dimeric [Irn2(CH3COO)4(L)ra]° (L = classical organic antimalarial drugs, n= 1, 2) are reported.494 The dimeric complexes are characterized by IR spectroscopy. Further studies of monomeric Ir11 complexes, IrnL2, where L = alkyl or aryl dithiocarbamates and xanthates, reveal no clear relation between antitumor and antitrypanosomal actvities.495 Structure-activity data for the Ir11 complexes is presented. 

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