The synthesis of a new ligand, hydrotris(methimazolyl)borate, a soft analogue of hydrotris(pyrazolyl)borate, is reported; to demonstrate the coordination chemistry of this novel ligand, complexes of CuI and ZnII are prepared and characterised

This review describes the development of the anionic soft scorpionate ligand hydrotris(methimazolyl)borate (Tm Me ), its N-alkyl and N-aryl congeners and draws comparisons where appropriate with its close relatives, the dihydrobis(methimazolyl)borates (Bm R ). Key features of the interaction of these species with metal centres, including bonding modes, elec-

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Methylarsine oxide and sulfide are more toxic to Candida humicola than arsenite; the sulfide is rapidly metabolized to trimethylarsine (Me3As) and methylarsine (MeAsH2) and the oxide to dimethylarsinic acid [Me2AsO(OH)]. Cell-free extracts of C. humicola also convert the oxide to Me2AsO(OH). The glutathione (RSH) derivative Me2AsSR is metabolized by C. humicola to Me3Asand Me2AsH, but some other Me2AsSR' compounds are unaffected. Studies involving the interaction of the arsenic(II1) compounds with natural ecosystems and other micro-organisms such as Scopulariopsis brevicaulis, Straptococcus sanguis, Escherichia coli, and Veillonella alcalescens are described.