Abstract
The complexes [Mo{HB(Me2pz)3}(NO)X(NHR′)](X = I, R′=o-C6H4Me, 2,5-Me2C6H3, CHPh2, p-C6H4CN, p-C6H4N2Ph, p-C6H4N2C6H4NO2-p; XCl, R′=p-C6H4I), [W{HB(Me2pz)3}(NO)Cl(NHR′)](R′= CHPh2 or p-C6H4I), [Mo{HB(Me2pz)3}(NO)I(OR)](R = CH2CH2CH2Br, p-CH2C6H4Br, or p-C6H4CN), and [W{HB(Me2pz)3}(NO)Cl(OR)](R = Ph, CH2CH2CH2Br, or p-CH2C6H4-Br)(Me2pz = 3,5- dimethylpyrazolyl) have been prepared and characterised spectroscopically. Electrochemical studies (cyclic voltammetry, coulometry) of these complexes in acetonitrile established that all underwent at least one one-electron reduction process, some of which were reversible. The E1/2 values for the reduction were dependent on the nature of the metal, the halide, and the NHR′ or OR group. The structure of [Mo{HB(Me2pz)3}(NO)I(OCH2CH2CH2Br)] was determined crystallographically. The six-co-ordinate nature of the complex was confirmed and the Mo–O bond distance was 1.89 A, comparable to that in other related compounds.
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