Redox activity of bimetallic molybdenum and tungsten nitrosyls containing ligands based on 4-hydroxyphenylalkanols

The redox-active bimetallic complexes, [{M(NO)L<SUP>*</SUP>X}<SUB>2</SUB>Q] [L<SUP>*</SUP> = tris(3,5-dimethylpyrazolyl)borate, HB(3,5-Me<SUB>2</SUB>pyz)<SUB>3</SUB>; M = Mo, X = Cl or I; M = W, X = Cl; Q = OC<SUB>6</SUB>H<SUB>4</SUB>(CH<SUB>2</SUB>)<SUB>n</SUB>O (n = 1-3) or NHC<SUB>6</SUB>H<SUB>4</SUB>(CH<SUB>2</SUB>)<SUB>n</SUB>O (n = 2, 3)], have been prepared and characterized spectroscopically and electrochemically (cyclic voltammetry, coulometry). The electrochemical data indicate that there can be weak interactions between the two metal-based redox centres