TRIMETALLIC COMPLEXES CONTAINING NICKEL OR PALLADIUM AND 2 MOLYBDENUMNITROSYL GROUPS

The reaction of [Mo(NO){HB(dmpz)(3)}Cl-2][HB(dmpz)(3) = tris(3,5-dimet hylpyrazolylborate] with nickel(II) and palladium(II) Schiff-base comp lexes derived by condensation of two mole equivalents of 2,5-dihydroxy benzaldehyde with alpha,omega-diamines [1,2-C6H4(NH2), NH2(CH2)(n)NH2, n = 2-4 for Ni, n = 2 for Pd) affords trimetallic species. From cycli c, square wave and differential pulse voltammetric data it is shown th at the species may be reduced to a dianion and that the sites of reduc tion are probably the two molybdenum nitrosyl fragments. From the elec trochemical and limited EPR spectral data obtained from reduced specie s, it is clear that there is very weak electronic and minimal magnetic interaction between the redox centres. (C) 1997 Elsevier Science Ltd.