The syntheses, P-31{H-1} NMR spectra and cyclic voltammetry of trinuclear [Pd2M(mu(3)-Se)(2)(dppe)(3)](2+) {M = Ni or Pt; dppe=1,2-bis(diphenylphoshino)ethane} and pentanuclear [M '{Pd-2(mu(3)-Se)(2)(dppe)(2)}(2)](2+) (M ' =Ni, Pd or Pt) clusters with selenido bridges

Trinuclear [Pd2M(mu (3)-Se)(2)(dppe)(3)](2+) (M = Ni or Pt) and pentanuclea r [M ' {Pd-2(mu (3)-Se)(2)(dppe)(2)}(2)](2+) (M' = Ni, Pd or Pt) clusters h ave been prepared using a metalloligand [Pd-2(mu -Se)(2)(dppe)(2)] and char acterized by P-31{H-1} NMR spectroscopy and cyclic voltammetry. [Pd2Ni(mu ( 3)-Se)(2)(dppe)(3)](2+) gives two chemically reversible couples, [Pd2Pt(mu (3)-Se)(2)(dppe)(3)](2+) exhibits one chemically reversible couple and pent anuclear clusters show three couples in each cyclic voltammogram of the red uction process at 255 K. The redox behavior of the clusters is discussed. ( C) 2001 Elsevier Science B.V. All rights reserved.