dynamics are predominantly governed by the homolytic dissociation energy of the +'C-H bond, although other factors such as solvent reorganization should be taken into account to a minor extent.Acknowledgment. This work has been jointly supported by the CNRS, the Office of Basic Energy Sciences of the US Department of Energy. P.H. thanks the NIST for allowing him to carry out the laser flash photolysis experiments and Dr. R. E. Huie for his help in using the laser system.

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A series of new M[(dcbdt) 2 ]−z complexes of the dicyanobenzodithiolate (dcbdt) ligand with a range of transition metals (M = Co, Pd, Pt, Cu, Au and Zn) in different oxidation states (z = 0.4, 1, 2) were prepared as their nBu 4 N salts and characterised by X-ray diffraction, cyclic voltammetry, EPR and static magnetic susceptibility. Their properties are discussed in comparison with the Ni and Fe analogues described by us recently. The structures of these complexes belong to four distinct groups: i) the Zn II compound 10 is triclinic P1 with the metal in a tetrahedral coordination geometry; ii) other M II complexes [M = Pt (8), Pd (7), Co (3) and Cu (5)] are monoclinic C2/m, and are isostructural with the Ni II analogue, presenting a perfectly planar square geometry; iii) the Co III compound 4 is triclinic P1 , and isostructural with the Fe and Ni analogues, with a strong dimerisation of the M(dcbdt) 2 units

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