Reparameterized Herschbach-Laurie empirical relationships between metal-metal distances and force constants applied to homonuclear bi- and polynuclear complexes (M=Cr, Mo, Rh, Pd, Ag, W, Re, Ir, Pt, Au, Hg)

This review will examine the accumulated structural and spectroscopic data, and particularly the metal-metal distances and the metal-metal frequencies, for various binuclear complexes, and occasionally other polynuclear clusters, in order to design reparameterized Herschbach-Laurie relationships (H-L) applicable to Cr, Mo, W, Re and Ir. This review will also compare these H-L equations (r(M(2)) = -b In F(M(2)) + a, where F(M(2)) is the M(2) force constant) with those that are already published on Rh, Pd, Pt, Ag, Au and Hg, and present some applications. Attempts to correlate the R-L parameters (slopes and intercepts) with the dissociation energy of the dinucIear ''naked'' dimer (M(2)(g)) and the atomic radii are made, and, finally, interesting observations are presented regarding the design of relationships for heteronuclear systems. In these cases, the slopes and intercepts are taken as simple averages of those of the homonuclear designed equations. The agreements between the calculated and the experimental F(M(2)) are particularly good.