Ligand quadruply bonded dimers

Such a process was considered likely because in the quadruply bonded dimers the metal atoms have vacant coordination sites to accept the ligand atoms of X and Y, and the X-Y bond energy plus the weak 6-bond of the dimer are compensated by formation of M-X and M-Y bonds. On the further assumption that unfavorable steric crowding of ligands about the metal atoms account for the lack of addition chemistry previously observed for these dimers we sought to prepare compounds having weakly bound ligands. Dissociation in solution as in eqn. 2... [Pg.42]

However, the absorption bands irradiated correspond to ligand-metal change-transfer (LMCTT) excitation. Photolysis of the quadruply metal-metal bonded dimer, (RcjClg) in CHjCN forms monomers ... [Pg.259]

Li JR, Yakovenko AA, Lu W et al (2010) Ligand bridging-angle-driven assembly of molecular architectures based on quadruply bonded Mo-Mo dimers. J Am Chem Soc 132 17599-17610... [Pg.109]

Molybdenum(ll) dimers display a slightly larger span of metal—metal distances than the quadruply bound rhenium(lll) units. Certain ligand types can be associated with fairly specific metal—metal bond lengths in the molybdenum species. Thus molybdenum quadruple bonds differ in this respect from the... [Pg.244]

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