Bidentate donor ligands

Diorganozinc Compounds Bearing Bidentate Donor Ligands 333... 

Breit, B. and Seiche. W. (2003) Hydrogen bonding as a constniction element for bidentate donor ligands in homogeneous catalysis Regioselective hydroformylation of terminal alkenes, J.Ahi. Chem. Soc.. 125. 6608-6609. 

Bicyclotetraphosphines, with chromium carbonyls, 5, 221-222 Bidentate amidinates, in Zr(IV) mono-Cp complexes, 4, 827 Bidentate donor ligands, on diorganozinc compounds, 2, 333 Bidentate guanidinates, in Zr(IV) mono-Cp complexes, 4, 827 Bidentate ligands... 

The most common strategy in the synthesis of heteronuclear complexes is the use of bidentate donor ligands bearing different donor centers. In that way both donor atoms can be coordinated selectively to two different metal centers in a consecutive way. If the space between the donor atoms of the ligands is short, interactions between both metals usually appear, normally intramolecular. Sometimes, albeit not very often, the bidentate units bind to one another, leading to extended structures through metallophilic interactions. As we have commented, in the case of gold-silver derivatives the number of luminescent studies of these derivatives is very scarce. 

Hexacoordinate neutral complexes can include either two monodentate or one bidentate donor ligand. Formally, the latter is a chelate complex however, the presence of two intermolecular coordinate bonds enables one to consider such a ligand in this section. 

The bispyridine-substituted carbyne complexes 182 react with several anionic bidentate donor ligands to afford the anionic / -ketenyl complexes 183 [Eq. (149)] (149,167). The bis(pyrrole carboxaldiminato) complexes were further transformed into alkoxyacetylene complexes by methylation at the ketenyl oxygen atom. Addition of trimethylphosphine to the anionic carborane-substituted carbyne complex 184 at — 30°C gives the ketenyl complex 185 [Eq. (150)] (135). The hydroxy and methoxyacetylene complexes were obtained by further addition of HBF4 and methyl triflate. 

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