STRUCTURAL AND BONDING TRENDS IN OSMIUM CARBONYL CLUSTER CHEMISTRY - METAL-METAL AND METAL-LIGAND BOND LENGTHS AND CALCULATED STRENGTHS, RELATIVE STABILITIES AND ENTHALPIES OF FORMATION OF SOME BINARY OSMIUM CARBONYLS, [OS-X(CO)(Y)]
Ak. Hughes et al., STRUCTURAL AND BONDING TRENDS IN OSMIUM CARBONYL CLUSTER CHEMISTRY - METAL-METAL AND METAL-LIGAND BOND LENGTHS AND CALCULATED STRENGTHS, RELATIVE STABILITIES AND ENTHALPIES OF FORMATION OF SOME BINARY OSMIUM CARBONYLS, [OS-X(CO)(Y)], Journal of the Chemical Society. Dalton transactions, (24), 1996, pp. 4639-4647
The metal-metal bond distances [d(M-M)] in the published structures of
the osmium carbonyl clusters [Os-3(CO)(12)], [Os-4(CO)(14)], [Os-4(CO
)(15)], [Os-4(CO)(16)], [Os-5(CO)(16)], [Os-5(CO)(18)], [Os-5(CO)(19)]
, [Os-6(CO)(18)] and [Os-7(CO)(21)] have been used to calculate bond-e
nthalpy terms E(M-M) using the relationship E(M-M) = 1.928 x 10(13) [d
(M-M)](-4.6), itself derived from published structural and enthalpy da
ta. Summation of the bond-enthalpy terms has revealed the varying effi
ciency with which these compounds use their skeletal bonding electrons
and allowed estimates to be made of their enthalpies of disruption in
to gaseous metal atoms and carbon monoxide and of their enthalpies of
formation, so providing insight into their relative stabilities. Corre
lations are noted between the metal:ligand ratios and metal-metal bond
enthalpies, and with the metal-ligand bonding as reflected in metal-c
arbon and carbon-oxygen bond lengths.