%0 Journal Article %1 Ernst.1986c %A Ernst, Sylvia %A Kurth, Yvonne %A Kaim, Wolfgang. %D 1986 %J Journal of Organometallic Chemistry %K backbonding backbonding;bipyrimidine backbonding;biyridazine backbonding;chromium backbonding;molybdenum backbonding;tungsten bipyrazine complex diimine metal solvatochromism %N 2 %P 211--215 %R 10.1016/0022-328X(86)80084-5 %T Correlation between solvatochromism and back-bonding in four isomeric (a-diimine)M(CO)4 complexes (M = Cr, Mo, W) %V 302 %X Long-wavelength charge transfer absorption energies of isomeric complexes (L)M(CO)4 (L = 3,3'-bipyridazine, 2,2'- and 4,4'-bipyrimidine, 2,2'-bipyrazine; M = Cr, Mo, W) were measured in various solvents and compared with those for corresponding 2,2'-bipyridine complexes. Linear correlations of energies of absorption max. with solvent parameters EMLCT* (MLCT = metal to ligand charge transfer) revealed that the solvent dependence Du/DEMLCT* within the L series increases with decreasing abs. charge transfer transition energy in a given solvent, i.e. with increasing back-donation into the ligand p* orbital. Complexes of the most strongly back-bonding ligand, 4,4'-bipyrimidine, thus display by far the most pronounced solvent dependence, with Du/DEMLCT* 4100 cm-1 for the molybdenum system. on SciFinder(R)

@article{Ernst.1986c, abstract = {Long-wavelength charge transfer absorption energies of isomeric complexes (L)M(CO)4 (L = 3,3'-bipyridazine, 2,2'- and 4,4'-bipyrimidine, 2,2'-bipyrazine; M = Cr, Mo, W) were measured in various solvents and compared with those for corresponding 2,2'-bipyridine complexes. Linear correlations of energies of absorption max. with solvent parameters EMLCT* (MLCT = metal to ligand charge transfer) revealed that the solvent dependence \textgreek{Du}/\textgreek{D}EMLCT* within the L series increases with decreasing abs. charge transfer transition energy in a given solvent, i.e. with increasing back-donation into the ligand \textgreek{p}* orbital. Complexes of the most strongly back-bonding ligand, 4,4'-bipyrimidine, thus display by far the most pronounced solvent dependence, with \textgreek{Du}/\textgreek{D}EMLCT* 4100 cm-1 for the molybdenum system. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Ernst, Sylvia and Kurth, Yvonne and Kaim, Wolfgang.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/21b27f9eb73434bb5053eae2c37d2fece/huebleriac}, doi = {10.1016/0022-328X(86)80084-5}, interhash = {d5756cbef44e72b341e4380ca7cba75f}, intrahash = {1b27f9eb73434bb5053eae2c37d2fece}, journal = {Journal of Organometallic Chemistry}, keywords = {backbonding backbonding;bipyrimidine backbonding;biyridazine backbonding;chromium backbonding;molybdenum backbonding;tungsten bipyrazine complex diimine metal solvatochromism}, number = 2, pages = {211--215}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Correlation between solvatochromism and back-bonding in four isomeric (\textgreek{a}-diimine)M(CO)4 complexes (M = Cr, Mo, W)}, volume = 302, year = 1986 }