%0 Journal Article %1 Kaim.1993d %A Kaim, Wolfgang %A Kohlmann, Stephan %A Lees, Alistair J. %A Snoeck, Theo L. %A Stufkens, Derk J. %A Zulu, Mthembeni M. %D 1993 %J Inorganica Chimica Acta %K Raman absorption complex molybdenum pyrimidine resonance tungsten tungsten;visible %N 2 %P 159--165 %R 10.1016/S0020-1693(00)83322-8 %T Reinvestigation of the visible absorption bands of the 2,2'-bipyrimidine complexes W(CO)4(bpym) and (m-bpym)M(CO)42 (M = Mo, W) with resonance Raman spectroscopy; the emission spectrum of (m-bpym)Mo(CO)42 %V 210 %X The character of the two lowest energy transitions of W(CO)4(bpym) and (m-bpym)M(CO)42 (M = Mo, W) were established with resonance Raman spectroscopy. According to these spectra the two bands belong to MLCT transitions to different p* orbitals of the bpym ligand. Contrary to expectations it is not the first (lowest energy) but the second and more intense electronic transition which, according to the resonance Raman spectra, is directed to the lowest lying p* orbital (b2u*, LUMO) of these complexes. This interpretation explains the different band intensities and the untypically low g values of the ESR signals of corresponding anion radicals. Excitation of (m-bpym)Mo(CO)42 in CH2Cl2 at 400 nm produced a weak emission with an onset at 700 nm. According to the excitation spectrum, this emission originates from the lowest MLCT-excited state of the complex. on SciFinder(R)

@article{Kaim.1993d, abstract = {The character of the two lowest energy transitions of W(CO)4(bpym) and (\textgreek{m}-bpym)[M(CO)4]2 (M = Mo, W) were established with resonance Raman spectroscopy. According to these spectra the two bands belong to MLCT transitions to different \textgreek{p}* orbitals of the bpym ligand. Contrary to expectations it is not the first (lowest energy) but the second and more intense electronic transition which, according to the resonance Raman spectra, is directed to the lowest lying \textgreek{p}* orbital (b2u*, LUMO) of these complexes. This interpretation explains the different band intensities and the untypically low g values of the ESR signals of corresponding anion radicals. Excitation of (\textgreek{m}-bpym)[Mo(CO)4]2 in CH2Cl2 at 400 nm produced a weak emission with an onset at 700 nm. According to the excitation spectrum, this emission originates from the lowest MLCT-excited state of the complex. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Kaim, Wolfgang and Kohlmann, Stephan and Lees, Alistair J. and Snoeck, Theo L. and Stufkens, Derk J. and Zulu, Mthembeni M.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2976326277445493c635ab375b3c38e3f/huebleriac}, doi = {10.1016/S0020-1693(00)83322-8}, interhash = {cde389af54442d8d86917e81fe8c690a}, intrahash = {976326277445493c635ab375b3c38e3f}, issn = {0020-1693}, journal = {Inorganica Chimica Acta}, keywords = {Raman absorption complex molybdenum pyrimidine resonance tungsten tungsten;visible}, number = 2, pages = {159--165}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Reinvestigation of the visible absorption bands of the 2,2'-bipyrimidine complexes W(CO)4(bpym) and (\textgreek{m}-bpym)[M(CO)4]2 (M = Mo, W) with resonance Raman spectroscopy; the emission spectrum of (\textgreek{m}-bpym)[Mo(CO)4]2}, volume = 210, year = 1993 }