%0 Journal Article %1 Kaim.1989 %A Kaim, Wolfgang %A Kohlmann, Stephan %A Lees, Alistair J. %A Zulu, Mthembeni. %D 1989 %J Zeitschrift fuer Anorganische und Allgemeine Chemie %K Group VIB carbonyl chalcogenadiazole chalcogenadiazole;selenadiazole chromium complex complex;Group complex;oxadiazole complex;quinoxaline complex;redn complex;thiadiazole complex;tungsten potential quinoxaline;molybdenum tungsten %P 97--114 %T 2-Heteroatom-1,3-diazoles and quinoxaline as bridging p-acceptor ligands for Group VIB metal carbonyl fragments M(CO)5 (M = Cr, Mo, W). Synthesis, electrochemistry, absorption and emission spectroscopy %V 575 %X M(CO)5L (M = Cr, Mo, W; L = 2,1,3-benzoxadiazole (bod), 2,1,3-benzothiadiazole (btd), 2,1,3-benzoselenadiazole (bsd)), M1(CO)52L1 (M1 = Cr, W; L1 = bod, btd, bsd, quinoxaline, 2,1,3-thiadiazole) were prepd. and characterized by cyclic voltammetry, UV-visible adsorption and emission spectroscopy. The complexes exhibit low-lying metal-to-ligand charge transfer (MLCT, d $\rightarrow$ p*) transitions as evident from long wavelength absorptions and are easily reduced to yield persistent anion radicals. W(CO)52L1 (L1 = btd, bsd) show weak near IR (\textgreater750 nm) emission from rather short-lived MLCT excited states. While quinoxaline and monocyclic 2,1,3-thiadiazole also form binuclear W(CO)5 complexes, the related 2-methyl-1,2,3-benzotriazole does not bind W(CO)5 fragments in the neutral state but only as the more basic anion radical as evident from ESR spectroscopy. on SciFinder(R)

@article{Kaim.1989, abstract = {M(CO)5L (M = Cr, Mo, W; L = 2,1,3-benzoxadiazole (bod), 2,1,3-benzothiadiazole (btd), 2,1,3-benzoselenadiazole (bsd)), [M1(CO)5]2L1 (M1 = Cr, W; L1 = bod, btd, bsd, quinoxaline, 2,1,3-thiadiazole) were prepd. and characterized by cyclic voltammetry, UV-visible adsorption and emission spectroscopy. The complexes exhibit low-lying metal-to-ligand charge transfer (MLCT, d $\rightarrow$ \textgreek{p}*) transitions as evident from long wavelength absorptions and are easily reduced to yield persistent anion radicals. [W(CO)5]2L1 (L1 = btd, bsd) show weak near IR ({\textgreater}750 nm) emission from rather short-lived MLCT excited states. While quinoxaline and monocyclic 2,1,3-thiadiazole also form binuclear W(CO)5 complexes, the related 2-methyl-1,2,3-benzotriazole does not bind W(CO)5 fragments in the neutral state but only as the more basic anion radical as evident from ESR spectroscopy. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Kaim, Wolfgang and Kohlmann, Stephan and Lees, Alistair J. and Zulu, Mthembeni.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2f4d1a9bb83f927f31ed652370f78e63e/huebleriac}, interhash = {a0e5ceb623890f399b7b52fdfe7371e9}, intrahash = {f4d1a9bb83f927f31ed652370f78e63e}, issn = {0044-2313}, journal = {Zeitschrift fuer Anorganische und Allgemeine Chemie}, keywords = {Group VIB carbonyl chalcogenadiazole chalcogenadiazole;selenadiazole chromium complex complex;Group complex;oxadiazole complex;quinoxaline complex;redn complex;thiadiazole complex;tungsten potential quinoxaline;molybdenum tungsten}, pages = {97--114}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {2-Heteroatom-1,3-diazoles and quinoxaline as bridging \textgreek{p}-acceptor ligands for Group VIB metal carbonyl fragments M(CO)5 (M = Cr, Mo, W). Synthesis, electrochemistry, absorption and emission spectroscopy}, volume = 575, year = 1989 }