%0 Journal Article %1 Bessenbacher.1989 %A Bessenbacher, Christian %A Kaim, Wolfgang. %D 1989 %J Journal of Organometallic Chemistry %K carbonyl complex;triazanaphthalene complex;tungsten deaza deriv deriv;naphthyridine fluxionality pteridine tungsten %N 1 %P 83--103 %T Coordination ambivalence and fluxional behavior in mono- and binuclear pentacarbonyltungsten complexes of pteridine and its deaza derivatives %V 369 %X WL(CO)5 (L = pteridine (pte), 1,5-naphthyridine, (npt), 1,4,5-triazanaphthalene (tan), 1,4,6-triazanaphthalene) and W2(CO)10L1 (L1 = pt, npt) were prepd. Unambiguous identification of coordination sites was only possible by use of high-resoln. 1H NMR because the chem. shifts and spin-spin coupling consts. are characteristically affected by W(CO)5-coordination to neighboring N centers. Fluxional behavior with respect to the peri coordination sites was obsd. for W(CO)5(1,4,5-tan) and W(CO)10(pte). Competition between the more basic pyridine or pyrimidine and the better p backdonating pyrazine N centers leads to various positions for the nondegenerate equil. between linkage isomers. Cyclic voltammetry and solvent-dependent charge transfer absorption spectra of the complexes reveal low-lying p* levels which can become populated after chem. or electrochem. redn., the spin distribution in the centrosym. binuclear complex of 1,5-naphthyridine anion radical was fully characterized using ESR and results from MO calcns. on SciFinder(R)

@article{Bessenbacher.1989, abstract = {WL(CO)5 (L = pteridine (pte), 1,5-naphthyridine, (npt), 1,4,5-triazanaphthalene (tan), 1,4,6-triazanaphthalene) and W2(CO)10L1 (L1 = pt, npt) were prepd. Unambiguous identification of coordination sites was only possible by use of high-resoln. 1H NMR because the chem. shifts and spin-spin coupling consts. are characteristically affected by W(CO)5-coordination to neighboring N centers. Fluxional behavior with respect to the peri coordination sites was obsd. for W(CO)5(1,4,5-tan) and W(CO)10(pte). Competition between the more basic pyridine or pyrimidine and the better \textgreek{p} backdonating pyrazine N centers leads to various positions for the nondegenerate equil. between linkage isomers. Cyclic voltammetry and solvent-dependent charge transfer absorption spectra of the complexes reveal low-lying \textgreek{p}* levels which can become populated after chem. or electrochem. redn., the spin distribution in the centrosym. binuclear complex of 1,5-naphthyridine anion radical was fully characterized using ESR and results from MO calcns. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Bessenbacher, Christian and Kaim, Wolfgang.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2248687dc2e2486673fb2c4a8d5656820/huebleriac}, interhash = {c4ede1b93002d0a9a60a50513eec5f13}, intrahash = {248687dc2e2486673fb2c4a8d5656820}, journal = {Journal of Organometallic Chemistry}, keywords = {carbonyl complex;triazanaphthalene complex;tungsten deaza deriv deriv;naphthyridine fluxionality pteridine tungsten}, number = 1, pages = {83--103}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Coordination ambivalence and fluxional behavior in mono- and binuclear pentacarbonyltungsten complexes of pteridine and its deaza derivatives}, volume = 369, year = 1989 }