%0 Journal Article %1 Roy.2009b %A Roy, Sayak %A Sarkar, Biprajit %A Duboc, Carole %A Fiedler, Jan %A Sarper, Orkan %A Lissner, Falk %A Mobin, Shaikh M. %A Lahiri, Goutam Kumar %A Kaim, Wolfgang. %D 2009 %J Chemistry - A European Journal %K EPR;reversible MO couple;trisferrocenylcopper crystal deriv energy ferrocene ferrocenium hexaazatrinaphthylene level ligand mol oxidn prepn redn spectroelectrochem structure;unsubstituted tetrafluoroborate trisferrocenylcopper %N 28 %P 6932-6939, S6932/1-S6932/7 %R 10.1002/chem.200802655 %T Heterohexanuclear (Cu3Fe3) Complexes of Substituted Hexaazatrinaphthylene (HATN) Ligands: Twofold BF4- Association in the Solid and Stepwise Oxidation (3e) or Reduction (2e) to Spectroelectrochemically Characterized Species %V 15 %X New tris(ferrocenylcopper) compds. (m3-dqp)Cu(dppf)3X3 dppf = 1,1'-bis(diphenylphosphinoferrocene); dqp = hexamethyl-, hexachloro- or unsubstituted diquinoxalino2,3-a:2',3'-cphenazine = hexaazatrinaphthylene (HATN); X- = BF4- or PF6- undergo at least two different, reversible one-electron redns. and three very closely spaced one-electron oxidns. While the latter are attributed to the stepwise ferrocene ferrocenium conversions, the first electron addn. occurs in the ligand bridge to yield EPR detectable radical complexes. X-band EPR measurements at 9.5 GHz showed a partially resolved hyperfine structure, while high-frequency EPR measurements at 95 or 115 GHz revealed a small but variable axial g tensor anisotropy. All reversible steps were investigated by optically transparent thin-layer electrode (OTTLE) spectroelectrochem. (UV/Vis/NIR regions), revealing very low energy transitions for the reduced forms in agreement with the frontier MO arrangement. A crystal structure of the compd. with unsubstituted dqp shows notable deviation from the trigonal symmetry and the close assocn. of two tetrafluoroborate anions with the complex trication along the quasi-trigonal axis to yield (m3-dqp)Cu(dppf)3(BF4)2BF4. on SciFinder(R)

@article{Roy.2009b, abstract = {New tris(ferrocenylcopper) compds. [(\textgreek{m}3-dqp){Cu(dppf)}3][X]3 [dppf = 1,1'-bis(diphenylphosphinoferrocene); dqp = hexamethyl-, hexachloro- or unsubstituted diquinoxalino[2,3-a:2',3'-c]phenazine = hexaazatrinaphthylene (HATN); X- = BF4- or PF6-] undergo at least two different, reversible one-electron redns. and three very closely spaced one-electron oxidns. While the latter are attributed to the stepwise ferrocene ferrocenium conversions, the first electron addn. occurs in the ligand bridge to yield EPR detectable radical complexes. X-band EPR measurements at 9.5 GHz showed a partially resolved hyperfine structure, while high-frequency EPR measurements at 95 or 115 GHz revealed a small but variable axial g tensor anisotropy. All reversible steps were investigated by optically transparent thin-layer electrode (OTTLE) spectroelectrochem. (UV/Vis/NIR regions), revealing very low energy transitions for the reduced forms in agreement with the frontier MO arrangement. A crystal structure of the compd. with unsubstituted dqp shows notable deviation from the trigonal symmetry and the close assocn. of two tetrafluoroborate anions with the complex trication along the quasi-trigonal axis to yield [(\textgreek{m}3-dqp){Cu(dppf)}3(BF4)2]BF4. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Roy, Sayak and Sarkar, Biprajit and Duboc, Carole and Fiedler, Jan and Sarper, Orkan and Lissner, Falk and Mobin, Shaikh M. and Lahiri, Goutam Kumar and Kaim, Wolfgang.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2f6317149ce5fbdba347b4fcef5be88bb/huebleriac}, doi = {10.1002/chem.200802655}, interhash = {f1209036cfb4de9e0421f935496d5564}, intrahash = {f6317149ce5fbdba347b4fcef5be88bb}, issn = {0947-6539}, journal = {Chemistry - A European Journal}, keywords = {EPR;reversible MO couple;trisferrocenylcopper crystal deriv energy ferrocene ferrocenium hexaazatrinaphthylene level ligand mol oxidn prepn redn spectroelectrochem structure;unsubstituted tetrafluoroborate trisferrocenylcopper}, number = 28, pages = {6932-6939, S6932/1-S6932/7}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Heterohexanuclear (Cu3Fe3) Complexes of Substituted Hexaazatrinaphthylene (HATN) Ligands: Twofold BF4- Association in the Solid and Stepwise Oxidation (3e) or Reduction (2e) to Spectroelectrochemically Characterized Species}, volume = 15, year = 2009 }