%0 Journal Article %1 Uhl.1995 %A Uhl, Werner %A Schuetz, Uwe %A Kaim, Wolfgang %A Waldhoer, Eberhard. %D 1995 %J Journal of Organometallic Chemistry %K anion anion;digallane anion;pi bond crystal digallane prepn radical structure structure;gallane structure;mol tetraalkyldi %N 1-2 %P 79--85 %T Tetraalkyldigallane radical anions R2Ga.bul.-GaR2- R = CH(SiMe3)2 with long one-electron p-bond %V 501 %X The electron transfer reaction of (Me3Si)2CH2Ga-GaCH(SiMe3)22 (1) with EtLi yields thin layers of dark red (almost black) crystals of the corresponding radical anion R2Ga.bul.-GaR2- (2) with Li(TMEDA)2+, Li(DME)3+ or Li(trimethyltriazinane)2+ as a counterion. EPR spectroscopic study of 2 reveals temp.-dependent 69Ga, 71Ga and 29Si hyperfine splitting with extreme line broadening. Together with the unusually large abs. values a(69,71Ga)\textgreater5.7 mT at 300 K the pronounced temp. dependence of the coupling consts. suggests a shallow energy min. for the planar structure of the Li(triazinane)2+ salt obsd. by x-ray crystallog. The Ga-Ga bond length amts. to 240.1(1) pm, which is 14 pm shorter than in neutral 1 which has a Ga-Ga single bond. on SciFinder(R)

@article{Uhl.1995, abstract = {The electron transfer reaction of [(Me3Si)2CH]2Ga-Ga[CH(SiMe3)2]2 (1) with EtLi yields thin layers of dark red (almost black) crystals of the corresponding radical anion [R2Ga.bul.-GaR2]- (2) with [Li(TMEDA)2]+, [Li(DME)3]+ or [Li(trimethyltriazinane)2]+ as a counterion. EPR spectroscopic study of 2 reveals temp.-dependent 69Ga, 71Ga and 29Si hyperfine splitting with extreme line broadening. Together with the unusually large abs. values a(69,71Ga){\textgreater}5.7 mT at 300 K the pronounced temp. dependence of the coupling consts. suggests a shallow energy min. for the planar structure of the [Li(triazinane)2]+ salt obsd. by x-ray crystallog. The Ga-Ga bond length amts. to 240.1(1) pm, which is 14 pm shorter than in neutral 1 which has a Ga-Ga single bond. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Uhl, Werner and Schuetz, Uwe and Kaim, Wolfgang and Waldhoer, Eberhard.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/28399ffd688020927f26e705d837672af/huebleriac}, interhash = {54731f61eac299b5a0c0eb4428bd4aa6}, intrahash = {8399ffd688020927f26e705d837672af}, journal = {Journal of Organometallic Chemistry}, keywords = {anion anion;digallane anion;pi bond crystal digallane prepn radical structure structure;gallane structure;mol tetraalkyldi}, number = {1-2}, pages = {79--85}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Tetraalkyldigallane radical anions [R2Ga.bul.-GaR2]- [R = CH(SiMe3)2] with long one-electron \textgreek{p}-bond}, volume = 501, year = 1995 }