%0 Journal Article %1 Hasenzahl.1994 %A Hasenzahl, Steffen %A Kaim, Wolfgang %A Stahl, Thomas. %D 1994 %J Inorganica Chimica Acta %K Group aluminum bond carbon charge gallium metal organometallic organometallic;Main organometallic;heterocycle reaction transfer zinc %N 1-2 %P 23--34 %R 10.1016/0020-1693(94)04025-7 %T Charge and electron transfer from metal-to-carbon bonds of Main Group organometallics MRn (M = Al, Ga, Zn) to aromatic N-heterocycles: Colored precursor compounds and radical complex formation %V 225 %X The coordinatively unsatd. compds. AlR3, GaR3 and ZnR2, R = iso-Pr, were reacted with linearly bridging pyrazine, tetramethylpyrazine or 4,4'-bipyridine ligands and with potentially chelating 2,2'-bipyridine. The primary reaction products are diamagnetic dinuclear complexes (bis-adducts) which are characterized by intense long-wavelength ligand-to-ligand charge transfer (LLCT) transitions s(M-R)$\rightarrow$ p*(L) and which may yield radical complexes after loss of R.bul.. The latter reaction is assumed to have a strong single electron transfer (SET) component. An isolable Al(II) species (bpy)Al[CH(SiMe3)2]2 has been characterized unambiguously by ESR, UV-Vis and cyclic voltammetry as an Al(III) complex of the bpy radical anion. Irradn. into the fairly intense LLCT absorption bands (e \textgreater 3000 M-1 cm-1) of the dinuclear complexes between pyrazine and AliPr3 or GaiPr3 resulted in bleaching and formation of a mixt. of non-arom. products. Attempts are made to correlate charge transfer properties and radical formation with the geometrical and electronic structures of the precursor complexes. [on SciFinder(R)]

@article{Hasenzahl.1994, abstract = {The coordinatively unsatd. compds. AlR3, GaR3 and ZnR2, R = iso-Pr, were reacted with linearly bridging pyrazine, tetramethylpyrazine or 4,4'-bipyridine ligands and with potentially chelating 2,2'-bipyridine. The primary reaction products are diamagnetic dinuclear complexes (bis-adducts) which are characterized by intense long-wavelength ligand-to-ligand charge transfer (LLCT) transitions \textgreek{s}(M-R)$\rightarrow$ \textgreek{p}*(L) and which may yield radical complexes after loss of R.bul.. The latter reaction is assumed to have a strong single electron transfer (SET) component. An isolable Al(II) species (bpy)Al[CH(SiMe3)2]2 has been characterized unambiguously by ESR, UV-Vis and cyclic voltammetry as an Al(III) complex of the bpy radical anion. Irradn. into the fairly intense LLCT absorption bands (\textgreek{e} {\textgreater} 3000 M-1 cm-1) of the dinuclear complexes between pyrazine and AliPr3 or GaiPr3 resulted in bleaching and formation of a mixt. of non-arom. products. Attempts are made to correlate charge transfer properties and radical formation with the geometrical and electronic structures of the precursor complexes. [on SciFinder(R)]}, added-at = {2022-06-15T11:26:56.000+0200}, author = {Hasenzahl, Steffen and Kaim, Wolfgang and Stahl, Thomas.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2d9ee0f23d6424807ea65c66cfa081e4f/huebleriac}, doi = {10.1016/0020-1693(94)04025-7}, interhash = {622b62cb6c03a189b81e752e83a7e73d}, intrahash = {d9ee0f23d6424807ea65c66cfa081e4f}, issn = {0020-1693}, journal = {Inorganica Chimica Acta}, keywords = {Group aluminum bond carbon charge gallium metal organometallic organometallic;Main organometallic;heterocycle reaction transfer zinc}, number = {1-2}, pages = {23--34}, timestamp = {2022-06-15T09:26:56.000+0200}, title = {Charge and electron transfer from metal-to-carbon bonds of Main Group organometallics MRn (M = Al, Ga, Zn) to aromatic N-heterocycles: Colored precursor compounds and radical complex formation}, volume = 225, year = 1994 }