On the Affinity between Fullerenes and Deltahedral Zintl Ions: A UV/Vis Spectroscopic Investigation. Issue 21 (16th August 2018) - Frischhut, Sabine
Abstract : The close relationship of C60 and deltahedral tetrel element cluster anions has been pointed out before. We report herein on UV/Vis spectra of the Zintl anions and compounds [Ge9 ] 2–, [(CH2 =CH)2 Ge9 ] 2–, [{(Me3 Si)3 Si}3 Ge9 ] –, {(Me3 Si)3 Si}3 Ge9 CH2 CH3, {(Me3 Si)3 Si}3 Ge9 (CH2 )2 CH3, {(Me3 Si)3 Si}3 Ge9 (CH2 )3 CH=CH2, and [{(Me3 Si)3 Si}3 Ge9 CH2 CH3 ]Pt(PPh3 ). The spectra are compared to those of the C60 fullerene, which were recorded under the same conditions. The UV/Vis spectrum of pristine [Ge9 ] 2– resembles that of C60 and at higher concentration hint at the known trimeric [(Ge9 )3 ] 6– . The influence of ligand substitution at the Ge9 cluster‐core is highlighted. For this, the synthesis of the specifically functionalized deltahedral Ge9 clusters {(Me3 Si)3 Si}3 Ge9 (CH2 )2 CH3, {(Me3 Si)3 Si}3 Ge9 (CH2 )2 CH=CH2, and {(Me3 Si)3 Si}3 Ge9 (CH2 )3 C6 H5 are reported for the first time and is achieved by the reaction of K[{(Me3 Si)3 Si}3 Ge9 ] with the respective alkyl halides in acetonitrile. The newly synthesized products were characterized by NMR spectroscopy. Abstract :