metal-substituted methyl radicals of the type HR1R2M-CR3R4 are recorded and analyzed. The magnitudes of a(β-SiH) were in a range of 14-15G, while a(β-GeH) of ·CH2GeMe2H was 10.20G. These coupling constants were markedly temperature dependent, suggesting that the most stable conformation of these radicals at low temperature is one in which the β-MH bond eclipses the orbital on the metal radical site.
记录并分析了HR 1 R 2 M-CR 3 R 4类型的五个金属取代的甲基的ESR光谱。·CH 2 GeMe 2 H的a(β-SiH)的大小在14-15G的范围内,而·CH 2 GeMe 2 H的a(β-GeH)的大小为10.20G。这些耦合常数明显地与温度有关,这表明这些自由基在低温下最稳定的构象是其中β-MH键使金属自由基位点上的轨道黯然失色的构象。