DETERMINATION OF THE SINGLET-TRIPLET ENERGY SEPARATION FOR C602- IN DMSO BY ELECTRON PARAMAGNETIC RESONANCE
DETERMINATION OF THE SINGLET-TRIPLET ENERGY SEPARATION FOR C602- IN DMSO BY ELECTRON PARAMAGNETIC RESONANCE
复制标题
电子顺磁共振法测定DMSO中C602-的单线态-三线态能量分离
DOI：
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发表时间：
1995
期刊：
影响因子：
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通讯作者：
S. Eaton
中科院分区：
文献类型：
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作者：
P. Trulove;R. T. Carlin;G. Eaton;S. Eaton
在DMSO（二甲基亚砜）中电化学生成的C{sub 60}{sup 2-}的原位近红外（NIR）光谱表明87 {+-} 10%转化为C{sub 60}{sup 2-}。在106 K的EPR谱中，峰-峰线宽为2 G的单线叠加在分裂为11和30 G的信号上，这与文献中报道的谱相似。尖锐的EPR信号的低强度与C{sub 60}{sup 2-}的基态或在4.5和200 K之间基态-激发态分离小于kT的激发态的归属不一致。一个宽的信号，以前没有报道过，并增加了强度与温度高于135 K的增加被分配到一个激发的三重态与600 {+-} 100 cm{sup-1}的单重-三重分裂。信号的绝对强度与提出的单重态-三重态分裂一致。该信号的30-G线宽对应于2ns的寿命，其被暂时指定为三重激发态的寿命。参考文献48篇，图7。
In situ near-IR (NIR) spectra for C{sub 60}{sup 2-} generated electrochemically in DMSO (dimethyl sulfoxide) indicate 87 {+-} 10% conversion to C{sub 60}{sup 2-}. In the EPR spectra at 106 K a single line with 2-G peak-to-peak linewidth is superimposed on signals with splittings of 11 and 30 G, which is similar to spectra reported in the literature. The low intensity of the sharp EPR signals is inconsistent with assignment to the ground state of C{sub 60}{sup 2-} or to an excited state with ground-excited state separation less than kT between 4.5 and 200 K. A broad signal that has not been reported previously and increased in intensity with increasing temperature above 135 K is assigned to an excited triplet state with a singlet-triplet splitting of 600 {+-} 100 cm{sup -1}. The absolute intensity of the signal is consistent with the proposed singlet-triplet splitting. The 30-G line width of this signal corresponds to a lifetime of 2 ns, which is tentatively assigned as the lifetime of the triplet excited state. 48 refs., 7 figs.