Effect of Polar Solvents on the Absorption Frequency of n→π Electronic Transitions
Effect of Polar Solvents on the Absorption Frequency of n→π Electronic Transitions
复制标题
极性溶剂对 n→π 电子跃迁吸收频率的影响
DOI：
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发表时间：
1952
期刊：
影响因子：
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通讯作者：
H. Mcconnell
中科院分区：
文献类型：
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作者：
H. Mcconnell
各种光谱数据表明，n→π电子跃迁的吸收频率在溶剂、石蜡、酒精和水系列中逐渐增加。极性溶剂对 n→π 跃迁频率的一般影响与伴随此类跃迁的分子电荷分布的特征变化有关。在某些情况下，溶剂化效应对于区分 n→π 和 π→π 电子跃迁具有相当大的价值。有证据表明，NO3− (32,000 cm−1)、CO3= (46,000 cm−1) 和 CS3= (20,000 cm−1) 离子的吸收带是 n→π 跃迁。
A variety of spectroscopic data shows that the absorption frequencies of n→π electronic transitions progressively increase in the series of solvents, paraffin, alcohol, and water. This general effect of polar solvents on the frequency of n→π transitions is related to the characteristic change in the molecular charge distribution accompanying this type of transition. In certain cases solvation effects can be of considerable value in distinguishing between n→π and π→π electronic transitions.Evidence is presented which indicates that the absorption bands of the ions, NO3− (32,000 cm−1), CO3= (46,000 cm−1) and CS3= (20,000 cm−1) are n→π transitions.