紫外吸收温差光谱特性与化合物的电子跃迁类型

用紫外吸收变温光谱差减法获得化合物的紫外吸收温差光谱（UVSDT）。测量了系列化合物的温差光谱。结果表明，UVSDT具有很强的特征性：n→σ^*电子跃迁的UVSDT单边红移，温差增大峰强度增加、红移增大；n-π^*电子跃迁的UVSDT为正、负两峰、温差增大，正负两峰各自向正、负方向增强；π-π^*电子跃迁的UVSDT为负峰，温差增大，峰强负向增大，峰位不移动。

Characteristics on Ultraviolet Absorbtion Spectrum from Difference in Temperature and Electron Transition Types of Compounds

The paper states a measuring method about Ultraviolet absorption spectrum from difference in temperature (UVSDT). The UVSDT of chemical compounds have been obtained with UV-240 ultraviolet spectrophotometer. The results show that the characteristic of UVSDT is related to electronic transition type of molecule. The long wave side shifts to long wave, when difference in temperature (delta t) accretes, peak high increases, bathochromic shift augments for UVSDT of n-sigma* electron transition. The UVSDT of n-pi* electron transition has two peak (one positive peak and one negative peak), when delta t accretes, the positive peak up increases, the negative peak down increases. The UVSDT of pi-pi* electron transition become negative peak, when delta t accretes, the negative peak down increases, the location of peak not moves.