紫外吸收温差光谱特性与化合物的电子跃迁类型

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

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。

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(Δ t ) accretes,peak high increases,bathochromic shift augments for UVSDT of n -σ  electron transition.The UVSDT of n -π  electron transition has two peak (one positive peak and one negative peak),when Δ t accretes,the positive peak up increases,the negative peak down increases.The UVSDT of π-π  electron transition become negative peak,when Δ t accetes,the negative peak down increases,the location of peak not moves.