摘要
由N -甲基吡咯烷酮和HnXW1 2 O40 ·mH2 O(X =P ,Si,Ge)合成了具有非线性光学性质的电荷转移盐 ,(NMPH) 3PW1 2 O40 ·CH3CN(I) ,(NMPH) 4 SiW1 2 O40 ·CH3CN(Ⅱ )和 (NMPH) 4 GeW1 2 O40 ·CH3CN(Ⅲ ) .并由元素分析 ,红外光谱 ,漫反射电子光谱进行了表征。结果表明杂多酸形成电荷转移盐后其阴离子结构未变 ;N -甲基吡咯烷酮通过N原子与酸中的质子H+结合成阳离子而成盐 ,光激发下阴阳离子之间可以发生电荷转移 ,非线性光学性性质研究表明 ,电荷转移盐的倍频效应强度分别为I2ωⅠ =0 .6IKDP,I2ωⅡ =0 .85和I2ωⅢ =0 .41IKDP,三阶非线性系数分别为 χ(3)Ⅰ =1 .60× 1 0 - 1 2 esu ,χ(3)Ⅱ =3.6× 1 0 - 1 2 esu ,χ(3)Ⅲ =1 .2× 1 0 - 1 1 esu .
The charge transfer salts,(NMPH) 3PW 12 O 40 ·CH 3CN,(NMPH) 4SiW 12 O 40 ·CH 3CN and (NMPH) 4GeW 12 O 40 ·CH 3CN,which have the second_order nonlinear optical properties,were synthesized from N _methylpyrrolindone and H n XW 12 O 40 · m H 2O(X=P,Si,Ge),and characterized by elemental analysis,IR spectra and UV spectra.The results indicate that the anion of the heteropoly acids has not been changed after the charge transfer salts aer formed.The salts were formed by the N _methylprolindone formed the ion first based on the combination of the N atoms in the organic molecules and the H + of the acids.The charge can be transferred between the anion and the cation under irradiation of sunlight and result in the oxidation of the cation and the reduction of the anion.The data of nonlinear optical properties indicate that the second har monic generation intensity of the three charge transfer salts are I 2ω Ⅰ=0.6I KDP , I 2ω Ⅱ=0.85 and I 2ω Ⅲ=0 41I KDP ,respectively,the third order susceptibility of the three charge transfer salts are χ (3) Ⅰ=1.60×10 -12 esu, χ (3) Ⅱ=3.6×10 -12 esu and χ (3) Ⅲ=1.2×10 -11 esu respectively.
出处
《化学研究》
CAS
2000年第2期14-16,27,共4页
Chemical Research
基金
国家自然科学基金!资助项目 ( 2 960 1 0 0 2 )
河南省自然科学基金! ( 974 0 4 1 90 0 )
河南省教委自然科学基金!资助项目 ( 961
