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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 .
(NMPH) 3PW1 2 O40 · CH3CN (I), (NMPH) 4 (NMPH) 4 with nonlinear optical properties was synthesized from N-methylpyrrolidone and HnXW1 2 O40 · mH2 O (X = P, Si, Ge) SiW1 2 O40 · CH3CN (Ⅱ) and (NMPH) 4 GeW1 2 O40 · CH3CN (Ⅲ) were synthesized and characterized by elemental analysis, infrared spectroscopy and diffuse reflectance electron spectroscopy. The results showed that the anion structure of heteropoly acid did not change after the charge - transfer salt was formed. N - methylpyrrolidone was salt formed by the combination of proton H + of the N atom and the proton H + in the acid. Charge transfer can occur between the anion and the cation under photoexcitation. The results of linear optical properties show that the multiplicative effect intensities of charge-transfer salts are I2ωⅠ = 0.6KDP, I2ωⅡ = 0.85 and I2ωⅢ = 0.41IKDP, respectively. The third order nonlinear coefficients are χ (3) Ⅰ = 1. 60 × 10-12 esu, χ (3) Ⅱ = 3.6 × 10-12 esu, χ (3) Ⅲ = 1.2 × 10-11 esu.