摘要
由 N-甲基吡咯烷酮 (NMP)和 Hn XMo1 2 O40 · m H2 O(X=P,Si,Ge)合成了具有非线性光学性质的电荷转移盐 ,(NMPH ) 3PMo1 2 O40 · CH3CN ( ) ,(NMPH) 4Si Mo1 2 O40 · CH3CN ( )和(NMPH) 4Ge Mo1 2 O40 · CH3CN( ) ,并以元素分析 ,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 ,在高压汞灯照射下阴阳离子之间可以发生电荷转变 .非线性光学性质研究表明 ,电荷转移盐的倍频效应强度分别为 I2ω =0 .3IKDP,I2ω =0和 I2ω =0 .0 2 IKDP,三阶非线性系数分别为χ( 3) =5 .0× 10 - 1 4 esu,χ( 3) =3.1× 10 - 1 3esu和χ( 3) =4.3× 10 - 1
The charge transfer salts, (NMPH) 3PMo 12 O 40 ·CH 3CN(Ⅰ), (NMPH) 4SiMo 12 O 40 · CH 3CN(Ⅱ) and (NMPH) 4GeMo 12 O 40 ·CH 3CN(Ⅲ), having second order nonlinear optical property were synthesized from N methylpyrrolidone(NMP) and H nXMo 12 O 40 ·mH 2O(X=P,Si,Ge) via recrystallization in methylcyanide, and characterized by elemental analysis, IR, and reflectance spectroscopy. The results indicate that the anions of the heteropoly acids remain unchanged in charge transfer salt formation. The salts are formed through combination of the N atoms of NMP with the H + of the acids. Charge transfer between the anions and cations occurs under irradiation of high voltage mercury lamp. The nonlinear optical property measurements indicate the second harmonic generation intensity of the three charge transfer salts:I 2ω Ⅰ=0 3I KDP ,I 2ω Ⅱ=0 and I 2ω Ⅲ=0 02I KDP , respectively, and the third order susceptibility of the three charge transfer salts: χ (3) Ⅰ=5 0×10 -14 esu,χ (3) Ⅱ=3 1×10 -13 esu and χ (3) Ⅲ=4 3×10 -13 esu, respectively.
出处
《应用化学》
CSCD
北大核心
2000年第2期134-137,共4页
Chinese Journal of Applied Chemistry
基金
国家自然科学基金! ( 2 960 10 0 2 )
河南省自然科学基金
河南省教委自然科学基金资助项目
