Yunshan Zhou, E. Wang, Jun Peng
Mar 26, 1999
Citations
0
Influential Citations
121
Citations
Quality indicators
Journal
Polyhedron
Abstract
Abstract The title compounds (C 9 H 7 NO) 4 H 7 PMo 12 O 40 ·3H 2 O (I) and (phen) 3 H 7 PMo 12 O 40 ·CH 3 CN·H 2 O (II) were synthesized by reactions of C 9 H 7 NO and phen with the four-electron-reduced heteropoly blue H 7 [PMo 8 VI Mo 4 V O 40 ]·12H 2 O, respectively, and characterized by elemental analysis, TG/DTA, IR and 31 P NMR. Spectroscopic data support the view that the heteropoly blue anion in the product molecules still retain the Keggin structure, and both C 9 H 7 NO and phen are functioning as bases, i.e. they are protonated by the heteropoly blue acid. Nonlinear optical (NLO) properties of the charge-transfer complexes were studied with a 200 ps pulsed laser at 532 nm with I 0 =5.6×10 13 W/m 2 . Complexes (I) and (II) exhibit mainly optical self-defocusing with negligibly very small nonlinear absorption. The third-order NLO susceptibilities χ (3) of the two complexes are 9.6×10 −11 esu as measured with an 1.34×10 −3 mol dm −3 DMSO solution for (I) and 1.48×10 −12 esu as measured with an 8.4×10 −4 mol dm −3 DMSO solution for (II), respectively. These nonlinear optical properties of the complexes were compared with those of complexes prepared by reacting C 9 N 7 NO and phen with H 3 [PMo 12 VI O 40 ]·nH 2 O, respectively. It reveals a qualitative structure/NLO property correlation.