Enhanced second harmonic generation on passing from a mono- to a dicopper(II) bis(salicylaldiminato) Schiff base complex

被引：58
作者：
Averseng, F
Lacroix, PG
Malfant, I
Périssé, N
Lepetit, C
Nakatani, K
机构：
[1] CNRS, Chim Coordinat Lab, F-31077 Toulouse, France
[2] Ecole Normale Super, UMR 8531, PPSM, F-94235 Cachan, France
来源：
INORGANIC CHEMISTRY | 2001年 / 40卷 / 15期
关键词：
D O I：
10.1021/ic0013429
中图分类号：
O61 [无机化学];
学科分类号：
070301 ; 081704 ;
摘要：
A new ligand (H2LOH) obtained from the Schiff base condensation of 4-(diethylamino)salicylaldehyde with 1,3-diamino-2-propanol is reported, which yields two different copper(II) complexes: CuLOH and Cu2LO(AcO). Crystal data are as follows. CuLOH . EtOH: monoclinic, P2(1)/n, a = 17.810(2) Angstrom, b = 8.515(1) Angstrom, c = 18.912(2) Angstrom, beta = 112.72(1)degrees Z = 4. Cu2LO(AcO). (1)/2H(2)O: monoclinic, P2(1)/c a = 21.407(4) Angstrom, b = 15.308(2) Angstrom, c = 20.156(3) Angstrom, beta = 116.83(2)degrees Z = 4. Cu2LO(AcO). (1)/(2) H2O is antiferromagnetically coupled with J = -207.7 cm(-1) (J being the parameter of the exchange Hamiltonian H := -J S-A.S-B). CuLOH and Cu2LO(AcO) exhibit cm good transparencies in the visible frequency range with absorption maxima at 353 and 372 nm, respectively. An enhancement of 83% of the quadratic hyperpolarizability (beta) is observed by the electric field induced second harmonic (EFISH) technique on passing from the mono- to the dinuclear species. Qualitative ZINDO/SCI quantum-chemical predictions give a satisfactory account for this enhance:ment. The spin dependence of the NLO response of Cu2LO(AcO). (1)/2H2O is found to be negligible within the framework of the DFT theory.
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页码：3797 / 3804
页数：8
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