Intriguing Influence of −COOH-Driven Intermolecular Aggregation and Acid–Base Interactions with <i>N</i>,<i>N</i>-Dimethylformamide on the Second-Order Nonlinear-Optical Response of 5,15 Push–Pull Diarylzinc(II) Porphyrinates
作者:Alessio Orbelli Biroli、Francesca Tessore、Stefania Righetto、Alessandra Forni、Alceo Macchioni、Luca Rocchigiani、Maddalena Pizzotti、Gabriele Di Carlo
DOI:10.1021/acs.inorgchem.7b00510
日期:2017.6.5
meso-diarylzinc(II) porphyrinates, carrying one or two −COOH or −COOCH3 acceptor groups and a −OCH3 or a −N(CH3)2 donor group, show in N,N-dimethylformamide and CHCl3 solutions a negative and solvent-dependent second-order nonlinear-optical (NLO) response measured by the electric-field-induced second-harmonic generation (EFISH) technique, different from the structurally related zinc(II) porphyrinate
一系列5,15个推挽式内消旋-二芳基锌(II)卟啉,带有一个或两个-COOH或-COOCH 3受体基团和-OCH 3或-N(CH 3)2供体基团,显示在N中,N-二甲基甲酰胺和CHCl 3溶液通过电场诱导的二次谐波生成(EFISH)技术测量了负的和溶剂依赖性的二阶非线性光学(NLO)响应,与结构相关的卟啉锌(II)不同带有-N(CH 3)2供体基团和-NO 2受体组,以前仍报道溶剂依赖性但EFISH二级反应阳性。此外,当-N(CH 3)2供体基团和-COOH受体基团是空间受阻的2,12推挽式β-吡咯基取代的四芳基锌(II)卟啉的一部分时,EFISH反应为正,溶剂为-独立。为了使这些有趣的观察系列合理化,通过电子吸收和红外光谱研究以及密度泛函理论(DFT)和耦合扰动DFT理论以及1对EFISH测量进行了整合。H脉冲梯度自旋回波NMR研究表明,显着的浓度效应和溶剂性质对NLO反应的强烈影响是由