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Electronic origin for enhanced nonlinear optical response of complexes from tetraalkylammonium halide and carbon tetrabromide: Electrostatic potentials of intermolecular donor-acceptor dyads

机译:四烷基卤化铵和四溴化碳复合物增强非线性光学响应的​​电子起源:分子间供体-受体二元体的静电势

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摘要

Electronic origin for nonresonant enhancement of nonlinear optical response in the complexes formed from tetraalkylammonium halide and carbon tetrabromide is provided in view of electrostatic potentials of intermolecular donor (halide ion)-acceptor (CBr4). The calculated electrostatic potentials of donor-acceptor range from -4.83 to -7.70 kcal mol(-1) and show a decreasing order of [Et4Cl-center dot center dot center dot Br] > [Et4Br-center dot center dot center dot Br] congruent to [Et4I-center dot center dot center dot Br] > [Bu4Br-center dot center dot center dot Br]. The calculated second-order susceptibilities of solid complexes are in an increasing order of [NEt4Cl center dot CBr4] < [NEt4Br center dot CBr4] congruent to [NEt4I center dot CBr4] < [NBu4Br center dot CBr4 center dot C3H6O]. has been shown that the donor/acceptor dyads make the exclusive contribution to nonlinear optical response. A large size of halide or tetraalkylammonium ion results in a small electrostatic potential and large nonlinear optical response in these charge-transfer complexes. It indicates that a small supermolecular interaction will create a large nonlinear optical response, and it gives a clue to design the molecular complexes with large non-linear optical susceptibility.
机译:鉴于分子间供体(卤离子)-受体(CBr4)的静电势,提供了由四烷基卤化铵和四溴化碳形成的络合物的非共振增强非线性光学响应的​​电子来源。供体-受体的静电势的计算范围为-4.83至-7.70 kcal mol(-1),并且显示出从[Et4Cl-中心点中心点中心点Br]> [Et4Br-中心点中心点中心点Br]的降序。等于[Et4I-中心点中心点中心点Br]> [Bu4Br-中心点中心点中心点Br]。与[NEt4I中心点CBr4] <[NBu4Br中心点CBr4中心点C3H6O]一致,固体络合物的二阶磁化率的递增顺序为[NEt4Cl中心点CBr4] <[NEt4Br中心点CBr4]。已经表明,供体/受体二元组对非线性光学响应做出了唯一的贡献。在这些电荷转移络合物中,大尺寸的卤化物或四烷基铵离子导致较小的静电势和较大的非线性光学响应。这表明小的超分子相互作用将产生大的非线性光学响应,并且为设计具有大的非线性光学敏感性的分子配合物提供了线索。

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