多金属氧酸盐-卟啉体系三阶非线性光学性能与调控

Third-order nonlinear optical(NLO) effects and the corresponding applications of materials are very important and attracting growing interest in high-tech and scientific research field, however the NLO performance, laser damage threshhold, optical response time, structural-tailoring and modulation, as well as stability against laser and heating of the existing materials are still beyond satisfactory. In this project porphyrin and their derivatives, which contain large conjugated system and possess significant NLO effects, low dielectric constant, relatively high optical and thermal stability and easy modification characters, and polyoxometalates (POMs) which possess unique characters of structural diversity and easy modification, fine-tunable chemophysical properties, are chosen to interact with each other. Synthetic strategies and methods for the preparation of new porphyrin-POMs binary hybrids systems will be explored,developed and established. Influences of ther bonding adopted between them (covalent, ionic bonds, hydrogen bonding, Van de Walls interactions et al) and the structural types and cmposition and electronic structures on the third order NLO responses and optothermal stability of the resulting products will be investigated. Implement of this project will provide theoretical guidance and contribute substaintial material basis for practical utility of NLO materials.

三阶非线性光学(NLO)材料在信息、激光防护、医疗等方面有着重要的应用，然而现在三阶NLO材料依然在NLO性能、激光损伤阈值、光学响应时间、组合剪裁修饰以及光、热稳定性等方面存在不足。本项目拟选取具有显著NLO效应、低的介电常数、较高光热稳定性以及易修饰等特点的含有大共轭结构的卟啉及其衍生物和结构具有多样性及可修饰性、物理化学性质具有可调变性的多金属氧酸盐（POMs）为研究对象，研究反应生成新颖卟啉-POMs有机-无机杂化二元体系的合成策略和方法，考察POMs的结构类型、化学组成、电子结构性质、POMs与卟啉之间的键合方式（共价键、离子键、氢键、范德华相互作用等）等因素对卟啉的三阶NLO响应的影响、所得新物质产生的三阶NLO响应增益效果和光热稳定性能。本项目的实施将为NLO材料的实用化提供理论指导和物质基础。