CAJ | 학술논문

设计并合成了一系列含不同末端给电子基团及共轭链长度的1,1-二腈基-2,2-二苯基乙烯类化合物(D1-D7),用核磁共振氢谱(1H NMR)、核磁共振碳谱(13C NMR)和高分辨质谱(HRMS)对分子结构进行了表征。选用N,N-二甲基甲酰胺(DMF)为溶剂,测定了它们的线性光物理性质,用光漂白法研究了它们的光稳定性,用热失重法测试了它们的热稳定性。研究了这7个化合物针对800 nm脉冲激光(掺钛蓝宝石激光器,脉冲宽度~130 fs,重复频率1000 Hz)的光限幅性质。结果表明：以二烷基氨基为给电子基团的4个化合物(D4-D7)对800 nm的飞秒脉冲激光均具有显著的光限幅性能,限幅机制为双光子吸收(2PA),而端基给电子能力较弱、共轭链长较短的D1-D3光限幅效果并不明显。此外, D4-D7都具有较好的热稳定性和光稳定性。而且,该系列化合物的双光子吸收截面、光稳定性和热稳定性都具有随分子结构中给电子基团增强或共轭链增长而增大或提高的趋势。 D7具有最好的综合性能,是一个有应用潜力的光限幅材料。
설계병합성료일계렬함불동말단급전자기단급공액련장도적1,1-이정기-2,2-이분기을희류화합물(D1-D7),용핵자공진경보(1H NMR)、핵자공진탄보(13C NMR)화고분변질보(HRMS)대분자결구진행료표정。선용N,N-이갑기갑선알(DMF)위용제,측정료타문적선성광물이성질,용광표백법연구료타문적광은정성,용열실중법측시료타문적열은정성。연구료저7개화합물침대800 nm맥충격광(참태람보석격광기,맥충관도~130 fs,중복빈솔1000 Hz)적광한폭성질。결과표명：이이완기안기위급전자기단적4개화합물(D4-D7)대800 nm적비초맥충격광균구유현저적광한폭성능,한폭궤제위쌍광자흡수(2PA),이단기급전자능력교약、공액련장교단적D1-D3광한폭효과병불명현。차외, D4-D7도구유교호적열은정성화광은정성。이차,해계렬화합물적쌍광자흡수절면、광은정성화열은정성도구유수분자결구중급전자기단증강혹공액련증장이증대혹제고적추세。 D7구유최호적종합성능,시일개유응용잠력적광한폭재료。
A series of malononitrile derivatives (D1-D7) with different electron donors and conjugation lengths were designed and synthesized. Their structures were characterized using 1H and 13C nuclear magnetic resonance (NMR) spectroscopies, and high-resolution mass spectrometry (HRMS). Their linear photophysical properties were investigated in dimethylformamide (DMF) solutions, their optical stabilities were investigated using photobleaching experiments, and their thermal stabilities were determined using thermogravimetric analysis (TGA). The optical limiting behaviors of D1-D7 under an 800 nm femtosecond pulsed laser (Ti:sapphire laser, ~130 fs, 1000 Hz) were investigated. The results showed that four of the compounds (D4-D7), which had dialkylamines as electron donors, exhibited significant optical limiting behaviors, based on two-photon absorption (2PA), but the other three compounds (D1- D3), which had either weak donors or short conjugation lengths, showed very weak optical limiting behaviors. Al the compounds had good photochemical and thermal stabilities. The 2PA cross-sections and optothermal stabilities of this series of compounds increased with increasing conjugation length or electron-donating ability of the alkylamine groups in their structures. D7, which had the best properties, is a potential candidate for optical limiting applications under an 800 nm femtosecond pulsed laser.