Synthesis and characterization of new fluorescent two-photon absorption chromophores
作者:Ping-Hsin Huang、Jiun-Yi Shen、Shin-Chien Pu、Yuh-Sheng Wen、Jiann T. Lin、Pi-Tai Chou、Ming-Chang P. Yeh
DOI:10.1039/b512524c
日期:——
A series of dipolar and quadrupolar type two-photon absorption (TPA) compounds has been synthesized and TPA cross sections (σ) were measured by Ti∶sapphire femtosecond laser excitation fluorescence (λ = 800 nm). Among them, the compound [2,5-bis-[5-(4-diphenylaminophenylethynyl)thiophen-2-yl]-[1,3,4]oxadiazole], 12, has been structurally characterized by X-ray crystallography. The resulting data indicate that the structure of this compound possesses excellent coplanarity. The compounds have arylamines as the donor, and [1,3,4]oxadiazolyl, cyanovinyl or pyridazin-3,6-diyl moiety as the acceptor. Variation of arylamines and pendant alkyl groups was found to have a significant influence on σ values. By an appropriate combination of donor and acceptor, σ values of >103 GM (10−50 cm4s photon·molecule−1) can be achieved. One quadrupolar molecule (13) possessing an arylamine donor and a pyridazine acceptor has both a high σ value (1442 GM) and σ/MW (1.97 GM/g).
合成了一系列双极和四极型的双光子吸收(TPA)化合物,并通过钛蓝宝石飞秒激光激发荧光(λ = 800 nm)测量了TPA横截面(σ)。其中,化合物[2,5-bis-[5-(4-二苯基氨基苯乙炔)噻吩-2-基]-[1,3,4]噁二唑](12)已通过X射线晶体学进行结构表征。结果数据表明,该化合物的结构具有优异的共面性。这些化合物的供体为芳胺,而受体为[1,3,4]噁二唑基、氰乙烯基或吡唑吡啶-3,6-二烯基。发现芳胺和侧链烷基的变化对σ值有显著影响。通过合适的供体和受体组合,可以实现>103 GM (10−50 cm4s photon·molecule−1)的σ值。一种具有芳胺供体和吡唑受体的四极分子(13)具有高σ值(1442 GM)和σ/MW(1.97 GM/g)。