Solvatochromism of novel donor-π-acceptor type pyridinium dyes in halogenated and non-halogenated solvents
Solvatochromism of novel donor-π-acceptor type pyridinium dyes in halogenated and non-halogenated solvents
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DOI：
10.1039/b9nj00332k
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发表时间：
2009-01-01
影响因子：
3.3
通讯作者：
Harima, Yutaka
中科院分区：
文献类型：
--
作者：
Ooyama, Yousuke;Asada, Risa;Harima, Yutaka
新合成的给体-受体型吡啶染料随着溶剂介电常数（epsilon(r)）的减小，其吸收带发生了色移（负溶剂变色），且在类似epsilon(r)值的情况下，卤代溶剂中的色移要大于非卤代溶剂中的色移。基于H-1 NMR测量、半经验分子计算（利用SCRF Onsager模型进行AM1和INDO/S计算）以及浸在溶剂中的染料吸附在纳米晶TiO2薄膜上的吸收光谱测量，研究了卤化溶剂对大色移的影响。
Donor-pi-acceptor type pyridinium dyes that have been newly synthesized showed bathochromic shift of the absorption band with decreasing dielectric constant (epsilon(r)) of solvent (negative solvatochromism), and the bathochromic shifts in halogenated solvents were larger than those in non-halogenated solvents of similar epsilon(r) values. The influences of halogenated solvents on the large bathochromic shifts are studied on the basis of H-1 NMR measurements, semi-empirical molecular calculations (AM1 and INDO/S using the SCRF Onsager model), and absorption spectral measurements of the dyes adsorbed on nanocrystalline TiO2 film immersed in solvents.