Solvatochromism of novel donor-π-acceptor type pyridinium dyes in halogenated and non-halogenated solvents

Yousuke Ooyama; Risa Asada; Shogo Inoue

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Solvatochromism of novel donor-π-acceptor type pyridinium dyes in halogenated and non-halogenated solvents

机译：新型供体-π-受体型吡啶鎓染料在卤代和非卤代溶剂中的溶剂变色

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Donor-π-acceptor type pyridinium dyes that have been newly synthesized showed bathochromic shift of the absorption band with decreasing dielectric constant (ε_r) of solvent (negative solvatochromism), and the bathochromic shifts in halogenated solvents were larger than those in non-halogenated solvents of similar ε_r values. The influences of halogenated solvents on the large bathochromic shifts are studied on the basis of ~1H 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.

机译：新合成的供体-π-受体型吡啶鎓染料表现出吸收带的红移与溶剂的介电常数（ε_r）降低（负溶剂变色），卤化溶剂中的红移比非卤代溶剂中的大。相似的ε_r值。在〜1H NMR测量，半经验分子计算（使用SCRF Onsager模型的AM1和INDO / S）以及吸附在纳米TiO2上的染料的吸收光谱测量的基础上，研究了卤代溶剂对大红移的影响。薄膜浸入溶剂中。

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《New Journal of Chemistry》 |2009年第11期|共6页
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Yousuke Ooyama; Risa Asada; Shogo Inoue;
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Solvatochromism of novel donor-π-acceptor type pyridinium dyes in halogenated and non-halogenated solvents

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