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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Nonlinear polarization of solvatochromic betaine 30
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Nonlinear polarization of solvatochromic betaine 30

机译：溶剂化甜菜碱30的非线性极化

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摘要

Evidence is presented that solvatochromism of 2,6-diphenyl-4-(2,4,6- triphenylpyridinio)-phenolate (Reichardts dye or Betaine 30) results not only from a large reduction of dipole moment and hydrogen bonding, but also from the modulation of mesomeric effect. The polarizability change between the ground and the excited state, estimated from the refractive index (n) dependence of absorption energy E_T(30), increases from 20 to ～150 ?~3 on going from apolar to highly polar media. The dependence of E_T(30) on dielectric permittivity (ε) could be linearized using an empirical function of susceptibility difference (ε - n ~2), but not in terms of conventional expressions written as θ(ε) - θ(n~2). As a result of solvent-induced change in ionicity and bond alternation, the dipole moments and polarizabilities of the chromophore cannot be treated as invariables. Hypsochromic shifts caused by solvent quadrupoles and bond dipoles were quantified.
机译：证据表明，2,6-二苯基-4-（2,4,6-三苯基吡啶基）-酚盐（Reichardts染料或甜菜碱30）的溶剂溶变色不仅是由于偶极矩和氢键的大量减少，而且是由于介观效应的调节。从吸收能E_T（30）的折射率（n）依赖性估计，从非极性介质到高极性介质，基态和激发态之间的极化率变化从20增加到〜150？〜3。 E_T（30）对介电常数（ε）的依赖性可以使用磁化率差（ε-n〜2）的经验函数线性化，但不能用写为θ（ε）-θ（n〜2）的常规表达式表示）。由于溶剂引起的离子性和键交替的变化，生色团的偶极矩和极化率不能视为不变。量化由溶剂四极和键偶极引起的七色位移。

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