Quadrupolar solvatochromism: 4-amino-phthalimide in toluene

Anatoli A. Milischuk, Dmitry Matyushov

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Abstract

We present calculations of the temperature dependence of the solvent reorganization energy of 4-amino-phthalimide chromophore in quadrupolar toluene. The reorganization energy is a sum of the contributions from quadrupolar and induction solvation. We employ several calculation formalisms in order to evaluate their performance against the experiment. The point-dipole and full atomic distributions of solute charge are compared to show that the point-dipole approximation works well for this chromophore. We also show that most of the reorganization entropy comes from the quadrupolar response. Induction solvation amounts to about 10% of the entropy. Both the reorganization energy and the reorganization entropy are greatly affected by the local solute-solvent density profile (density reorganization) which contributes about half of their values. The induction reorganization energy is strongly affected by the microscopic, nonlocal nature of the density fluctuations of the solvent around the solute.

Original languageEnglish (US)
Article number204502
JournalJournal of Chemical Physics
Volume124
Issue number20
DOIs
Publication statusPublished - May 28 2006

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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