Abstract
We report a simple and convenient method to evaluate the relative ionicity delta of the typical intramolecular charge-transfer (CT) molecules linked by pi-bond Ddelta+-pi-Adelta- (D, donor; A, acceptor; delta, degree of CT) derived from 1,3,3-trimethyl-2-methylene indoline and TCNQ derivatives on the basis of the solvatochromic effects of the CT band in various solvents and their redox properties. The functionality of the intramolecular CT molecules as dyes, photovoltaic materials, nonlinear optics, rectifiers, and conductors is discussed in terms of delta.
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