Abstract
A simple and easy solubility enhancement of basic dyes was performed with bulky and symmetric weakly coordinating anions (WCAs). The WCAs decreased the ionic character of the dyes by broadening the partial charge distribution and causing a screening effect on the ionic bonding. This new modification with WCAs has advantages in that it has no influence on the optical properties of the dyes. The solubilities of unmodified and modified dyes were tested in several organic solvents. X-ray powder diffraction patterns of the dyes were measured. Color films were prepared with the dyes and their color loci were analyzed to evaluate the optical properties. By the modification with WCAs, commercial basic dyes showed sufficient solubilities for be applied to various applications while preserving their superior optical properties.
Highlights
A simple and easy solubility enhancement of basic dyes was performed with bulky and symmetric weakly coordinating anions (WCAs)
Most research using Weakly coordinating anions (WCAs) has been performed with inorganic materials, but recently, some research that applies WCAs to organic materials has been reported[10,11,12,13]
We focus on the effect of WCAs that could be applicable to enhancing the solubility of commercial basic dyes
Summary
Basic dyes with bulky and symmetric WCAs behave like non-ionic organic molecules As a result, they show higher solubilities in organic solvents than unmodified basic dyes. The solubilities of the modified dyes with WCAs are influenced by molecular structures and planarity, similar to general non-ionic organic molecules. In the blue-shifted region, and the absorption spectra of the dyes are slightly broadened It can be concluded that the modification of the basic dyes with WCAs has no influence on the optical performance of the dyes, because the WCAs have no effect on the conjugated system of the dyes
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