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Simple modification of basic dyes with bulky & symmetric WCAs for improving their solubilities in organic solvents without color change

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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.

No MeSH data available.


Absorption spectra of modified dyes in chloroform (1.0 × 10−5 mol/L).
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f2: Absorption spectra of modified dyes in chloroform (1.0 × 10−5 mol/L).

Mentions: The absorption spectra of the modified dyes with bulky and symmetric anions are shown in Fig. 2 and Table 2. The absorption coefficient of the dyes were rounded to ten in consideration of some possible error from the analysis. In general, absorption in the solution state is unpredictably affected by such conditions as solvatochromism or dye aggregation. Moreover, the modified dyes are regarded as having molecular behaviours different from the unmodified dyes, therefore, a more accurate evaluation of optical performance will be achieved using the color locus18.


Simple modification of basic dyes with bulky & symmetric WCAs for improving their solubilities in organic solvents without color change
Absorption spectra of modified dyes in chloroform (1.0 × 10−5 mol/L).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5382776&req=5

f2: Absorption spectra of modified dyes in chloroform (1.0 × 10−5 mol/L).
Mentions: The absorption spectra of the modified dyes with bulky and symmetric anions are shown in Fig. 2 and Table 2. The absorption coefficient of the dyes were rounded to ten in consideration of some possible error from the analysis. In general, absorption in the solution state is unpredictably affected by such conditions as solvatochromism or dye aggregation. Moreover, the modified dyes are regarded as having molecular behaviours different from the unmodified dyes, therefore, a more accurate evaluation of optical performance will be achieved using the color locus18.

View Article: PubMed Central - PubMed

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.

No MeSH data available.