Absorption Spectra of Luminescent Thallous Chloride Solutions

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Abstract
The absorption spectra of solutions of KCl, made luminescent by the addition of TlCl, have been analyzed with the assistance of dissociation constants for TlCl and TlCl2— obtained from solubility measurements. Absorptivities for each of the absorbing species have been found at several wavelengths. Spectra of solutions having a wide variety of KCl and TlCl concentrations were calculated from the absorptivities and dissociation constants; these agree quite well with the observed spectra except at high Cl— concentration, where the disagreement is ascribed to the formation of more highly coordinated complexes. Decrease of dielectric constant of the solvent shifts the absorption band in the direction to be expected from an increase in the stability of molecular TlCl and the complex ions.

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