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Absorption and fluorescence spectra of some Sudan dyes (Sudan III , Sudan IV and Sudan black B) were recorded in various solvents, in the range of 300-800 nm, at room temperature. The solvatochromic behavior of these substances and their solvent-solute interactions were analyzed by means of linear solvation energy relationship concept, suggested by Kamlet-Taft. Obtained results, express the effect of solvation on tautomerism and molecular configuration (geometry) of Sudan dyes in solvent media. Furthermore, analysis of solvent-solute interactions suggests different forms of resonance structures of Sudan dyes, in polar and low-polar solvents.

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The triazole and its derivatives applications' in many drugs make the investigation of specific and non-specific interactions of these compounds with their environments important. Hence, absorption and emission spectra of two triazole compounds, with same molecular skeleton and different substituted groups on triazole ring, were studied in various solvents at room temperature. The solute's photo-physical behavior strongly depends on the nature of solvent and solute, along with the solvent–solute interactions. Using solvatochromic method, the samples' dipole moments variations, from ground to excited states, were investigated in solvent media. For understanding the effect of intermolecular interactions on spectral behaviors of these materials in different solvent and extend of solvent-solute interactions, the spectral variations were analyzed by means of linear solvation energy relationships concept, proposed by Kamlet and Taft.

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