Solvent scales used to study the intermolecular interactions in binary solutions of two p-aryl-pyridazinium methylids

• Solvent empirical scale are applied to spectral data of two pyridazinium ylids.
• The nature of electronic transition is established by quantum mechanical and spectral means.
• The interaction nature in solution is explained by Kamlet and Taft empirical scale.
• The supply of each type of interactions is estimated.

The visible electronic absorption band with intramolecular charge transfer of two pyridazinium ylids having common carbanion and different heterocycles is recorded in solutions and its position is correlated to parameters of some empirical scales of solvents. The nature of the intermolecular interactions in pyridazinium ylid solutions is discussed and the supply of each type of interaction is established based on solvatochromic study.

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