Analysis of solvation and structural contributions in spectral characteristics of dipyrrin Zn(II) complexes

• Spectral properties of dipyrrin Zn complexes in organic solvents were investigated.
• Spectral characteristics correlate with different solvent parameters.
• Specific solvation strongly affects the properties of the dipyrrin Zn complexes.
• Increasing of alkyl substitution lead to bathochromic shifts in complexes spectra.
• Solvatochromic characteristics for Zn complexes are differ from Bodipy.

Photophysical characteristics of several alkylated dipyrrin Zn(II) complexes in organic solvents were analyzed. Relations between spectral properties of complexes and physical–chemical parameters of solvents were determined with the use of linear regression analysis method. Each solvent parameter contribution in investigated spectral characteristics was estimated. Spectral properties of complexes under study depend on the specific interactions of zinc with the solvent molecules by specific axial coordination. Increasing of alkyl substitution lead to the bathochromic shifts in spectra due to the positive induction effect of alkyl groups.

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