Spectral and Solvation Properties of Some Dipyrromethene Hydrobromides and Their Oxa- and Thia- Analoges

The spectral and solvatation properties of hydrobromides of 3,3/,4,4/,5,5/-hexamethyldipyrromethene-2,2/, 3,3/,4,4/,5/-pentamethyldipyrromethene-2,2/,3,3/,4/,5,5/-pentamethyldipyrromethene-2,2/, 1/,3,4,5-tetramethyldipyrromethene-2,2/, 3,4,5-trimethyldipyrromethene-2,2/ and their oxa- and thia- analoges in benzene, n-propanol, chloroform, pyridine and N,N-dimethylformamide have been studied. The changes of relative solvation enthalpies are calculated and discussed.