Thermal properties of alkyl-substituted 3,3′-bis(dipyrrolylmethene) dihydrobromides

3,3′-Bis(dipyrrolylmethene) dihydrobromides (H2L·2HBr) with various types of alkylation have been synthesized. The compounds were characterized by recording of their proton NMR-, IR- and electronic absorption spectra. The thermal destruction of the compounds was studied thermogravimetrically. An increase in the degree of alkylation causes an increase of the salts thermal stability in air and argon.

► The thermodestruction of 3,3′-bis(dipyrromethene) dihydrobromides was performed.
► The dissociation stage of the salts with removal of HBr molecules are not observed.
► An increase of alkylation causes an increase of the salts thermal stability.
► The thermal stability a increase in argon as compared with air.