309956-59-0Relevant academic research and scientific papers
Thermal oxidative degradation of the functionally substituted 2,2′-dipyrrolylmethenes hydrobromides and difluoroborates
Yutanova,Berezin,Semeikin,Antina,Guseva,V'Yugin
, p. 545 - 551 (2013/08/23)
Thermal oxidative decomposition of samples of crystalline hydrobromide and borofluoride complexes (BODIPY) of a series of 2,2′-dipyrrolylmethenes (HL) was studied by means of thermogravimetry in an atmosphere of air oxygen. An increase in the degree and symmetry of substitution, aromaticity, and the length of the substituents in 4,4′-positions of the pyrrole ligand rings increases stability of the BODIPY-dyes to oxidative degradation. A comparative analysis of the influence of structural factors on the thermolability of hydrobromdes (HL·HBr), d-metal (ML2) and boron(III) complexes with 2,2′-dipyrrolylmethenes was carried out.
Alkyl-substituted dipyrrylmethenes and their oxa- and thia-analogs: Structure - Solvation properties correlations
Semeikin,Berezin,Chernova,Antina,Syrbu,Lyubimova,Kutepov
, p. 1807 - 1813 (2007/10/03)
New data on the spectral properties and solution enthalpies of unsymmetrically substituted 2-(alkyl-2-pyrrolylmethylidene)methylpyrrolium bromides (or α,α-dipyrrylmethene hydrobromides), their α,β-, β,β-isomers, as well as their oxa and thia analogs, that is, 2-(2-furylmethylidene)- and 2-(2-thienylmethylidene)-3,4,5-trimethyl- 1H-pyrrolium bromides, in solutions of organic solvents of different nature are presented. A decrease in the number of substituents, as well as replacement of the heteroatom (N) in one five-membered ring of the dipyrrylmetnehe by oxygen or sulfur atoms cause a monotonic hypsochromic shift of absorption bands in the electronic absorption spectrum and weakening of the chromophore properties of the compounds. The chromophore properties of isomers are weakened from the α,α- to α,β- and β,β-dipyrrylmethenes. Main trends in the influence of structural factors on the specific features of thermooxidative destruction of the above-mentioned compounds were analyzed.
Synthesis and physicochemical properties of hydrobromides of alkyl-substituted dipyrrolylmethenes
Berezin,Semeikin,Antina,Pashanova,Lehedeva,Bukushina
, p. 1949 - 1955 (2007/10/03)
Hydrobromides of [(alkylpyrrol-2(1H)-ylidenio)methyl]pyrroles (α,α-dipyrrolylmethenes) and of their α,β and β,β isomers were prepared, and their resistance to oxidative thermal degradation was studied. The solvation properties of these compounds in various organic solvents were examined spectrophotometrically and calorimetrically.
