72741-99-2Relevant academic research and scientific papers
Synthesis and photophysical study of some new highly thermostable blue fluorescent poly(1,3,4-oxadiazole-imide)s containing dimethylamine groups
Hamciuc, Corneliu,Homocianu, Mihaela,Hamciuc, Elena,Carja, Ionela-Daniela
, p. 17 - 25 (2016/04/26)
New poly(1,3,4-oxadiazole-imide)s were synthesized from a diamine containing 1,3,4-oxadiazole ring, 4,4′-diamino-4″-[(2-(4-phenoxy)-5-(4-dimethylaminophenyl)-1,3,4-oxadiazole]triphenylmethane, and different aromatic dianhydrides: 4,4′-(hexafluoroisopropylidene)diphthalic anhydride, 9,9-bis[(3,4-dicarboxyphenoxy)phenyl]fluorene dianhydride, 4,4′-(4,4′-isopropylidenediphenoxy)bis(phthalic anhydride) and perylene-3,4,9,10-tetracarboxylic dianhydride. The polymers were easily soluble in polar organic solvents and exhibited high thermal stability, having 5% weight loss in the range of 445-470 °C and glass transition temperature in the domain of 201-244 °C. The optical properties were investigated in different media. The absorption characteristics (intensity, absorption maximum and shape) of investigated compounds depended on their chemical structures and the nature of environment. The emission of these samples was represented by one broadened and blue emission band. The largest and solvent dependent Stokes shifts values were obtained. The fluorescence quantum yield (QY) values of polymer with hexafluoroisopropylidene groups, in tetrahydrofuran solution, depended on the wavelength used for excitation. This is an exception from Kasha's rule and Vavilov's law, which was attributed either to photodecomposition or to the enhancement of intramolecular energy transfer process competing with internal conversion between singlet states. High QY values were obtained for polymers with isopropylidene or fluorene units in dimethyl sulfoxide (polar solvent), which may be due to the strong overlap of electronic transitions of species from system.
Synthesis and electrochemical behavior of novel peripherally and non-peripherally substituted ball-type cobalt phthalocyanine complexes
Canlica, Mevlüde,Booysen, Irvin Noel,Nyokong, Tebello
experimental part, p. 522 - 528 (2011/03/21)
The syntheses of new ball-type Co(II) phthalocyanines containing 4,4′-(9H-fluorene-9,9-diyl)diphenol substituents at non-peripheral (complex 6) and peripheral (complex 7) positions are presented. These complexes were characterized by UV-Vis, FT-IR, mass s
Preparation and study of new poly(phenylquinoxaline-ether-imide)s
Lungu, Ramona,Hamciuc, Elena,Brumǎ, Maria,Szesztay, Marta,Müller, Peter,Belomoina, Nataliya M.
, p. 579 - 587 (2007/10/03)
New aromatic poly(phenylquinoxaline-ether-imide)s were synthesized by solution polycondensation reaction of aromatic diamines containing preformed phenylquinoxaline groups with two bis(ether-anhydride)s, namely 1,1-bis[p-{3,4-dicarboxyphenoxy)phenyl]cyclohexane dianhydride or 1,1-bis[p-(3,4-dicarboxyphenoxy)phenyl]fluorene dianhydride. All polymers were easily soluble in organic solvents, such as N-methylpyrrolidinone and dimethylacetamide, and even in less polar solvents like pyridine, tetrahydrofuran or chloroform, and gave flexible films by casting of such solutions. They showed high thermal stability, with an initial decomposition temperature above 300°C and a glass transition temperature in the range of 220-271°C. The polymer films exhibited good mechanical properties with tensile strength in the range of 38.5-78.2 MPa, elastic modulus in the range of 2.8-3.1 GPa and elongation to break in the range of 1.5-4.2%. The polymers showed weight- and number-average molecular weights in the range of 12000-23000 g/mol and 6000-11000 g/mol, respectively.
