Synthesis and photo-physical properties of fluorescent 1,3,5-triazine styryl derivatives

Abstract

BackgroundOrganic fluorophore contains well-defined D-π-A (Donor-π system-Acceptor) push-pull system have wide application in the field of NLO, OLED and high tech application. Electron donor diphenyl, triphenyl and carbazole conjugated with electron acceptor terminal through π-system were reported recently for high-tech applications. N,N-Dialkyl substituted 1,3,5-triazine also acts as donor keeping this idea in mind we developed D-π-A styryl dyes.ResultsNovel "Y"-shaped acceptor-π-donor-π-acceptor type of compounds were synthesized from 4,4'-((6-(4-(diethylamino)phenyl)-1,3,5-triazine-2,4diyl)bis(oxy)) dibenzaldehyde (DIPOD) as electron donors and different active methylene compounds as electron acceptors by conventional Knoevenagel condensation reaction. Their photophysical and thermal properties were investigated.ConclusionIt was found that the strong electron acceptor-donor chromophoric system of these compounds showed high Stoke's shift and excellent thermal stability. Compounds showed positive solvatofluorism behavior from nonpolar to polar solvent. All compounds have good thermal stability.

Formation of Cyanamide–Glyoxal Oligomers in Aqueous Environments Relevant to Primeval and Astrochemical Scenarios: A Spectroscopic and Theoretical Study

“…[54] Moreover, 13 Cresonances in the range d = 160-166 ppm are to be expected. Their elemental compositions were enriched in nitrogen, which could only be rationalized in terms of selfcondensation reactions of cyanamide or cyanamide-rich mixtures.…”

Synthesis of Novel Fluorescent 2-{4-[1-(Pyridine-2-yl)-1H-pyrazol-3-yl] phenyl}-2H-naphtho [1,2-d] [1,2,3] triazolyl Derivatives and Evaluation of Their Thermal and Photophysical Properties

“…All the measurements were carried out keeping the parameters constant, namely, solvent and slit width. Relative quantum yield of all synthesized triazole derivatives 12a , 12b , 12c were calculated using a formula reported in literature .…”

“…The solid was filtered, washed separately with ice‐cold water to remove trace of acid, and dried to yield 2 . Yield: 55 g, 79%; mp 114°C (115–116°C, lit ).…”

ESIPT-inspired benzothiazole fluorescein: Photophysics of microenvironment pH and viscosity

“…Quantum yield of the synthesized compounds in water were calculated by using anthracene and fluorescein as reference standards using the comparative method [29]. The absorption and emission characteristics of the standards and the compounds were measured at different concentrations at (2,4,6,8, and 10 ppm level).…”

“…All the measurements were done by keeping the parameters constant such as solvent and slit width. The relative quantum yields of the synthesized compounds in different solvents were calculated by using the equation (1) [29] …”