An article Distinctive tunable photophysical properties of versatile environmentally-sensitive tribranched cyanopyridine fluorophores WOS:000608170700010 published article about INTRAMOLECULAR CHARGE-TRANSFER; INTERMOLECULAR HYDROGEN-BOND; EXCITED-STATE; INCORPORATING PYRENE; MOLECULAR-MECHANISM; SOLVENT POLARITY; FLUORESCENT DYES; BEHAVIOR; LUMINESCENT; EMISSION in [Hussein, Essam M.; El Guesmi, Nizar; Ahmed, Saleh A.] Umm Al Qura Univ, Fac Appl Sci, Dept Chem, Mecca 21955, Saudi Arabia; [Hussein, Essam M.; Ahmed, Saleh A.] Assiut Univ, Fac Sci, Dept Chem, Assiut 71516, Egypt; [El Guesmi, Nizar] Fac Sci Monastir, Dept Chim, Ave Environm, Monastir 5019, Tunisia in 2021, Cited 75. The Name is 4-Methoxybenzaldehyde. Through research, I have a further understanding and discovery of 123-11-5. HPLC of Formula: C8H8O2
In the present work, twenty-four environmentally-sensitive cyanopyridine fluorophores bearing pyrene and/ or fluorene with different para-substituted-phenyl moieties that have been previously designed and synthesized by us are studied in depth for their photophysical properties. Initially, the optical performances of the compounds were investigated by employing UV-visible and fluorescence spectroscopic tools in various aprotic and protic solvents. All the compounds exhibited absorption bands between 310 and 452 nm, and emission bands between 454 and 633 nm. High sensitivity emission spectra with solvents of different polarities were recorded and studied. The fluorescence quantum yield (phi(f)) increased in solvents of low polarity and decreased on increasing the polarity of solvents. On the other hand, in case of strong electron donating (-NMe2) and strong electron attracting (-CN) substitution, a pronounced increase in Stokes shifts (up to 252 nm, 14250 cm(-1)) were recorded. Lippert-Mataga and Reichardts correlations, applied for estimating the variation in dipole moments (Delta mu), suggested that the emissive state of designed fluorescence 3-cyanopyridine derivatives is of strong ICT character. The aprotic and protic solvents gave a linear plot for the Stokes shifts in a Lippert-Mataga plot, which appeared as two distinct domains in E-T(30) scales indicating the presence of hydrogen bondings. It was observed that for compounds 5b – 8b, with (-NMe2) group on the skeleton of phenyl ring, the Lippert-Mataga and Reichardt-Dimroth’s plots deviated from linearity signifying that 5b – 8b molecules were involved in specific interaction with protic solvents. (C) 2020 Elsevier B.V. All rights reserved.
HPLC of Formula: C8H8O2. About 4-Methoxybenzaldehyde, If you have any questions, you can contact Hussein, EM; El Guesmi, N; Ahmed, SA or concate me.
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Indole alkaloid derivatives as building blocks of natural products from Bacillus thuringiensis and Bacillus velezensis and their antibacterial and antifungal activity study,
,Preparation of Indole Containing Building Blocks for the Regiospecific Construction of Indole Appended Pyrazoles and Pyrroles