The author of 《Tuning of optical properties of p-phenyl ethenyl-E-furans: A Solvatochromism and Density functional theory》 were Kumar, Naresh; Paramasivam, Mahalingavelar; Kumar, Jagdeep; Gusain, Anamika; Hota, Prasanta Kumar. And the article was published in Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy in 2019. Recommanded Product: 4-Cyanobenzyl bromide The author mentioned the following in the article:
P-Ph ethenyl-E-furans (1-6) with varied electron donor and acceptor substituent (NO2, CN, Cl, H, OCH3, NH2) were synthesized and studied the substituent induced optical properties (dipole moment, transition dipole moment, oscillator strength, optical band gap, hyperpolarizability) using Solvatochromism and D. functional theory. It is shown that furan acts as a weak electron donor in presence of an electron withdrawing p-Ph substituent (NO2, CN, Cl), whereas furan acts as a weak electron acceptor in presence of an electron donating p-Ph substituent (OCH3, NH2). In comparison to ethenylfuran 4, the HOMO-LUMO energy band gap is decreased upon increasing the electron donating or electron withdrawing nature of the Ph ring. Calculation of excited state dipole moment and polarizability of 1-6 in solvent of varying polarity suggest that the nitro and amino compounds (1, 6) exhibit charge transfer excited state, whereas excited state of compounds 3-5 is non-polar in nature. As compared to the ethenylfuran (4), the first hyperpolarizability (β) is increased in presence of a strong electron withdrawing or strong electron donating p-Ph substituent. The higher β value is found for ethenylfuran with p-nitrophenyl and p-amino Ph substitution. Overall, these studies provide useful information in tuning the optical properties of p-Ph substituted heterocyclic ethenyl systems. In the experiment, the researchers used 4-Cyanobenzyl bromide(cas: 17201-43-3Recommanded Product: 4-Cyanobenzyl bromide)
4-Cyanobenzyl bromide(cas: 17201-43-3) is an important intermediate for pharmaceutical production. It can be used for the synthesis of a series of piperidine-linked aromatic diimidazolines, which have been synthesized as conformationally restricted congeners of the anti-Pneumocystis carinii (PCP) drug, Pentamidine.Recommanded Product: 4-Cyanobenzyl bromide
Referemce:
Nitrile – Wikipedia,
Nitriles – Chemistry LibreTexts