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Substituent Dependent Photoreactivity of Donor-Acceptor Substituted Phenyl Ethenes

[ Vol. 15 , Issue. 6 ]

Author(s):

Naresh Kumar, Prasanta Kumar Hota* and Jagdeep Kumar   Pages 479 - 484 ( 6 )

Abstract:


Fluorescence and photoisomerization studies on donor-acceptor substituted phenyl conjugated molecules [e.g. 2-[(1E)-2-(4-nitrophenyl)ethenyl]furan (trans-1) and 2-[(1E)-2-(4-aminophenyl)- ethenyl]furan (trans-2)] in solvents of varying polarity suggest that ethenylfuran trans-1, with strong electron acceptor, exhibits large solvatochromic red shifted fluorescence maximum, highly dipolar excited state, and photostability. On the other hand, ethenylfuran trans-2 with electron donor amino substituent, is photoreactive and undergoes trans-cis photoisomerization. These results suggest that, in such systems, highly dipolar excited state does not favor trans-cis photoisomerization.

Keywords:

Charge transfer, dipole moment, donor-acceptor systems, fluorescence, photochemistry, photoisomerization, quantum yield.

Affiliation:

Department of Chemistry, School of Sciences, Hemvati Nandan Bahuguna Garhwal University, Srinagar (Garhwal), Uttarakhand-246174, Department of Chemistry, School of Sciences, Hemvati Nandan Bahuguna Garhwal University, Srinagar (Garhwal), Uttarakhand-246174, Department of Chemistry, School of Sciences, Hemvati Nandan Bahuguna Garhwal University, Srinagar (Garhwal), Uttarakhand-246174

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