fulltext.study @t Gmail

Synthesis and chemiluminescent properties of 6,8-diaryl-2-methylimidazo[1,2-a]pyrazin-3(7H)-ones: Systematic investigation of substituent effect at para-position of phenyl group at 8-position

Paper ID Volume ID Publish Year Pages File Format Full-Text
25881 43907 2014 14 PDF Available
Title
Synthesis and chemiluminescent properties of 6,8-diaryl-2-methylimidazo[1,2-a]pyrazin-3(7H)-ones: Systematic investigation of substituent effect at para-position of phenyl group at 8-position
Abstract

•Three Cypridina luciferin analogues with p-substituted phenyl at C8 were synthesized.•Their chemiluminescent properties in DMSO were investigated.•The chemiluminescence wavelength was shifted with the substituents.•An electron-attracting group caused redshift in the chemiluminescence maximum.•Quantitative data suggest there is no substituent effect on the chemiexcitation step.

6,8-Diphenylimidazopyrazinone derivatives having a substituent R (R = CF3, H, and OMe) at para position of the 8-phenyl group were synthesized and their chemiluminescent properties were investigated. The chemiluminescence maxima (CLmax) of these compounds were observed to be in the range of 513–553 nm with a bathochromic shift that increased with the electron-withdrawing character of R, contrary to the previously observed substituent effect at the 6-postion. The chemiluminescence efficiencies (ϕCL) of these imidazopyrazinones were improved by the introduction of a p-substituted phenyl group at the 8-position. The quantitative investigation of the three quantum efficiencies (ϕR, ϕS, and ϕFL) whose product gives us ϕCL revealed that the ϕCL gains made were largely because of the increase in the values of the fluorescence quantum yields of the corresponding light emitters (ϕFL). The yields of the singlet-excited emitters (ϕS) during the chemiluminescent reaction were found to be very small (0.015–0.019), suggesting that one cannot construct an efficient imidazopyrazinone–chemiluminescence system that is comparable to the aequorin bioluminescence system only by using the electronic effects of substituents.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slide

Keywords
Imidazo[1,2-a]pyrazin-3(7H)-one; Chemiluminescence; Substituent effect
First Page Preview
Synthesis and chemiluminescent properties of 6,8-diaryl-2-methylimidazo[1,2-a]pyrazin-3(7H)-ones: Systematic investigation of substituent effect at para-position of phenyl group at 8-position
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 293, 1 November 2014, Pages 12–25
Authors
, , , ,
Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us