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|Title:||Synthesis of new donor-acceptor thiophene linked coumarin chromophores: Potential photosensitizers for dye sensitized solar cells|
|Authors:||Mashraqui, Sabir H|
|Keywords:||Coumarin-thiophenyl dyes;Synthesis;Optical spectral studies;Extinction coefficients;Band gaps|
|Abstract:||Synthesis of four new dyes, designated as C1-C4, incorporating dialkylamino coumarin as a donor, thiophene ring as a common spacer and quinazolinone-N-acetic acid, homophthalimide-N-acetic acid, rhodanine acetic acid and indoline carboxylic acid as acceptors, respectively is reported. Condensation of 4-diethylaminosalicaldehyde with thiophene-2-acetic acid methyl ester afforded 3-(2-thiophenyl) coumarin 3, which has been formylated to afford aldehyde 4. Knoevenagel condensation of 4 with four different acceptors affords C1-C4. The dyes show absorption maxima in the range of 497 to 538 nm and high extinction coefficients in the range of 32700 to 54300 M−1cm−1. The band gaps of C1-C4, derived from the absorption cut-off edges are estimated to be 2.21, 2.27, 2.09 and 2.00 eV respectively. High extinction coefficients coupled with narrow band gaps are promising features of these dyes which may allow them to act as photosensitizers in dye sensitized solar cells.|
|Appears in Collections:||IJC-B Vol.58B(07) [July 2019]|
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