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The ethyl coumarin-3-carboxylate(1) and its two derivatives,ethyl 7-methoxy-2-oxo-2H-chromene-3-carboxylate(2) and ethyl 7-(3-methylbut-2-enyloxy)-2-oxo-2H-chromene-3-carboxylate(3),were synthesized,characterized and their UV-vis spectra and photoluminescence were investigated.Compound 2 crystallizes in the monoclinic system with space group C2/c,a = 25.884(4),b = 6.8365(11),c = 13.816(2) ,β = 104.876(2)°,V = 2362.9(7) 3,Z = 8,Dc = 1.396 g/cm3,Mr = 248.23,F(000) = 1040 and μ = 0.108 mm–1.Compound 3 crystallizes in the monoclinic system with space group P21/c,a = 15.685(6),b = 8.373(3),c = 13.063(5) ,β = 111.862(6)°,V = 1592.2(10) 3,Z = 4,Dc = 1.261 g/cm3,Mr = 302.31,F(000) = 640 and μ = 0.093 mm–1.Both the absorption and emission of the two derivatives were stronger than that of ethyl coumarin-3-carboxylate due to the larger conjugation of their electron donor group moiety at the 7-position.Under ultraviolet light excitation,the two derivatives exhibit strong blue-violet emission.
The ethyl coumarin-3-carboxylate (1) and its two derivatives, ethyl 7-methoxy-2-oxo-2H- chromene-3-carboxylate (2) and ethyl 7- (3-methylbut- oxo-2H-chromene-3-carboxylate (3), were synthesized, characterized and their UV-vis spectra and photoluminescence were investigated. Compound 2 crystallizes in the monoclinic system with space group C2 / c, a = 25.884 = 6.8365 (11), c = 13.816 (2) β, β = 104.876 (2) °, V = 2362.9 (7) 3, Z = 8 and Dc = 1.396 g / = 1040 and μ = 0.108 mm -1. Compound 3 crystallizes in the monoclinic system with space group P21 / c, a = 15.685 (6), b = 8.373 (3), c = 13.063 6) °, V = 1592.2 (10) 3, Z = 4, Dc = 1.261 g / cm3, Mr = 302.31, F (000) = 640 and μ = 0.093 mm-1.Both the absorption and emission of the two derivatives were stronger than that of ethyl coumarin-3-carboxylate due to the larger conjugation of their electron donor group moiety at the 7-position. Unde ultraviolet light excitation, the two derivatives exhibit strong blue -violet emission.