Journal
DYES AND PIGMENTS
Volume 64, Issue 2, Pages 125-134Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2004.05.003
Keywords
dyes; synthesis; fluorescence; squaraines
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We investigate the reactions of mono-substituted squaraines with CH-acidic nucleophiles, heterocyclic methylene bases and thionating reagents. The reactions of mono-substituted squaraines with malononitrile, cyano- and nitroacetic esters, barbituric acid, 1,3-indanedione, NaHS and P4S10 lead to ring-substituted mono-squaraines. These intermediates are useful for the synthesis of novel squaraine dyes with interesting photophysical properties. (C) 2004 Elsevier Ltd. All rights reserved.
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