Synthesis and solvatochromic behaviour of new asymmetrical mono-(tri)-methine cyanine dyes

6-Amino-5-cyano-3-methyl-1,4-diarylpyrano[2,3-c]pyrazole derivatives were prepared via the interaction ofα, β-unsaturated nitriles with 3-methyl-1-phenylpyrazol-5-one as starting materials in the synthesis of new asymmetrical mono-(tri)-methine cyanine dyes. The new cyanines were characterised by el...

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Bibliographic Details
Published inJournal of chemical sciences (Bangalore, India) Vol. 110; no. 4; pp. 433 - 444
Main Authors Abd El-Aal, R M, Abd El-Latif, F M, Koraiem, A I M
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Nature B.V 01.08.1998
Subjects
Absorption spectra
Asymmetry
Buffer solutions
Chemical analysis
Chemical synthesis
Cyanine dyes
Nitriles
NMR
Nuclear magnetic resonance
Pyrazole
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Summary:6-Amino-5-cyano-3-methyl-1,4-diarylpyrano[2,3-c]pyrazole derivatives were prepared via the interaction ofα, β-unsaturated nitriles with 3-methyl-1-phenylpyrazol-5-one as starting materials in the synthesis of new asymmetrical mono-(tri)-methine cyanine dyes. The new cyanines were characterised by elemental analysis, IR and1H-NMR spectral data. The visible absorption spectra of some selected dyes were investigated in pure and mixed solvents as well as in aqueous buffer solutions.
ISSN:0253-4134
0974-3626
0973-7103
DOI:10.1007/BF02872576