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Synthesis and light absorption of benzotellurazole crown ether cyanine dye
Author(s) -
Luo XueHong,
Liu XiuFang,
Xu HanSheng
Publication year - 1995
Publication title -
chinese journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.28
H-Index - 41
eISSN - 1614-7065
pISSN - 1001-604X
DOI - 10.1002/cjoc.19950130409
Subject(s) - chemistry , cyanine , iodide , salt (chemistry) , ammonium iodide , methyl iodide , acetic anhydride , absorption (acoustics) , alkylation , ethyl iodide , ammonium , organic chemistry , photochemistry , polymer chemistry , fluorescence , catalysis , physics , quantum mechanics , acoustics
Various methods for synthesis of 2‐methyl‐5,6‐(1,4,7,10,13‐pentaoxatridecamethylene)benzotellurazole ( 8) are described. Under different conditions, alkylation of compound 8 with methyl iodide gave telluronium salt 1,2‐dimethyl‐5,6‐(1,4,7,10,13‐pentaoxatridecamethylene)benzotellurazolium iodide (15) or quaternary ammonium salt 2,3‐dimethyl‐5,6‐(l,4,7,10,13‐pentaoxatridecamethylene)benzotellurazolium iodide (14) in high yields, repectively. The cyanine dye 3,3'‐dimethyl‐5,6,5',6'‐bis(1,4,7,10,13‐pentaoxatridecamethylene)telluracarbocyanine iodide (16) is obtained by condensation of 14 with ethyl orthoformate in acetic anhydride. The visible absorption of the cyanine dye is also discussed.