Abstract
The synthesis of series of chromogenic di-substituted azocalix[4]arene derivatives is described. A ketone moiety as a different chelating agent is grafted on the lower rim of p-tert-butylcalix[4]arenes. Eight novel azocalix[4]arenes (1–8) are prepared by linking 2-, 3- and 4-nitroaniline, 4-phenylazoaniline, 3- and 4-chloroaniline or 2- and 4-methylaniline to 25,27-diacetonyloxy-26,28-dihydroxy-11,23-di-(tert-butyl)calix[4]arene through a diazo-coupling reaction, and characterized by UV–Vis, FT-IR and 1H-NMR spectroscopic techniques and elemental analysis, consecutively. The absorption spectra of the di-substituted azocalix[4]arenes are discussed, according to effect of varying pH and solvent upon the absorption ability of azocalix[4]arenes. The colors of these azocalix[4]arenes are compared with respect to nature of their aromatic rings and substituents there in. Concentration effects on the visible absorption maxima of these compounds are also reported.
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This work was supported in part by a grant from the Scientific Research Projects Council of Pamukkale University (PA.U. BAP, 2003/023). The authors would like to express their thanks to Prof. Alaattin ŞEN for his critical reading of draft manuscript and making many helpful suggestions and corrections.
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Karakuş, Ö.Ö., Deligöz, H. Azocalixarenes.8: synthesis and investigation of the absorption spectra of di-substituted azocalix[4]arenes containing chromogenic groups. J Incl Phenom Macrocycl Chem 61, 289–296 (2008). https://doi.org/10.1007/s10847-008-9421-9
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DOI: https://doi.org/10.1007/s10847-008-9421-9