title: Synthesis and spectroscopic properties of β-triazoloporphyrin-xanthone dyads.
abstract: A novel series of β-triazoloporphyrin-xanthone conjugates and xanthone-bridged β-triazoloporphyrin dyads has been synthesized in moderate to good yields through Cu(I)-catalyzed Huisgen 1,3-dipolar cycloaddition reaction of copper(II) 2-azido-5,10,15,20-tetraphenylporphyrin or zinc(II) 2-azidomethyl-5,10,15,20-tetraphenylporphyrin with various alkyne derivatives of xanthones in DMF containing CuSO4 and ascorbic acid at 80 °C. Furthermore, these metalloporphyrins underwent demetalation under acidic conditions to afford the corresponding free-base porphyrins in good to excellent yields. After successful spectroscopic characterization, these porphyrins have been evaluated for their photophysical properties. The preliminary results revealed a bathochromic shift in the UV-vis and fluorescence spectra of these porphyrin-xanthone dyads.
authors.affiliation: Department of Chemistry, University of Delhi, Delhi 110 007, India.
authors.forename: Dileep Kumar
authors.initials: DK
authors.lastname: Singh
authors.affiliation: Department of Chemistry, University of Delhi, Delhi 110 007, India.
authors.forename: Mahendra
authors.initials: M
authors.lastname: Nath
keywords: 1,3-dipolar cycloaddition; UV–vis spectroscopy; fluorescence; synthesis; triazoloporphyrin-xanthone dyads