Journal
INORGANICA CHIMICA ACTA
Volume 366, Issue 1, Pages 161-172Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.ica.2010.10.031
Keywords
Dendrimer; Cyclotriphosphazenes; P-31 NMR; Thermal stability; Fluorescence
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In the present study, we describe the synthesis of a hydroxyl substituted bridged phenoxycyclotriphosphazene (5), [N3P3(OPh)(5)OPhO(OPh)(5)N3P3OPhOH], as a side group and its use for preparation of dendrimeric cyclic phosphazenes. For this purposes, compound 5 is synthesised in five steps from the reactions of cyclotriphosphazene with phenol derivatives. The dendrimeric compounds 6 and 7 have been prepared by the reactions of compound 5 with hexachlorocyclotriphosphazene, N3P3Cl6, or octachlorocyclotetraphosphazene, N4P4Cl8, respectively. Newly synthesized compounds have been fully characterized by elemental analysis, MALDI-TOF mass spectrometry, FT-IR, H-1, C-13 and P-31 NMR spectroscopy. The thermal stability and fluorescence spectral properties of dendrimeric compounds 6 and 7 are investigated and compared with that of the previously reported cyclic compounds (I-II). Fluorescence quantum yields and lifetimes of dendrimeric compounds and their quenching behaviour by 1,4-benzoquinone are studied in dichloromethane. (C) 2010 Elsevier B.V. All rights reserved.
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