Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/xmlui/handle/100/17380
Title: Multi-Expanded Porphyrin Assemblies on Cyclophosphazene Scaffolds
Authors: KAUR, T
KHAN, TK
RAVIKANTH, M
Keywords: Excited-State Photodynamics
Energy-Transfer
Enhanced Transport
Electron-Transfer
Anion-Binding
Core
Sapphyrin
Square
Ring
Metalloporphyrins
Issue Date: 2015
Publisher: WILEY-V C H VERLAG GMBH
Citation: EUROPEAN JOURNAL OF ORGANIC CHEMISTRY(14)3157-3163
Abstract: Cyclotriphosphazene and cyclotetraphosphazene appended with six and eight sapphyrin units, respectively, were prepared by treating N3P3Cl6 and N4P4Cl8 with the appropriate equivalents of 5,10,15-tri(p-tolyl)-20-(4-hydroxyphenyl)-25,27,29-trithiasapphyrin in tetrahydrofuran (THF) in the presence of Cs2CO3 at temperatures of 0 to 60 degrees C for 8-12 h. The two multi-expanded porphyrin assemblies were soluble in common organic solvents, and their identities were confirmed by their corresponding molecular ion peak in the MALDI-TOF mass spectra. 1D and 2D NMR spectroscopic techniques were used to deduce the molecular structures of the mult-expanded porphyrin assemblies. Absorption spectral studies showed that the band positions of the multi-sapphyrin assemblies were similar to that of the monomeric sapphyrin, but the extinction coefficients were three-to fourfold higher than that of the monomeric sapphyrin. The multisapphyrin assemblies are not very stable under redox conditions.
URI: http://dx.doi.org/10.1002/ejoc.201500131
http://dspace.library.iitb.ac.in/jspui/handle/100/17380
ISSN: 1434-193X
1099-0690
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