Multi-expanded porphyrin assemblies on cyclophosphazene scaffolds

Kaur, Tejinder ; Khan, Tamanna K. ; Ravikanth, Mangalampalli (2015) Multi-expanded porphyrin assemblies on cyclophosphazene scaffolds European Journal of Organic Chemistry, 2015 (14). pp. 3157-3163. ISSN 1434-193X

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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 °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 multisapphyrin assemblies were similar to that of the monomeric sapphyrin, but the extinction coefficients were three- to four-fold higher than that of the monomeric sapphyrin. The multisapphyrin assemblies are not very stable under redox conditions.

Item Type:Article
Source:Copyright of this article belongs to John Wiley & Sons, Inc.
ID Code:104930
Deposited On:30 Nov 2017 12:20
Last Modified:30 Nov 2017 12:20

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