Abstract
AbstractCyclotriphosphazene 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 fourfold higher than that of the monomeric sapphyrin. The multisapphyrin assemblies are not very stable under redox conditions.
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