Article ID Journal Published Year Pages File Type
1321954 Journal of Organometallic Chemistry 2013 8 Pages PDF
Abstract

Cyclotriphosphazene and cyclotetraphosphazene appended with six and eight covalently linked porphyrin–ferrocene conjugates respectively were synthesized by treating N3P3Cl6 and N4P4Cl8 with appropriate equivalents of ferrocene linked porphyrin containing meso-hydroxyphenyl group in THF in the presence of Cs2CO3 followed by column chromatographic purification. NMR and absorption studies indicated a weak interaction between adjacent porphyrin–ferrocene conjugates. Electrochemical studies supported electrochemical equivalence of ferrocenyl and porphyrinyl moieties in these multi-porphyrin–ferrocene conjugate assemblies. The fluorescence studies showed significant quenching of porphyrin fluorescence due to photo-induced electron transfer from ferrocene to singlet state of porphyrin unit in these assemblies.

Graphical abstractSynthesis, spectral and electrochemical properties of cyclophosphazenes appended with porphyrin–ferrocene conjugates are described.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Multi-porphyrin–ferrocene conjugate assemblies on cyclophosphazenes were synthesized. ► Cyclophosphazene rings are robust and stable. ► Absorption studies showed three/four fold intensity enhancement. ► Electrochemical studies supported electrochemical equivalence of ferrocene units. ► Fluorescence quenching was attributed to photo-induced electron transfer.

Related Topics
Physical Sciences and Engineering Chemistry Inorganic Chemistry
Authors
, ,