Cyclic metalloporphyrin dimers and tetramers: Tunable shape-selective hosts for fullerenes

Byungman Kang, Ryan K. Totten, Mitchell H. Weston, Joseph T. Hupp, Sonbinh T. Nguyen

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Covalently linked cyclic metalloporphyrin dimers and tetramers have been demonstrated to be good shape-selective hosts for fullerene guests. The fullerene affinities of these hosts can readily be tuned by modulating the covalent linkage and the metal ions in the porphyrin subunits. A rigid Zn(porphyrin) dimer with conjugated bis(alkynyl) linkers exhibits a high selectivity towards C70 over C60 in toluene (K a,C70/Ka,C60 = ∼28). For the host structures examined, a synergistic combination of rigidity in the linker and electropositive Al ions gives rise to the strongest binding of C70. In the case of a bisected Zn(porphyrin) tetramer, two well-defined cavities exist; however, due to their comparatively small size, only one C60 can be accommodated. Studies of fullerene binding as a function of metal ion in a porphyrin divider suggest that the right combination of shape and steric match is essential to exploit both van der Waals and local-charge/induced-dipole interactions.

Original languageEnglish
Pages (from-to)12156-12162
Number of pages7
JournalDalton Transactions
Volume41
Issue number39
DOIs
Publication statusPublished - Oct 21 2012

ASJC Scopus subject areas

  • Inorganic Chemistry

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