A Cyclic Porphyrin Trimer as a Receptor for Fullerenes
Organic Letters2010Vol. 12(15), pp. 3544–3547
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Guzmán Gil‐Ramírez, Steven D. Karlen, Atsuomi Shundo, Kyriakos Porfyrakis, Yasuhiro Ito, G. Andrew D. Briggs, John J. L. Morton, Harry L. Anderson
Abstract
A cyclic porphyrin trimer has been synthesized which has a high affinity for fullerenes. It forms 1:1 complexes with C(60) and C(70) with association constants of 2 x 10(6) and 2 x 10(8) M(-1), respectively, in toluene. Its affinities for C(86) and La@C(82) are too strong to measure by fluorescence titration. The solvent dependence of the association constants shows that solvation of both the guest and the host influence the binding strength.
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