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  • Title: Inclusion properties of 3-fluoromesotetraphenylporphyrin with C60 and C70.
    Author: Bhattacharya S, Nayak SK, Chattopadhyay S, Ghosh K, Banerjee M.
    Journal: Spectrochim Acta A Mol Biomol Spectrosc; 2007 Aug; 67(5):1257-62. PubMed ID: 17161647.
    Abstract:
    To improve the selectivity ratio of C70 over C60, a new designer molecule, viz., 3-fluoromesotetraphenylporphyrin (1) has been reported in the present investigations. Fluorescence studies reveal that the Q-absorption band of 1 gets sufficient quenching effect upon addition of both C60 and C70. Binding constants (K) of the C60/1 and C70/1 complexes are estimated to be 580 and 10,800 dm3 mol(-1), respectively. Thus, K(C70)/K(C60) is approximately 19 which is very large and even comparable with other macrocyclic host molecules like calix[5]arene, azacalix[m]arene[n]pyridine, cyclotriveratrylenophane and calixarene bisporphyrin. 1H NMR chemical shift measurements show that the -NH- proton of 1 suffers more shifts in presence of C70 compared to C60. This finding also offers a good support in favor of high K value for C70/1 complex as well as large selectivity ratio of C70 over C60.
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