title: Spectrophotometric study of the supramolecular complexes of [60]- and [70]Fullerenes with biscalix[6]arene and crown[4]calix[6]arene.
abstract: [60]- and [70]Fullerenes have been shown to form 1:1 supramolecular complexes with bis[2-(5,11,17,23,29,35-hexa-tert-butyl-37,38,39,40,41-pentahydroxycalix[6]arenyl-oxy ethyl ether) (1) and 5,11,17,23,29,35-hexa-tert-butyl-37,38,40,41-tetra hydroxyl-39,42-(crown-4)calix[6]arene (2) in CHCl3 medium by electronic absorption spectroscopy. Formation constants (K) of the complexes of [60]- and [70]fullerenes with 1 and 2 have been determined at room temperature from which free energy of formation values of the complexes have been estimated. The very high formation constant value of [60]fullerene/1 complex (5900 dm3 mol-1) in indicative of formation of inclusion complex. Moreover, PM3 calculations reveal that intermolecular interaction between [60]fullerene and 1 proceeds through quite deep energy molecular orbital.
authors.affiliation: Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713104, India.
authors.forename: Kalyan
authors.initials: K
authors.lastname: Ghosh
authors.forename: Abha
authors.initials: A
authors.lastname: Semwal
authors.forename: Sandip K
authors.initials: SK
authors.lastname: Nayak
authors.forename: Shrabanti Bhattacharya
authors.initials: SB
authors.lastname: Banerjee
authors.forename: Manas
authors.initials: M
authors.lastname: Banerjee
mesh_terms: D047250:Calixarenes / Q000737:chemistry*; D047248:Crown Compounds / Q000737:chemistry*; D004583:Electrons; D037741:Fullerenes / Q000737:chemistry*; D007700:Kinetics; D008956:Models, Chemical; D013053:Spectrophotometry
chemical_list: D047248:Crown Compounds; D037741:Fullerenes; D047250:Calixarenes