A comparative study of molecular complexation of [60]- and [70]fullerenes with 1,3,5-tribromobenzene by UV-vis spectrophotometric method.
By UV-vis spectrophotometric method it has been shown that 1,3,5-tribromobenzene (TBB) forms molecular complexes of 1:2 stoichiometry with [60]- and [70]fullerenes. An isosbestic point could be detected in case of the [70]fullerene complex. The formation constant of the [60]fullerene complex is higher than that of the [70]fullerene complex at each of the four temperatures under study. This is in opposite order of the electron affinities of the two fullerenes; moreover, no charge transfer band was observed in the spectra of either complex in solution. This indicates that van der Waals forces, rather than CT interactions, are responsible for complexation. The results reveal that the C-atoms at the pentagon vertices of [60]fullerene have greater polarizing power than those in [70]fullerene.
Datta
Kakali
K
Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713104, West Bengal, India.
Mukherjee
Asok K
AK
D001555:Benzene Derivatives / Q000737:chemistry*; D037741:Fullerenes / Q000737:chemistry*; D008958:Models, Molecular; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D013816:Thermodynamics
D001555:Benzene Derivatives; D037741:Fullerenes; C069836:fullerene C70; C055383:1,3,5-tribromobenzene; C069837:fullerene C60