Photophysical insights into supramolecular interaction of a designed bisporphyrin with fullerenes C60 and C70.
The present paper reports the photophysical investigations of a designed bisporphyrin (1), and its supramolecular complexes with C60 and C70 in toluene medium. UV-vis studies reveal appreciable ground state interaction between fullerenes and 1. The stoichiometry of the fullerene complexes of 1 is found to be 1:1. Steady state fluorescence studies elicit quenching of fluorescence of 1 in the presence of fullerenes. The binding constants of the C60/1 and C70/1 complexes are estimated to be 3760 and 31,222.5 dm3 mol(-1), respectively. Time resolved emission studies establish relatively long-lived charge separated state for the C70/1 complex. Molecular mechanics calculations in vacuo evoke the stereoscopic structures of the fullerene/1 complexes and interpret the stability difference between C60 and C70 complexes of 1 in terms of heat of formation values.
Department of Chemistry, The University of Burdwan, Golapbag, Burdwan 713 104, West Bengal, India.
Debabrata
D
Pal
Mina
M
Furukawa
Naoki
N
Komatsu
Hidemitsu
H
Uno
Sumanta
S
Bhattacharya
D037741:Fullerenes / Q000737:chemistry*; D007700:Kinetics; D055620:Optical Phenomena; D011166:Porphyrins / Q000737:chemistry*; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet; D013997:Time Factors
D037741:Fullerenes; D011166:Porphyrins; C069836:fullerene C70; C069837:fullerene C60