Study of novel interactions of calixarene π-systems with [60]- and [70]fullerenes by the NMR spectrometric method

被引:27
作者
Bhattacharya, S
Nayak, SK
Chattopadhyay, S
Banerjee, M
Mukherjee, AK [1 ]
机构
[1] Univ Burdwan Golapbag, Dept Chem, Burdwan 713104, W Bengal, India
[2] Bhabha Atom Res Ctr, Div Bioorgan, Bombay 400085, Maharashtra, India
关键词
D O I
10.1021/jp030418u
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Both [60]- and [70]fullerenes have been shown to form 1:1 supramolecular complexes with (i) 49,50,51,52,53,54,55,56-octamethoxy-5,11,17,23,29,35,41,47-octa-(4-tert-butyl)calix[8]arene (1), (ii) 37,38,39,40,41,42-hex amethoxy-5,11,17,23,29,3 5 -hexa(4-tert-butyl)calix [6] arene (2), (iii) 37,39,41-trimethoxy-38,40,42-trihydroxy-5,11,17,23,29,35-hexa-(4-tert-butyl)calix[6]arene (3), and (4) 24,26-dimethoxy-25,27-dihydroxy-5,11, 17,23-tetra(4-tert-butyl)calix[4]arene (4) in carbon tetrachloride medium by NMR spectroscopy. Formation constants (K) of the above complexes have been determined from the systematic variation of NMR chemical shifts of specific protons of the calixarenes in the presence of [60]- and [70]fullerene. In one particular case it has been possible to show from the C-13 NMR signal that during inclusion the host (3) is preorganized in the conical conformation and the guest molecule approaches from the wider side containing the tert-butyl group.
引用
收藏
页码:11830 / 11834
页数:5
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