tetrahomodioxacalix[4]arene tetraamides and tetrathioamides with four p-phenyl groups on their upper rim were synthesized. From the (1)H and (13)C NMR and crystal structure, N-butylamido homooxacalix[4]arene (4) was found to be in the 1,3-alternate conformation and has intramolecularhydrogen bonding between N-H and facing oxygen atoms of the carbonyl O=C group. This hydrogen bonding decreased the metal ion complex
Intramolecular hydrogen bonding effect on metal ion complexation of homooxacalix[4]arene bearing tetraamides
作者:Kwanghyun No、Jeong Hyeon Lee、Seung Hwan Yang、Kwan Ho Noh、Soon W Lee、Jong Seung Kim
DOI:10.1016/s0040-4020(03)00281-3
日期:2003.3
N,N-Dipentylamido homooxacalix[4]arene (3) in the C-1,2-alternate conformation provided Pb2+ ion selectivity over other metal cations. N-Monopentylamido homooxacalix[4]arene in C-1,2-alternate conformation has an intramolecularhydrogen bonding, causing decrease of the metal ion complex ability.
C 1,2-交替构象的N,N-二戊基氨基同草酸[4]芳烃(3)提供了Pb 2+离子对其他金属阳离子的选择性。C-1,2-交替构象中的N-单戊基lamido homooxacalix [4]亚芳基具有分子内氢键,导致金属离子络合能力降低。