Synthesis and guest exchange reactions of inclusion compounds of cucurbit[8]uril with nickel(II) and copper(II) complexes
作者:T. V. Mitkina、D. Yu. Naumov、N. V. Kurat’eva、O. A. Gerasko、V. P. Fedin
DOI:10.1007/s11172-006-0211-5
日期:2006.1
Inclusion compounds of the macrocyclic cavitand cucurbit[8]uril (CB[8]) with the nickel(II) complex, trans-[Ni(en)2(H2O)2]@CB[8]}Cl2 · 23.5H2O, the copper(II) complex, 2[Cu(dien)(bipy)(H2O)]@CB[8]}(ClO4)4 · 11H2O, and the organic molecules, 2(pyCN)@CB[8]} · 16H2O and 2(bpe)@CB[8]} · 17H2O, where bipy is 4,4′-bipyridyl, pyCN is 4-cyanopyridine, and bpe is trans-1,2-bis(4-pyridyl)ethylene, were synthesized. The inclusion compounds with organic molecules were synthesized starting from inclusion compounds of cucurbit[8]uril with cyclam and ethylenediamine complexes of copper(II) and nickel(II) by the guest exchange method, which is based on the replacement of one guest with another in the cavity of the cavitand The resulting compounds were characterized by X-ray diffraction, ESR, 1H NMR, IR, and electronic absorption spectroscopy, and electrospray mass spectrometry. Photochemically induced [2+2]-cycloaddition of two 1,2-bis(4-pyridyl)ethylene molecules included in cucurbit[8]uril was studied.
宏观环状空腔受体葫芦脲[8](CB[8])与镍(II)配合物trans-[Ni(en)2(H2O)2]@CB[8]}Cl2·23.5H2O、铜(II)配合物2[Cu(dien)(bipy)(H2O)]@CB[8]}(ClO4)4·11H2O和有机分子2(pyCN)@CB[8]}·16H2O及2(bpe)@CB[8]}·17H2O(其中bipy是4,4'-联吡啶,pyCN是4-氰基吡啶,bpe是反式-1,2-双(4-吡啶基)乙烯)的包合化合物被合成。基于客体交换方法,即在空腔受体中一个客体被另一个客体置换,从CB[8]与铜(II)和镍(II)的环[14]烷和乙二胺配合物的包合物出发,合成有机分子的包合物。利用X射线衍射、电子自旋共振、核磁共振、红外光谱和电子吸收光谱以及电喷雾质谱对得到的化合物进行了表征。研究了在葫芦脲[8]中包含的两个1,2-双(4-吡啶基)乙烯分子在光化学诱导下的[2+2]环加成反应。