CEA, IRAMIS, UMR 3299 CEA/CNRS, SIS2M, LCCEf, Bât. 125, 91191 Gif-sur-Yvette, France.
Inorg Chem. 2011 Nov 7;50(21):10558-60. doi: 10.1021/ic201965k. Epub 2011 Oct 6.
The reaction of neodymium, europium, or terbium nitrate with cucurbit[6]uril (CB6) in the presence of the α-amino acid L-cysteine (L-cys) gives the complexes [Nd(L-cys)(CB6)(NO(3))(H(2)O)(4)]·2NO(3)·10H(2)O (1) and {[Ln(L-cys)(CB6)(H(2)O)(5)][Ln(L-cys)(CB6)(NO(3))(H(2)O)(4)]}·5NO(3)·22H(2)O with Ln = Eu (2) or Tb (3). 2 and 3 only differ from 1 by the presence of two independent metal ions in slightly different environments. In all cases, each metal atom is bound to the bidentate CB6 and the monodentate L-cys molecules, with the latter being in its zwitterionic form. The ammonium group of L-cys is directed away from CB6 and is involved in ion-dipole and hydrogen bonding interactions with the uncomplexed portal of the neighboring molecule, which gives rise to the formation of chiral one-dimensional assemblies of columnar shape.
硝酸钕、硝酸铕或硝酸铽与[6]轮烷（CB6）在α-氨基酸 L-半胱氨酸（L-cys）存在下的反应，生成了配合物[Nd(L-cys)(CB6)(NO3)(H2O)4]·2NO3·10H2O（1）和{[Ln(L-cys)(CB6)(H2O)5][Ln(L-cys)(CB6)(NO3)(H2O)4]}·5NO3·22H2O（其中 Ln = Eu（2）或 Tb（3））。2 和 3 与 1 的区别仅在于存在两个略微不同环境的独立金属离子。在所有情况下，每个金属原子都与双齿 CB6 和单齿 L-cys 分子结合，后者呈两性离子形式。L-cys 的铵基团远离 CB6，并与相邻分子未配位的门户形成离子偶极和氢键相互作用，从而形成手性一维柱状组装体。
