Anion channel structure through packing of cucurbit[5]uril-Pb²⁺ or cucurbit[5]uril-Hg²⁺ complexes

Abstract

Yao (2010) Anion channel structure through packing of cucurbit[5]uril-Pb 2+ or cucurbit[5]uril-Hg In this study, complexes {[Pb 4 (C 30 H 30 N 20 O 10 ) 2 Cl 2 ]Cl 2 (H 2 O) 2 }PbCl 6 Á 12H 2 O (1) and [Hg(C 30 H 30 N 20 O 10 )Cl 2 ]HgCl 2À 4 ðH 3 OÞ 2þ 2 Á 6H 2 O (2) have been synthesized and structurally characterized. Single-crystal X-ray diffraction analyses reveal that water-soluble toxic metal ions, Pb 2þ and Hg 2þ , can be chelated by cucurbit[5]uril to form molecular capsule and molecular bowl. Moreover, solid-state packing of these molecular capsule or molecular bowl shows the formation of a channel, in which octahedral [PbCl 6 ] 4À or tetrahedral [HgCl 4 ] 2À anions were encapsulated.

Molecular and supramolecular ionic aggregates HxOyzin organic and organometallic crystalline hydrates

“…Isomers 2 and 3 of H 13 O 6 + [DUWXAV ( Fig. 8b; Liu et al, 2010) and IHEJOU ( Fig. 8c; Choi et al, 2002)] feature central Zundel ions.…”

Simple Coordination Complexes of Cucurbit[n]urils with Metal Ions

“…Nevertheless, there are other factors that could lead to the formation of Q [5]s with metal ions with a smaller radius, such as Hg 2+ (0.69 Å) [21]. In recent years, there has been a trend toward the use of third species as structure directing agents in Q[n]-metal systems, and the driving forces could be the so-called outer surface interactions of Q[n]s [22].…”