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Assemblies of Alkaline‐Earth‐Metal Ions with o ‐Tetramethyl‐Substituted Cucurbituril in the Presence of the Cadmium Tetrachloride Anion
Author(s) -
Zhou JiaJia,
Yu Xin,
Zhao YingChun,
Xiao Xin,
Zhang YunQian,
Xue SaiFeng,
Tao Zhu,
Liu JingXin,
Zhu QianJiang
Publication year - 2014
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201402442
Subject(s) - chemistry , cucurbituril , denticity , dimer , aqueous solution , alkaline earth metal , ligand (biochemistry) , metal ions in aqueous solution , inorganic chemistry , ion , metal , crystallography , supramolecular chemistry , polymer chemistry , medicinal chemistry , organic chemistry , crystal structure , biochemistry , receptor
o ‐Tetramethyl‐substituted cucurbituril ( o ‐TMeQ[6]), a polydentate ligand, has been synthesized and isolated in a controlled manner by using a dimer of dimethyl‐substituted glycoluril and a dimer of unsubstituted glycoluril. Coordination assemblies have been investigated by reactions between alkaline earth cations and o ‐TMeQ[6] in the presence of [CdCl 4 ] 2– , a structure inducer, in HCl aqueous solution. X‐ray diffraction analysis revealed that o ‐TMeQ[6] coordinates with Ca 2+ or Sr 2+ and forms centrosymmetric tetranuclear assemblies in the presence of [CdCl 4 ] 2– . [CdCl 4 ] 2– typically produces the “honeycomb effect” by forming honeycomb‐like frameworks, which assist metal ions in coordinating to o ‐TMeQ[6]. The driving forces of this effect are the “outer‐surface interactions” of cucurbit[ n ]urils.