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Coordination of Alkaline‐Earth Metal Ions in Inverted Cucurbit[6]uril Supramolecular Assemblies Formed in the Presence of Tetrachloride Zincates
Author(s) -
Zhang DeQing,
Sun Tao,
Zhang YunQian,
Xue SaiFeng,
Zhu QianJiang,
Zhang JianXin,
Tao Zhu
Publication year - 2015
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.201402932
Subject(s) - chemistry , supramolecular chemistry , alkaline earth metal , zincate , aqueous solution , tetrachloride , crystallography , metal , metal ions in aqueous solution , coordination complex , inorganic chemistry , crystal structure , zinc , organic chemistry , tin
Coordination in supramolecular assemblies in aqueous HCl solutions was investigated by reacting alkaline‐earth cations (AE 2+ ) and inverted cucurbit[6]uril ( i Q[6]) in the presence of the structure‐directing agent, tetrachloride zincate ion. Single‐crystal X‐ray diffraction analysis revealed that the i Q[6]–Mg 2+ –[ZnCl 4 ] 2– –HCl interaction system yielded a supramolecular assembly of i Q[6] and [ZnCl 4 ] 2– without forming coordination complexes of Mg 2+ or Zn 2+ with i Q[6]. In contrast, interaction of Ca 2+ or Sr 2+ with i Q[6] in the presence of [ZnCl 4 ] 2– gave rise to linear coordination polymers, which formed a honeycomb‐like framework in which the linear polymers occupy cells of the framework. The i Q[6]–Ba 2+ –[ZnCl 4 ] 2– –HCl interaction system immediately produced precipitates, thus preventing isolation of single crystals under similar synthetic conditions.