Source:http://linkedlifedata.com/resource/pubmed/id/12785855
| Subject | Predicate | Object | Context |
|---|---|---|---|
| pubmed-article:12785855 | rdf:type | pubmed:Citation | lld:pubmed |
| pubmed-article:12785855 | lifeskim:mentions | umls-concept:C0108171 | lld:lifeskim |
| pubmed-article:12785855 | lifeskim:mentions | umls-concept:C1521970 | lld:lifeskim |
| pubmed-article:12785855 | lifeskim:mentions | umls-concept:C0220781 | lld:lifeskim |
| pubmed-article:12785855 | lifeskim:mentions | umls-concept:C1883254 | lld:lifeskim |
| pubmed-article:12785855 | lifeskim:mentions | umls-concept:C0678594 | lld:lifeskim |
| pubmed-article:12785855 | pubmed:issue | 20 | lld:pubmed |
| pubmed-article:12785855 | pubmed:dateCreated | 2003-6-5 | lld:pubmed |
| pubmed-article:12785855 | pubmed:abstractText | The synthesis, complete characterization, and solid state structural and solution conformation determination of calix[n]arenes (n = 4, 6, 8) is reported. A complete series of X-ray structures of the alkali metal salts of calix[4]arene (HC4) illustrate the great influence of the alkali metal ion on the solid state structure of calixanions (e.g., the Li salt of monoanionic HC4 is a monomer; the Na salt of monoanionic HC4 forms a dimer; and the K, Rb, and Cs salts exist in polymeric forms). Solution NMR spectra of alkali metal salts of monoanionic calix[4]arenes indicate that they have the cone conformation in solution. Variable-temperature NMR spectra of salts HC4.M (M = Li, Na, K, Rb, Cs) show that they possess similar coalescence temperatures, all higher than that of HC4. Due to steric hindrance from tert-butyl groups in the para position of p-tert-butylcalix[4]arene (Bu(t)C4), the alkali metal salts of monoanionic Bu(t)C4 exist in monomeric or dimeric form in the solid state. Calix[6]arene (HC6) and p-tert-butylcalix[6]arene (Bu(t)C6) were treated with a 2:1 molar ratio of M(2)CO(3) (M = K, Rb, Cs) or a 1:1 molar ratio of MOC(CH(3))(3) (M = Li, Na) to give calix[6]arene monoanions, but calix[6]arenes react in a 1:1 molar ratio with M(2)CO(3) (M = K, Rb, Cs) to afford calix[6]arene dianions. Calix[8]arene (HC8) and p-tert-butylcalix[8]arene (Bu(t)()C8) have similar reactivity. The alkali metal salts of monoanionic calix[6]arenes are more conformationally flexible than the alkali metal salts of dianionic calix[6]arenes, which has been shown by their solution NMR spectra. X-ray crystal structures of HC6.Li and HC6.Cs indicate that the size of the alkali metal has some influence on the conformation of calixanions; for example, HC6.Li has a cone-like conformation, and HC6.Cs has a 1,2,3-alternate conformation. The calix[6]arene dianions show roughly the same structural architecture, and the salts tend to form polymeric chains. For most calixarene salts cation-pi arene interactions were observed. | lld:pubmed |
| pubmed-article:12785855 | pubmed:language | eng | lld:pubmed |
| pubmed-article:12785855 | pubmed:journal | http://linkedlifedata.com/r... | lld:pubmed |
| pubmed-article:12785855 | pubmed:status | PubMed-not-MEDLINE | lld:pubmed |
| pubmed-article:12785855 | pubmed:month | May | lld:pubmed |
| pubmed-article:12785855 | pubmed:issn | 0002-7863 | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:RheingoldArno... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:IncarvitoChri... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:ZakharovLev... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:GutscheC... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:HannaTracy... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:LiuLihuaL | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:EjsmontKrzysz... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:WatsonWilliam... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:Angeles-BozaA... | lld:pubmed |
| pubmed-article:12785855 | pubmed:author | pubmed-author:KouXiaodiX | lld:pubmed |
| pubmed-article:12785855 | pubmed:issnType | lld:pubmed | |
| pubmed-article:12785855 | pubmed:day | 21 | lld:pubmed |
| pubmed-article:12785855 | pubmed:volume | 125 | lld:pubmed |
| pubmed-article:12785855 | pubmed:owner | NLM | lld:pubmed |
| pubmed-article:12785855 | pubmed:authorsComplete | Y | lld:pubmed |
| pubmed-article:12785855 | pubmed:pagination | 6228-38 | lld:pubmed |
| pubmed-article:12785855 | pubmed:dateRevised | 2003-11-4 | lld:pubmed |
| pubmed-article:12785855 | pubmed:year | 2003 | lld:pubmed |
| pubmed-article:12785855 | pubmed:articleTitle | Synthesis, structures, and conformational characteristics of calixarene monoanions and dianions. | lld:pubmed |
| pubmed-article:12785855 | pubmed:affiliation | Department of Chemistry, Texas Christian University, Box 298860, Fort Worth 76129, USA. t.hanna@tcu.edu | lld:pubmed |
| pubmed-article:12785855 | pubmed:publicationType | Journal Article | lld:pubmed |