Ontology type: schema:ScholarlyArticle
2001-06
AUTHORSSari Kiviniemi, Maija Nissinen, Tanja Kolli, Jorma Jalonen, Kari Rissanen, Jouni Pursiainen
ABSTRACTCrown ether complexes of six-membered N-heteroaromatic cations and the closely related bicyclic purinium cation (6) have been studied by 1H NMR, mass spectrometric and crystallographic methods. The stability constants for the complexes were determined by 1H NMR titration in acetonitrile solution and the complexation stoichiometry by 1H NMR and ESI mass spectrometric methods. Altogether six crystal structures of complexes were determined to study the complexation in the solid state. Hydrogen bonding was observed to be the most important interaction for the complexation both in solution and in the solid state but π–π interactions also contribute to it. All crystal structures of the DB18C6 complexes with six-membered N-heteroaromatic cations, except for 4-hydroxypyridinium, are isomorphous to previously studied five-membered N-heteroaromatic cations and pyridinium complexes. Such a close resemblance is not observed in B18C6 and 18C6 complexes or DB18C6ċpurinium (6). More... »
PAGES153-159
http://scigraph.springernature.com/pub.10.1023/a:1011176602813
DOIhttp://dx.doi.org/10.1023/a:1011176602813
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