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Chem."},{"key":"ref29\/cit29","unstructured":"The hypothesis is currently under investigation with differently sized guests, and the results will be reported in due course."},{"key":"ref30\/cit30a","doi-asserted-by":"crossref","first-page":"11732","DOI":"10.1021\/ja063413u","volume":"128","author":"Jiang X.","year":"2006","journal-title":"J. Am. Chem. Soc."},{"key":"ref30\/cit30b","doi-asserted-by":"crossref","first-page":"7019","DOI":"10.1002\/anie.200701410","volume":"46","author":"Riddle J. A.","year":"2007","journal-title":"Angew. Chem., Int. Ed."},{"key":"ref30\/cit30c","doi-asserted-by":"crossref","first-page":"417","DOI":"10.1039\/b715673c","volume":"133","author":"Riddle J. A.","year":"2008","journal-title":"Analyst"},{"key":"ref31\/cit31","unstructured":"Other scenarios acting in the exchange of guests cannot be ignored; for example, another mechanistic possibility is the rotation of one pyridyl arm versus the motion of all three arms. Each postulated mechanism may be a function of the guest characteristics and will certainly benefit from additional experimental scrutiny. In this study, however, IR spectroscopy showed that the N\u2212H hydrogen-bonding pattern was dominated by intramolecular HBs, and little evidence was seen for a free pyridyl arm. Calculations are in support of this observation. Moreover, preliminary results of our molecular dynamics (MD) and steered molecular dynamics simulations with the Amber suite of programs indicate the rupture of all three N\u2212H-N hydrogen bonds occurs in the removal of CCl4from the interior of1. Experimental and computational studies are in progress to reveal mechanistic details. See also:"},{"key":"ref31\/cit31a","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1039\/B603168B","volume":"36","author":"Pluth M. D.","year":"2007","journal-title":"Chem. Soc. 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