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The host\u2013guest complex formation was studied in detail by using <jats:sup>1<\/jats:sup>H\u2005NMR, 2D NOESY, UV\/Vis fluorescence, and time\u2010resolved emission spectroscopy. The chloride salt of the TPA derivative was used for recognition studies with CB[7] and \u03b2\u2010CD in an aqueous medium. The restricted internal rotation of the guest molecule on complex formation with either of these two host molecules was reflected in the enhancement of the emission quantum yield and the average excited\u2010state lifetime for the triphenylamine\u2010based excited states. Studies with DB24C8 as the host molecule were performed in dichloromethane, a medium that maximizes the noncovalent interaction between the host and guest fragments. The F\u00f6rster resonance energy transfer (FRET) process involving DB24C8 and <jats:bold>1<\/jats:bold>(PF<jats:sub>6<\/jats:sub>)<jats:sub>3<\/jats:sub>, as the donor and acceptor fragments, respectively, was established by electrochemical, steady\u2010state emission, and time\u2010correlated single\u2010photon counting studies.<\/jats:p>","DOI":"10.1002\/chem.201103079","type":"journal-article","created":{"date-parts":[[2012,2,17]],"date-time":"2012-02-17T10:43:35Z","timestamp":1329475415000},"page":"3906-3917","source":"Crossref","is-referenced-by-count":30,"title":["Restricted Conformational Flexibility of a Triphenylamine Derivative on the Formation of Host\u2013Guest Complexes with Various Macrocyclic Hosts"],"prefix":"10.1002","volume":"18","author":[{"given":"Amal Kumar","family":"Mandal","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Moorthy","family":"Suresh","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Priyadip","family":"Das","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amitava","family":"Das","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,2,17]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","first-page":"1","volume-title":"Catenanes, Rotaxanes, and Knots","author":"Schill G.","year":"1971"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1002\/9780470511459"},{"key":"e_1_2_6_4_2","first-page":"137","volume-title":"Principles and Methods in Supramolecular Chemistry","author":"Schneider H.\u2010J.","year":"2000"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.progpolymsci.2005.07.003"},{"key":"e_1_2_6_6_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr900002h"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1007\/12_2008_1"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr9000622"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1039\/b807441k"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.2174\/157017910790820346"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1039\/B917901A"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.3390\/molecules15053709"},{"key":"e_1_2_6_13_2","unstructured":"\u00a0"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1039\/B809359H"},{"key":"e_1_2_6_15_2","unstructured":"\u00a0"},{"key":"e_1_2_6_16_2","first-page":"1","volume-title":"An Introduction to Hydrogen Bonding","author":"Jeffrey G. 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