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Transmission electron microscopy imaging revealed that the average diameter of the particles was approximately 4\u2005nm both before and after attachment of the receptor to the surface. The calix[4]pyrrole\u2010functionalized nanoparticles exhibited highly elevated sensing behavior (approximately 1000 times in dichloromethane) relative to its monomeric congener while maintaining its guest selectivity. The receptor\u2013nanoparticle conjugate (nanoreceptor) showed significant aggregation upon addition of the biphenolate anion, an effect ascribed to anion\u2010mediated interparticle linking. The receptor\u2013nanoparticle conjugate is also capable of extracting the fluoride anion (as its tetrabutylammonium salt) from an aqueous layer to an organic medium. Control experiments revealed that this extraction is not possible when using the analogous monomeric receptor.<\/jats:p>","DOI":"10.1002\/chem.201300472","type":"journal-article","created":{"date-parts":[[2013,4,9]],"date-time":"2013-04-09T10:51:29Z","timestamp":1365504689000},"page":"5860-5867","source":"Crossref","is-referenced-by-count":34,"title":["Decoration of Gold Nanoparticles by a Double\u2010Armed Calix[4]pyrrole: A Receptor\u2010Decorated Nanoensemble for Anion Sensing and Extraction"],"prefix":"10.1002","volume":"19","author":[{"given":"Punidha","family":"Sokkalingam","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Seong\u2010Jin","family":"Hong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Abdullah","family":"Aydogan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathan L.","family":"Sessler","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chang\u2010Hee","family":"Lee","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2013,4,9]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","volume-title":"Anion Receptor Chemistry (Monographs in Supramolecular Chemistry)","author":"Sessler J. 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