{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T16:00:05Z","timestamp":1791216005904,"version":"4.1.0"},"reference-count":37,"publisher":"Wiley","issue":"31","license":[{"start":{"date-parts":[[2011,6,16]],"date-time":"2011-06-16T00:00:00Z","timestamp":1308182400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Chemistry A European J"],"published-print":{"date-parts":[[2011,7,25]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Significant aggregation is observed in pyrene\u2010modified zero\u2010 and first\u2010generation polyamidoamine (PAMAM) dendrimers above their critical aggregation concentration (CAC, &gt;10<jats:sup>\u22126<\/jats:sup>\u2009<jats:sc>M<\/jats:sc>). The pyrene units are attached to the dendrimer skeleton through imine bonds, which play a pivotal role in enhancing the aggregation propensity of the PAMAM dendrimers. Scanning electron microscopy studies suggest that pyrene\u2010modified PAMAM dendrimers aggregate into doughnut\u2010shaped assemblies. As a result of aggregation, the pyrene chromophores are pre\u2010arranged in a face\u2010to\u2010face geometry in the ground state, and readily generate pyrene \u201cstatic excimer\u201d on photoexcitation. The static pyrene excimer emits with an unprecedented quantum yield of 0.62\u00b10.01 in dichloromethane, and also exhibits remarkable positive solvatochromism from 498 to 638\u2005nm, which leads to the highest bathochromic shift for pyrene excimer emission in solution reported so far. Lippert\u2013Mataga analysis of the system suggests that general and specific solvent effects play a crucial role in the positive solvatochromism exhibited by the system. Luminescence quenching studies on both monomer and aggregate systems were carried out in the presence of various metal ions, and the results imply that pyrene\u2010modified PAMAM dendrimer can be utilized for selective detection of Hg ions in the presence of a wide variety of transition, alkali, and alkaline earth metal ions. This report presents the first dendrimer\u2010based chromophoric system exhibiting positive solvatochromism over a range of 140\u2005nm, and shows that pyrene\u2010modified PAMAM dendrimers can be effectively utilized to generate wavelength\u2010tunable emitting systems displaying bluish green, greenish yellow, and orange\u2010red colors at room temperatures.<\/jats:p>","DOI":"10.1002\/chem.201100116","type":"journal-article","created":{"date-parts":[[2011,6,17]],"date-time":"2011-06-17T16:03:30Z","timestamp":1308326610000},"page":"8609-8617","source":"Crossref","is-referenced-by-count":52,"title":["Tunable Emission of Static Excimer in a Pyrene\u2010Modified Polyamidoamine Dendrimer Aggregate through Positive Solvatochromism"],"prefix":"10.1002","volume":"17","author":[{"given":"P. K.","family":"Lekha","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Edamana","family":"Prasad","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,6,16]]},"reference":[{"key":"e_1_2_5_1_2","doi-asserted-by":"publisher","DOI":"10.1002\/3527600612"},{"key":"e_1_2_5_2_2","doi-asserted-by":"publisher","DOI":"10.1002\/9783527626953"},{"key":"e_1_2_5_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr900174j"},{"key":"e_1_2_5_4_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr900186c"},{"key":"e_1_2_5_5_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200901597"},{"key":"e_1_2_5_6_2","doi-asserted-by":"publisher","DOI":"10.1039\/B300100H"},{"key":"e_1_2_5_7_2","doi-asserted-by":"publisher","DOI":"10.1039\/b908675g"},{"key":"e_1_2_5_8_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr900327d"},{"key":"e_1_2_5_9_2","doi-asserted-by":"publisher","DOI":"10.1039\/b615196e"},{"key":"e_1_2_5_10_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol901392p"},{"key":"e_1_2_5_11_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol070143r"},{"key":"e_1_2_5_12_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol8006474"},{"key":"e_1_2_5_13_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma001379c"},{"key":"e_1_2_5_14_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja048219r"},{"key":"e_1_2_5_15_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200801379"},{"key":"e_1_2_5_16_2","doi-asserted-by":"publisher","DOI":"10.1002\/pola.22612"},{"key":"e_1_2_5_17_2","doi-asserted-by":"publisher","DOI":"10.1021\/ma0498215"},{"key":"e_1_2_5_18_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200500638"},{"key":"e_1_2_5_19_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja806747h"},{"key":"e_1_2_5_20_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol052508i"},{"key":"e_1_2_5_21_2","doi-asserted-by":"publisher","DOI":"10.1039\/b600009f"},{"key":"e_1_2_5_22_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol060767h"},{"key":"e_1_2_5_23_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.tetlet.2009.03.110"},{"key":"e_1_2_5_24_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200902391"},{"key":"e_1_2_5_25_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol1007636"},{"key":"e_1_2_5_26_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr030666m"},{"key":"e_1_2_5_27_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1099-1395(199705)10:5<254::AID-POC875>3.0.CO;2-3"},{"key":"e_1_2_5_28_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja017637i"},{"key":"e_1_2_5_29_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.19951072105"},{"key":"e_1_2_5_29_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.199523111"},{"key":"e_1_2_5_30_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr00018a001"},{"key":"e_1_2_5_31_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol051609d"},{"key":"e_1_2_5_32_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol800475d"},{"key":"e_1_2_5_33_2","doi-asserted-by":"publisher","DOI":"10.1021\/ic9022008"},{"key":"e_1_2_5_34_2","doi-asserted-by":"publisher","DOI":"10.1023\/A:1020536918438"},{"key":"e_1_2_5_35_2","doi-asserted-by":"publisher","DOI":"10.1007\/978-0-387-46312-4"},{"key":"e_1_2_5_36_2","volume-title":"Molecular Fluorescence: Principles and Applications","author":"Valeur B.","year":"2002"}],"container-title":["Chemistry \u2013 A European Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/api.wiley.com\/onlinelibrary\/tdm\/v1\/articles\/10.1002%2Fchem.201100116","content-type":"unspecified","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/pdf\/10.1002\/chem.201100116","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T19:39:17Z","timestamp":1760297957000},"score":1,"resource":{"primary":{"URL":"https:\/\/chemistry-europe.onlinelibrary.wiley.com\/doi\/10.1002\/chem.201100116"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2011,6,16]]},"references-count":37,"journal-issue":{"issue":"31","published-print":{"date-parts":[[2011,7,25]]}},"alternative-id":["10.1002\/chem.201100116"],"URL":"https:\/\/doi.org\/10.1002\/chem.201100116","archive":["Portico"],"relation":{},"ISSN":["0947-6539","1521-3765"],"issn-type":[{"value":"0947-6539","type":"print"},{"value":"1521-3765","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011,6,16]]}}}