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These dyes are equipped with ancillary 2,2\u2032:6\u2032,2\u2033\u2010terpyridine (terpy) residues, attached either at the B centre or at the <jats:italic>meso<\/jats:italic> position of the organic framework; in this latter case two ethynylated pyrene units are bound to the B atom. Under most experimental conditions, the absorption and emission spectral properties are typical of this class of dye. Complexation of zinc(II) cations to the terpy units attached at the B centre causes complete extinction of the fluorescence due to intramolecular electron transfer from the excited state dye to the resultant zinc(II) bis\u2010terpy complex. Similar behaviour is noted when the terpy is attached at the <jats:italic>meso<\/jats:italic> site, although the rate of electron transfer is slower due to the weaker driving force. A most unusual feature of the pyrene\u2010substituted dye is its facile self association in acetonitrile solution. This results in the reversible formation of a fluorescent associate, believed to be a symmetric dimer, that absorbs and emits to the red of the monomer. Self association is considered to be driven by a solvophobic effect in which the pyrene units seek to minimize surface contact with the surrounding solvent molecules.(\u00a9 Wiley\u2010VCH Verlag GmbH &amp; Co. KGaA, 69451 Weinheim, Germany, 2007)<\/jats:p>","DOI":"10.1002\/ejoc.200700190","type":"journal-article","created":{"date-parts":[[2007,5,10]],"date-time":"2007-05-10T08:49:54Z","timestamp":1178786994000},"page":"3191-3198","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Boron Dipyrromethene Dyes Bearing Ancillary 2,2\u2032:6\u2032,2\u2033\u2010Terpyridine Coordination Sites"],"prefix":"10.1002","volume":"2007","author":[{"given":"Anthony","family":"Harriman","sequence":"first","affiliation":[]},{"given":"Laura J.","family":"Mallon","sequence":"additional","affiliation":[]},{"given":"Beverly","family":"Stewart","sequence":"additional","affiliation":[]},{"given":"Gilles","family":"Ulrich","sequence":"additional","affiliation":[]},{"given":"Raymond","family":"Ziessel","sequence":"additional","affiliation":[]}],"member":"311","published-online":{"date-parts":[[2007,6,18]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1038\/25954"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1126\/science.290.5493.963"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature04645"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1038\/347539a0"},{"key":"e_1_2_6_6_2","unstructured":"\u00a0"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1521-3773(19980703)37:12<1717::AID-ANIE1717>3.0.CO;2-T"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1521-3773(19981217)37:23<3249::AID-ANIE3249>3.0.CO;2-S"},{"key":"e_1_2_6_9_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja982786v"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1521-3773(20000515)39:10<1777::AID-ANIE1777>3.0.CO;2-E"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja001308t"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20010119)40:2<402::AID-ANIE402>3.0.CO;2-I"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1007\/3-540-45010-6_6"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja0200847"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1002\/1521-3773(20020415)41:8<1416::AID-ANIE1416>3.0.CO;2-2"},{"key":"e_1_2_6_16_2","doi-asserted-by":"publisher","DOI":"10.1021\/ic010338"},{"key":"e_1_2_6_17_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr960386p"},{"key":"e_1_2_6_18_2","unstructured":"J.\u2010P. 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