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A series of oligo(<jats:italic>p<\/jats:italic>\u2010phenylene ethynylene)s (<jats:bold>OPE<\/jats:bold>s) with different conjugated chain lengths as energy donor subunit in the energy\u2010transfer system were capped at both ends with BODIPY chromophores as energy\u2010acceptor subunits. The effect of the conjugated chain of <jats:bold>OPE<\/jats:bold>s on energy transfer in the <jats:bold>OPEB<\/jats:bold> cassettes was investigated by UV\/Vis and fluorescence spectroscopy and modeling. With increasing number <jats:italic>n<\/jats:italic> of phenyl acetylene units (<jats:italic>n<\/jats:italic>=1\u20137), the absorption and emission maxima of <jats:bold>OPE<jats:italic>n<\/jats:italic><\/jats:bold> are bathochromically shifted. In the <jats:bold>OPEB<jats:italic>n<\/jats:italic><\/jats:bold> analogues, the absorption maximum assigned to the BODIPY moieties is independent of the length of the <jats:bold>OPE<\/jats:bold> spacer. However, the relative absorption intensity of the BODIPY band decreases when the number of phenyl acetylene units is increased. The emission spectra of <jats:bold>OPEB<jats:italic>n<\/jats:italic><\/jats:bold> are dominated by a band peaking at 613\u2005nm, corresponding to emission of the BODIPY moieties, regardless of whether excitation is at 420 or 550\u2005nm. Furthermore, a very small band is observed with a maximum between 450 and 500\u2005nm, and its intensity relative to that of the BODIPY emission increases with increasing <jats:italic>n<\/jats:italic>, that is, the excited state of <jats:bold>OPE<\/jats:bold> subunits is efficiently quenched in <jats:bold>OPEB<jats:italic>n<\/jats:italic><\/jats:bold> by energy transfer to the BODIPY moieties. Energy transfer (ET) from <jats:bold>OPE<jats:italic>n<\/jats:italic><\/jats:bold> to BODIPY in <jats:bold>OPEB<jats:italic>n<\/jats:italic><\/jats:bold> is very efficient (all <jats:italic>\u03a6<\/jats:italic><jats:sub>ET<\/jats:sub> values are greater than 98\u2009%) and only slightly decreases with increasing length of the <jats:bold>OPE<\/jats:bold> units. These results are supported by theoretical studies that show very high energy transfer efficiency (<jats:italic>\u03a6<\/jats:italic><jats:sub>ET<\/jats:sub>&gt;75\u2009%) from the <jats:bold>OPE<\/jats:bold> spacer to the BODIPY end\u2010groups for chains with up to 15\u201320 units.<\/jats:p>","DOI":"10.1002\/chem.201100454","type":"journal-article","created":{"date-parts":[[2011,10,11]],"date-time":"2011-10-11T10:18:41Z","timestamp":1318328321000},"page":"13247-13257","source":"Crossref","is-referenced-by-count":40,"title":["Oligo(<i>p<\/i>\u2010phenylene ethynylene)\u2013BODIPY Derivatives: Synthesis, Energy Transfer, and Quantum\u2010Chemical Calculations"],"prefix":"10.1002","volume":"17","author":[{"given":"Shouchun","family":"Yin","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Volker","family":"Leen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Carine","family":"Jackers","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Beljonne","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Bernard","family":"Van\u2005Averbeke","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mark","family":"Van\u2005der\u2005Auweraer","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"No\u00ebl","family":"Boens","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wim","family":"Dehaen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,10,11]]},"reference":[{"key":"e_1_2_6_1_2","unstructured":"\u00a0"},{"key":"e_1_2_6_2_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr941193"},{"key":"e_1_2_6_3_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr040084k"},{"key":"e_1_2_6_4_2","doi-asserted-by":"publisher","DOI":"10.1039\/B607187B"},{"key":"e_1_2_6_5_2","doi-asserted-by":"publisher","DOI":"10.1146\/annurev.physchem.040808.090259"},{"key":"e_1_2_6_6_2","unstructured":"\u00a0"},{"key":"e_1_2_6_7_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr078381n"},{"key":"e_1_2_6_8_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200702070"},{"key":"e_1_2_6_8_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200702070"},{"key":"e_1_2_6_9_2","unstructured":"\u00a0"},{"key":"e_1_2_6_10_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200304754"},{"key":"e_1_2_6_11_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200500373"},{"key":"e_1_2_6_12_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja0631448"},{"key":"e_1_2_6_13_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol061601j"},{"key":"e_1_2_6_14_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol0627404"},{"key":"e_1_2_6_15_2","doi-asserted-by":"publisher","DOI":"10.1021\/jo060984w"},{"key":"e_1_2_6_16_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200801384"},{"key":"e_1_2_6_17_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol800560b"},{"key":"e_1_2_6_18_2","doi-asserted-by":"publisher","DOI":"10.1002\/chem.200802477"},{"key":"e_1_2_6_19_2","doi-asserted-by":"publisher","DOI":"10.1021\/jo702066v"},{"key":"e_1_2_6_20_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol8023677"},{"key":"e_1_2_6_21_2","unstructured":"\u00a0"},{"key":"e_1_2_6_22_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja9812047"},{"key":"e_1_2_6_23_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja001031x"},{"key":"e_1_2_6_24_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar970264z"},{"key":"e_1_2_6_25_2","doi-asserted-by":"publisher","DOI":"10.1021\/jo025561i"},{"key":"e_1_2_6_26_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol050033p"},{"key":"e_1_2_6_27_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol061110z"},{"key":"e_1_2_6_28_2","doi-asserted-by":"publisher","DOI":"10.1039\/b821630d"},{"key":"e_1_2_6_29_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja030647u"},{"key":"e_1_2_6_30_2","unstructured":"\u00a0"},{"key":"e_1_2_6_31_2","doi-asserted-by":"publisher","DOI":"10.1039\/b006769p"},{"key":"e_1_2_6_32_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200500970"},{"key":"e_1_2_6_32_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200500970"},{"key":"e_1_2_6_33_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja066144g"},{"key":"e_1_2_6_34_2","doi-asserted-by":"publisher","DOI":"10.1021\/ol702381j"},{"key":"e_1_2_6_35_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja9015364"},{"key":"e_1_2_6_36_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja9038856"},{"key":"e_1_2_6_37_2","unstructured":"\u00a0"},{"key":"e_1_2_6_38_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar0000612"},{"key":"e_1_2_6_39_2","doi-asserted-by":"publisher","DOI":"10.1021\/cr990257j"},{"key":"e_1_2_6_40_2","doi-asserted-by":"publisher","DOI":"10.1021\/ar010092c"},{"key":"e_1_2_6_41_2","doi-asserted-by":"publisher","DOI":"10.1002\/ange.200461146"},{"key":"e_1_2_6_41_3","doi-asserted-by":"publisher","DOI":"10.1002\/anie.200461146"},{"key":"e_1_2_6_42_2","unstructured":"\u00a0"},{"key":"e_1_2_6_43_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja020380j"},{"key":"e_1_2_6_44_2","doi-asserted-by":"publisher","DOI":"10.1039\/B510234K"},{"key":"e_1_2_6_45_2","doi-asserted-by":"publisher","DOI":"10.1002\/ejoc.200600103"},{"key":"e_1_2_6_46_2","doi-asserted-by":"publisher","DOI":"10.1021\/ja8040493"},{"key":"e_1_2_6_47_2","doi-asserted-by":"publisher","DOI":"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