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The X\u2010ray structure of the [2\u2010(<jats:italic>p<\/jats:italic>\u2010tolyl)ethynyl][4\u2010{2\u2010(<jats:italic>p<\/jats:italic>\u2010tolyl)ethynyl}\u20106\u2010phenyl\u20102,2\u2032\u2010bipyridyl)]platinum(II) complex revealed a coplanar arrangement of all residues bound to platinum, although the tolylethynyl groups exhibit position\u2010dependent bending in the solid state. The complexes exhibit charge\u2010transfer absorption in the visible region. All except two of the complexes also exhibit charge\u2010transfer emission, typically from an excited state that has a submicrosecond lifetime at room temperature in deoxygenated dichloromethane solution. In accordance with the presence of a carbometalated polypyridine ligand, the emitting state is assumed to have a mixture of metal\u2010to\u2010ligand charge\u2010transfer (MLCT) and intra\u2010ligand charge\u2010transfer (ILCT) character. However, spectral comparisons and electrochemical data suggest that the emissive state also exhibits interligand charge\u2010transfer (LLCT) character when an electron\u2010rich ethynylaryl group is bound to platinum. In keeping with altered orbital parentage in the latter systems, the emission occurs at longer wavelength. The excited\u2010state lifetime is also shorter, evidently due to vibronic interactions. The decay is so efficient when an ethynyltrialkoxygallate group binds to platinum that there is no detectable emission in fluid solution, although the complexes do emit in a frozen glass. The excited states are subject to associative (exciplex) quenching by Lewis bases, but the admixture of ILCT and\/or LLCT character diminishes efficiency, except for relatively strong bases like dimethyl sulfoxide and dimethylformamide.<\/jats:p>","DOI":"10.1002\/chem.200701975","type":"journal-article","created":{"date-parts":[[2008,7,5]],"date-time":"2008-07-05T19:22:16Z","timestamp":1215285736000},"page":"7168-7179","source":"Crossref","is-referenced-by-count":9,"title":["Spectroscopic Properties of Orthometalated Platinum(II) Bipyridine Complexes Containing Various Ethynylaryl Groups"],"prefix":"10.1002","volume":"14","author":[{"given":"Meaghan\u2005L.","family":"Clark","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"St\u00e9phane","family":"Diring","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pascal","family":"Retailleau","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"David\u2005R.","family":"McMillin","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Raymond","family":"Ziessel","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2008,8,6]]},"reference":[{"doi-asserted-by":"publisher","key":"e_1_2_7_1_2","DOI":"10.1016\/0010-8545(91)84019-2"},{"unstructured":"\u00a0","key":"e_1_2_7_2_2"},{"doi-asserted-by":"publisher","key":"e_1_2_7_3_2","DOI":"10.1016\/0010-8545(94)80027-8"},{"doi-asserted-by":"publisher","key":"e_1_2_7_4_2","DOI":"10.1016\/S0010-8545(98)90023-6"},{"doi-asserted-by":"publisher","key":"e_1_2_7_5_2","DOI":"10.1002\/ange.200604012"},{"doi-asserted-by":"publisher","key":"e_1_2_7_5_3","DOI":"10.1002\/anie.200604012"},{"unstructured":"\u00a0","key":"e_1_2_7_6_2"},{"doi-asserted-by":"publisher","key":"e_1_2_7_7_2","DOI":"10.1039\/B705062C"},{"doi-asserted-by":"publisher","key":"e_1_2_7_8_2","DOI":"10.1016\/j.ica.2006.08.061"},{"author":"Yam V. 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