Phosphorescence vs Fluorescence in Cyclometalated Platinum(II) and Iridium(III) Complexes of (Oligo)thienylpyridines
作者:Dmitry N. Kozhevnikov、Valery N. Kozhevnikov、Marsel Z. Shafikov、Anton M. Prokhorov、Duncan W. Bruce、J. A. Gareth Williams
DOI:10.1021/ic200210e
日期:2011.4.18
2′′-ter-thiophene, HL3, bind to platinum(II) and iridium(III) as N∧C-coordinating ligands, cyclometallating at position C4 in the thiophene ring adjacent to the pyridine, leaving a chain of either one or two pendent thiophenes. The synthesis of complexes of the form [PtLn(acac)] and [Ir(Ln)2(acac)] (n = 2 or 3) is described. The absorption and luminescence properties of these four new complexes are compared with
两个新制备的低聚吡啶基吡啶,5-(2-吡啶基)-5'-十二烷基-2,2'-联噻吩HL 2和5-(2-吡啶基)-5''-十二烷基-2,2':5' ,2'' -叔-噻吩,HL 3,结合铂(II)和铱(III)作为N∧C -coordinating配体,在位置C环金属化4在邻近吡啶噻吩环,留下的链要么一或两个悬垂的噻吩。描述了[PtL n(acac)]和[Ir(L n)2(acac)](n = 2或3)形式的复合物的合成。将这四种新配合物的吸收和发光特性与已知配合物的行为进行比较[PtL 1(acac)]和[Ir(L 1)2(acac)] HL 1 = 2-(2-噻吩基)吡啶},并借助时间依赖性密度泛函理论(TD -DFT)计算。鉴于[PtL 1(acac)]从混合ππ* / MLCT特性的三重态仅显示强烈的磷光,而[PtL 2(acac)]和[PtL 3(acac)]较弱,呈红色强烈移动,并