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Structural characterization and photophysical properties of a luminescent trinuclear zinc(II) complex exhibiting multiple coordination geometries

机译:具有多个配位几何结构的发光三核锌(II)配合物的结构表征和光物理性质

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A luminescent trinuclear zinc(II) complex, tris(μ-2,3-toluenedithiolato)- 1: 2κS-2(1); 1: 2κS-2(1'), 2: 3κS-2(2); 3κ S-2', 1: 3κS-2(3); 3κ S-3'- bis(2,2'- bypyridine)- 1κN-2, N', 2κN-2, N'-trizinc, containing 3,4-dimercaptotoluene ( tdt) and 2,2'-bipyridine (bpy) has been synthesized and found to have the trinuclear formulation Zn-3(tdt)(3)(bpy)(2) ( I). The complex crystallizes in the monoclinic space group P2(1) with a = 11.7247( 12), b = 20.134( 2), c = 17.7376( 18) &ANGS; and β = 103.743( 2)°. The complex has two heteroleptic zinc( II) centers exhibiting similar distorted trigonal bipyramidal geometries with the third homoleptic zinc( II) center displaying a flattened tetrahedral geometry. Present in the solid state are both intra- and intermolecular π - π interactions. The complex is emissive at 77 K in the solid state with an emission maximum at 574 +/- 2 nm with a luminescence lifetime of 7.4 +/- 0.4 ns. The unstructured emission is assigned as a metal-mediated ligand-to-ligand π - π* charge transfer transition.
机译:一种发光的三核锌(II)络合物,三(μ-2,3-甲苯二硫代巯基乙酸)-1:2κS-2(1); 1:2κS-2(1'),2:3κS-2(2); 3κS-2',1:3κS-2(3); 3κS-3'-双(2,2'-吡啶)-1κN-2,N',2κN-2,N'-三嗪,含有3,4-二巯基甲苯(tdt)和2,2'-联吡啶(bpy )已合成,发现具有三核配方Zn-3(tdt)(3)(bpy)(2)(I)。该复合物在单斜空间群P2(1)/ n中结晶,其中a = 11.7247(12),b = 20.134(2),c = 17.7376(18)&ANGS;和β= 103.743(2)°。该配合物具有两个杂合的锌(II)中心,它们表现出相似的扭曲的三角双锥体几何形状,而第三个均化的锌(II)中心显示出扁平的四面体几何形状。固态和分子间π-π相互作用都存在。该复合物在固态以77 K发射,最大发射为574 +/- 2 nm,发光寿命为7.4 +/- 0.4 ns。非结构发射被指定为金属介导的配体到配体的π-π*电荷转移跃迁。

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