Structural characterization and photophysical properties of a luminescent trinuclear zinc(II) complex exhibiting multiple coordination geometries |
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Authors: | Dana M Hatch William F Wacholtz Joel T Mague |
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Institution: | (1) Department of Chemistry, University of Wisconsin Oshkosh, Oshkosh, Wisconsin, 54904;(2) Department of Chemistry, Tulane University, New Orleans, Louisiana, 70118 |
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Abstract: | A luminescent trinuclear zinc(II) complex, tris( -2,3-toluenedithiolato)-1:2 2S1;1:2 2S1 , 2:3 2S2;3 S2 , 1:3 2S3;3 S3 -bis(2,2 -bypyridine)-1 2N,N ,2 2N,N -trizinc, containing 3,4-dimercaptotoluene (tdt) and 2,2 -bipyridine (bpy) has been synthesized and found to have the trinuclear formulation Zn3(tdt)3(bpy)2 (I). The complex crystallizes in the monoclinic space group P21/n with a = 11.7247(12), b = 20.134(2), c = 17.7376(18) Å and = 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 – 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 – * charge transfer transition. |
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Keywords: | Zinc trinuclear dithiolate luminescent |
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