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Synthesis, Characterization, and Luminescent Properties of Dinuclear Gold(I) Xanthate Complexes: X-ray Structure of [Au2(nBu-xanthate)2]
 

Summary: Synthesis, Characterization, and Luminescent Properties of Dinuclear
Gold(I) Xanthate Complexes: X-ray Structure of [Au2(nBu-xanthate)2]
Ahmed A. Mohamed, Ibrahim Kani, Anna O. Ramirez, and John P. Fackler, Jr.*
Laboratory for Molecular Structure and Bonding, Department of Chemistry,
Texas A&M UniVersity, College Station, Texas 77843-3255
Received August 19, 2003
The synthesis and characterization of gold(I) complexes of butyl xanthate [Au2(n
Bu-xanthate)2], 1, and ethyl xanthate
[Au2(Et-xanthate)2], 2, are described. These complexes are readily prepared from the reaction between Au(THT)Cl
(THT ) tetrahydrothiophene) and the corresponding xanthate ligands as the potassium salts. The two xanthate
complexes are characterized by 1
H NMR, IR, mass spectrometry, elemental analysis, and UV-vis techniques.
Thermal gravimetric analysis (TGA) and differential thermal analysis (DTA) show that the gold xanthate complexes
decompose to yield mainly gold metal at 200 C, confirmed by X-ray powder diffraction. Excitation of the complexes
at 450 nm in the solid state at 77 K produces a strong red emission at ca. 690 nm with a broad asymmetric profile
tailing to 850 nm. The dinuclear gold(I) xanthate complex, [Au2(n
Bu-xanthate)2], 1, is the first structurally characterized
binary Au(I) xanthate. The Au,,,Au distance in the eight-membered ring is 2.8494(15) while the shortest
intermolecular Au,,,Au interaction between independent units is 3.64 . The angle between the planes containing
the molecules in the unit cell is 69.56. The light green plates of [Au(-S2COBun

  

Source: Abdou, Hanan E. - Department of Chemistry, Texas A&M University

 

Collections: Chemistry