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Synthesis, Electronic Spectra and Solvent-Induced Reversible Dissociation of Diphosphine(hexafluoroacetylacetonato)copper(I) Complexes
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Valeri Pawlowski
Published/Copyright:
June 2, 2014
The complexes CuI(P-P)(hfac) with P-P = 1,2-bis(diphenylphosphino)ethane (diphos), 1,3-bis-(diphenylphosphino)propane (prophos), 2,2’-bis(diphenylphosphino)-1,1’-binaphthyl (binap) and hfac = hexafluoroacetylacetonate were synthesized and spectroscopically characterized. In the solid state or in solutions of non-polar solvents these compounds are yellow owing to a long-wavelength (hfac− →P-P) ligand-to-ligand charge transfer absorption. In coordinating solvents such as CH3CN the complexes undergo a reversible dissociation according to the equation:
Cu(P-P)(hfac) + n CH3CN ⇌ [Cu(P-P)(CH3CN)n]+hfac−.
While the complexes are not luminescent the ion pairs [Cu(P-P)(CH3CN)n]+hfac− are emissive at 77 K. The cations and the anions show separate emissions as indicated by the excitation spectra.
Received: 2003-7-11
Published Online: 2014-6-2
Published in Print: 2003-10-1
© 1946 – 2014: Verlag der Zeitschrift für Naturforschung
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Keywords for this article
Electronic Spectra;
Luminescence;
Copper Complexes;
β -Diketonate Complexes
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