CHEMICAL BONDING BETWEEN Ar/Kr And Au: FTMW SPECTRA, GEOMETRICS AND HYPERFINE CONSTANTS OF THE COMPLEXES Ar-AuX (X=F, Cl, Br) AND Kr-AuCl.

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 Title: CHEMICAL BONDING BETWEEN Ar/Kr And Au: FTMW SPECTRA, GEOMETRICS AND HYPERFINE CONSTANTS OF THE COMPLEXES Ar-AuX (X=F, Cl, Br) AND Kr-AuCl. Creators: Evans, Corey J.; Rubinoff, Daryl S.; Gerry, Michael C. L.; Lesarri, Alberto Issue Date: 2000 Publisher: Ohio State University Abstract: The microwave rotational spectra of Ar-AuX(X=F,Cl,Br) and of Kr-AuCl were measured in the 5-22 GHz range using a cavity pulsed-jet Fourier transform microwave spectrometer. All complexes were found to be linear and rather rigid. Ground slate effective ($r_{0}$) geometries were found for all complexes, white for Kr-AuCl a substitution ($r_{s}$) structure was obtained. The Ar-Au distance ranges from 2.39 to 2.50 {\AA} in going from Ar-AuF to Ar-AuBr while for Kr-AuCl, the Kr-Au distance is 2.52{\AA}. The Au nuclear quadrupole coupling constant was found to change radically on complex formation. For Ar-AuCl, $eQq(Au)=-259.8$ MHz while for Kr-AuCl, eQq(Au)=349.7 MHz, is in contrast with that of monomeric AuCl where eQq(Au)=+9.6 MHz. Ab initio calculations at the MP2 level of theory predict a Ar-Au bond energy of $46 k mol^{-1}$ for Ar-AuCl with a transfer of 0.1 electrons from Ar to Au, while for Kr-AuCl the bond energy is $71 kJ mol^{-1}$ with a transfer of 0.2 electrons from Kr to Au. The whole picture is consistent with weak Ng-Au covalent bonding. Description: Author Institution: Department of Chemistry, University of British Columbia; Departmento de Qu\'imica F\'isica, Facultad de Ciencias, Universidad de Valladolid URI: http://hdl.handle.net/1811/19932 Other Identifiers: 2000-WE-10