Synthesis, spectroscopic studies and structure of gold(III) chloride compounds of heterocyclic N-oxide diadducts revealing short hydrogen bond
[Thesis]
S. A. A. Al-Hamoud
King Fahd University of Petroleum and Minerals (Saudi Arabia)
1985
116
M.S.
King Fahd University of Petroleum and Minerals (Saudi Arabia)
1985
The present study deals with the synthesis and structure elucidation of several novel gold(III) chloride compounds having general formula (H(R-usd\rm pyNO)\sb2\rbrack\lbrack AuCl\sb4\rbrackusd where R = 2-Me, 3-Me, 4-Me, 2,6-(CH3)\sb2, p-NO2 and m-COOH. The three-dimensional single crystal x-ray structure analysis was completed on three compounds, namely, (H(2-usd\rm picNO)\sb2\rbrack\lbrack AuCl\sb4\rbrack,usd (H(3-usd\rm picNO)\sb2\rbrack\lbrack AuCl\sb2\rbrackusd and (H(4-usd\rm picNO)\sb2\rbrack\lbrack AuCl\sb4\rbrack.usd In all compounds the short hydrogen bonded dimeric cation was stabilized by the (AuCl4\rbrack \sp- anion. The O-H-O bond in the diadducts is among the shortest so far reported in literature. The short hydrogen bond in the (H(2-usd\rm picNO)\sb2\rbrack\lbrack AuCl\sb4\rbrackusd is unique in that the bridged proton has no symmetry restrictions usually known to exist in similar hydronium ion diadducts. The presence of a strong and broad absorption band around 1050 cm in IR spectra has been established as a diagnostic observation for the existence of a short hydrogen bond with O ... O separation less than 2.5A. (Abstract shortened by UMI.)