| Autor: |
McEllin AJ; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K., Goult CA; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K., Mohiuddin G; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K.; Department of Chemistry, University of Science & Technology Meghalaya, Ri-Bhoi, Meghalaya 793101, India., Curtis LJ; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K., Tanner TFN; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K., Whitwood AC; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K., Lynam JM; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K., Bruce DW; Department of Chemistry, University of York Heslington, YORK YO10 5DD, U.K. |
| Abstrakt: |
A series of isomeric bis-2,6-(monoalkoxyphenyl)pyridine and bis-2,6-(dialkoxyphenyl)pyridine ligands were synthesized and characterized. In order to prepare their chlorogold(III) complexes, intermediate chloromercury(II) complexes were first prepared, but unlike observations from previous studies where they were obtained impure and at best in moderate yield, here pure complexes were synthesized, many in rather high yields. Depending on the substitution pattern of the alkoxy chains on the ligands, mono- and/or dimercurated complexes were obtained, characterized by 1 H, 13 C{ 1 H}, and 199 Hg NMR spectroscopy as well as, in several cases, by X-ray crystallography. Factors that may explain this unusual reactivity are discussed. In most cases, transmetalation to the related chlorogold(III) complex proceeded smoothly, although lower yields were obtained when starting from doubly mercurated precursors. Prompted by the propensity of these ligands to mercurate, attempts were made to effect direct auration, but none was successful. However, dimeric, orthometalated complexes of palladium(II) could be prepared and were also amenable to transmetalation to the chlorogold(III) complex, providing for a mercury-free synthesis. |
