Abstract: | The action of 1,10-phenanthroline (phen) on the THF solutions of RHgCl (R = 2,5-C6H3Cl2; 2,3,4? and 2,4,6-C6H2Cl3; 2,3,4,5?, 2,3,4,6?, and 2,3,5,6-C4HCl4 and C6Cl5) gives RHgCl (phen) when R contains two chlorine substituents in ortho (R = 2,4,6-C6H2Cl3; 2,3,4,6?, and 2,3,5,6-C6HCl4 and C6Cl5), but the symmetrisation reaction occurs when R = 2,5-C6H3Cl2; 2,3,4-C6H2Cl3 and 2,3,4,5-C6HCl4. The action of phen on HgR2 only gives HgR2 (phen) when R = 2,3,4,5-C6HCl4. Compounds of the type RHgMe do not react with phen. These results indicate that steric citects are as important as the electronegativity of R in the formation of tetracoordinated mercury compounds. |