General cooperative effects of single atom ligands on a metal: a Pt-195 NMR chemical shift as a function of coordinated halido ligands' ionic radii overall sum

摘要

An inverse linear relationship between the experimentally observed Pt-195 NMR signals and the overall sum of coordinated halido ligands' ionic radii was discovered in Pt(II) and Pt(IV) complexes. The reduction of Pt-195 NMR frequencies parallels the increase of coordinated halido ligands' ionic radii sum. This suggests that each halido ligand may act as a conducting ring whose induced electric current shields the Pt-195 NMR signals proportionally to the ionic radius of the coordinated halido ligand.