Coordination mode and kinetic behavior of the tetracarbonatozirconate ion

The behavior of [Zr(CO3)(3)](4=) complex in solution is studied by determin ing the coordination mode of the carbonate ligands and the kinetic law of t he equilibrium between free and complexed carbonates. Raman polarization an d dynamic C-13-NMR experiments show that complexed carbonates are bidentate . Magnetization-transfer experiments give the values of pseudo-first-order rate constants for the equilibrium with no net chemical transformation. The treatment of these parameters suggests a second-order rate law. As no solv ent effect is noticed, an associative mechanism of ligand exchange is propo sed.