The importance of ligand-induced backdonation in the stabilization of square planar d10 nickel π-complexes

A series of Ni π-complexes are explored using a combination of spectroscopic and computational methods to reveal an intriguing contribution to backbonding: metal-mediated ligand-to-ligand backdonation. Such <i>ligand-induced backdonation</i> is the dominant contribution for weakly π-acidic ligands such alkenes and allows for strong bonding even though the metal centre retains a formal d¹⁰ electronic configuration.

The importance of ligand-induced backdonation in the stabilization of square planar d10 nickel π-complexes

A series of Ni π-complexes are explored using a combination of spectroscopic and computational methods to reveal an intriguing contribution to backbonding: metal-mediated ligand-to-ligand backdonation. Such <i>ligand-induced backdonation</i> is the dominant contribution for weakly π-acidic ligands such alkenes and allows for strong bonding even though the metal centre retains a formal d¹⁰ electronic configuration.

Catalytic Synthesis of Adipic Acid with H4SiW6Mo6O40/SiO2

Using aqueous hydrogen peroxide solution (30wt%) as oxidant, potassium bisulfate (KHSO4) as acid ligand, adipic acid was synthesized with cyclohexanone as raw material and H4SiW6Mo6O40/SiO2 as catalyst. The factors influencing the synthesis were discussed and the best reaction conditions were found out. Experimental results showed that H4SiW6Mo6O40/SiO2 is an excellent catalyst. The optimal conditions are: n (cyclohexanone):n (H2O2)=1:4.0,catalyst dosage is 0.4g, mass of acidic ligands is 0.1g, and the reaction time is 4 h, the yield of adipic acid can reach 93.7 %.