Surface Chemistry. The reactivity towards oxide surfaces was investigated by contacting a benzene solution of complex 1-Ni with SiO2-700 (SiO2 partially dehydroxylated at 700 °C, OH density ca. 1 OH/nm 2 , 1-Ni:OH ca. 9:10). Within ca. 1 hour, the solution was colorless, whereas the silica material turned orange. Analysis of the grafting solution by 1 H-NMR showed no residual complex remaining in solution and no (protonated) ligand was released in the solution phase upon immobilization.