CH3-groups of the iso-propyl and bound to the quaternary carbon are observed at 23 ppm and 12 ppm, respectively. On Al2O3-600,(g-Al2O3 partially dehydroxylated at 600 °C) 1-Ni also immobilized without loss of ligand, and the changes in the IR spectrum (Figure ) are consistent with deprotonation of OH groups by the amidinate ligand, as evidenced by the diminished intensity of OH groups, in particular bound to 5-and 6-fold coordinate Al sites on the surface (3776 cm -1 and 3731 cm -1 , respectively). In addition to C-H stretching bands around 3000 cm -1 , a C=N stretching band (ca. 1600 cm -1 ) and N-H stretching bands 3400-3200 cm -1 ) emerged, indicating that grafting occurs via a similar pathway as discussed for SiO2-700. This is further supported by C-MAS SSNMR spectroscopy of 1-Ni/Al2O3-600 (Figure ).