Direct Estimation of the Surface Location of Immobilized Functional Groups for Concerted Catalysis Using a Probe Molecule.
The location of active sites during concerted catalysis by a metal complex and tertiary amine on a SiO2 surface is discussed based on the interaction between the functionalized SiO2 surface and a probe molecule, p-formyl phenylboronic acid. The interactions of the probe molecule with the surface functionalities, diamine ligand, and tertiary amine, were analyzed by FT-IR and solid-state (13)C and (11)B MAS NMR. For the catalyst exhibiting high 1,4-addition activity, the diamine ligand and tertiary amine base exist in closer proximity than in the catalyst with low activity.
['Noda|Hiroto|H|', 'Motokura|Ken|K|', 'Wakabayashi|Yusuke|Y|', 'Sasaki|Kaori|K|', 'Tajiri|Hiroo|H|', 'Miyaji|Akimitsu|A|', 'Yamaguchi|Sho|S|', 'Baba|Toshihide|T|']
probe molecule amine active site distance heterogeneous concerted catalysis