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 fun...

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Bibliographic Details
Published in:Chemistry : a European journal 2016-04, Vol.22 (15), p.5113-5117
Main Authors: Noda, Hiroto, Motokura, Ken, Wakabayashi, Yusuke, Sasaki, Kaori, Tajiri, Hiroo, Miyaji, Akimitsu, Yamaguchi, Sho, Baba, Toshihide
Format: Article
Language:English
Subjects:
active site distance
amine
Amines
Catalysis
Catalysts
Catalytic activity
Chemistry
Coordination compounds
Diamines
Functional anatomy
Functional groups
heterogeneous concerted catalysis
Ligands
Metals
NMR
Nuclear magnetic resonance
probe molecule
Proximity
Silicon dioxide
Surface chemistry
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Summary: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 13C and 11B 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. Probing the surface: A novel technique using a probe molecule enables the measurement of active site distance for surface concerted catalysis; the relationship between catalytic activity and the immobilized metal complex–organic base distance on the SiO2 surface was clarified.
ISSN:0947-6539
1521-3765
DOI:10.1002/chem.201600263