Open AccessPhosphonate‐Type Pseudo‐Grafted Precursor: Efficient Surface Modification of Silica
Author(s) -
Ishizaka Yusuke,
Matsumoto Kazuhiro,
Sato Kazuhiko,
Choi JunChul
Publication year - 2022
Publication title -
chemistry ‐ methods
Language(s) - English
Resource type - Journals
ISSN - 2628-9725
DOI - 10.1002/cmtd.202100080
Subject(s) - moiety , phosphonate , grafting , surface modification , silicon , phosphorus , metal , polymer chemistry , materials science , chemical engineering , chemistry , inorganic chemistry , organic chemistry , engineering , polymer
Surface modification of inorganic metal oxides by grafting phosphonate compounds is a highly useful method for acquiring organic–inorganic hybrid materials. Compared to metal oxides, it is still difficult to modify silica by phosphonates. In this work, we developed an arylphosphonate “pseudo‐grafted precursor” ( P ‐PGP 1 ) bearing a disilicate moiety (−OSi(O t Bu) 2 OSi(O t Bu) 2 O−). While conventional grafting methods rely on Si−O−P bond formation, P ‐PGP 1 undergoes Si−O−Si bond formation through a substitution reaction on the silicon atoms of the disilicate moiety. Therefore, P ‐PGP 1 was grafted onto a silica surface at room temperature with a higher phosphorus content than that obtained with arylphosphonic acid. The characterization of surface species by 31 P and 13 C CP/MAS NMR analyses and the evaluation of the phosphorus content suggested that the grafting mode of P ‐PGP 1 allows efficient surface modification of the silica surface.