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Site‐Selective Functionalization of Periodic Mesoporous Organosilica (PMO) with Macrocyclic Host for Specific and Reversible Recognition of Heavy Metal
Author(s) -
Ye Gang,
Leng Yuxiao,
Bai Feifei,
Wei Jichao,
Wang Jianchen,
Chen Jing
Publication year - 2013
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.201300131
Subject(s) - surface modification , mesoporous organosilica , mesoporous material , x ray photoelectron spectroscopy , materials science , desorption , supramolecular chemistry , adsorption , metal , molecule , combinatorial chemistry , inorganic chemistry , chemical engineering , mesoporous silica , chemistry , organic chemistry , catalysis , engineering , metallurgy
A novel kind of macrocyclic‐host‐functionalized periodic mesoporous organosilica (PMO) with excellent and reversible recognition of Pb II was developed. The macrocyclic host molecule cis ‐dicyclohexano[18]crown‐6, with strong affinity to Pb II , was carefully modified as a bridged precursor to build the PMO material. To break down the limit of the functionalization degree for PMOs incorporated with large‐sized moieties, a site‐selective post‐functionalization method was proposed to further decorate the external surface of the PMO material. The selective recognition ability of the upgraded PMO material towards Pb II was remarkably enhanced without destroying the mesoporous ordering. Solid‐state 13 C and 29 Si NMR spectroscopy, X‐ray photoelectron spectroscopy (XPS), XRD, TEM, and nitrogen adsorption–desorption isotherm measurements were utilized for a full characterization of the structure, micromorphology, and surface properties. Reversible binding of Pb II was realized in the binding–elution cycle experiments. The mechanism of the supramolecular interaction between the macrocyclic host and metal ion was discussed. The synthetic strategy can be considered a general way to optimize the properties of PMOs as binding materials for practical use while preserving the mesostructure.