Carboxylic Acid-Doped SBA-15 Silica as a Host for Metallo-supramolecular Coordination Polymers

被引：43

作者：

Akcakayiran, D. ^{[1
]}

Mauder, D. ^{[2
]}

Hess, C. ^{[3
]}

Sievers, T. K. ^{[4
]}

Kurth, D. G. ^{[4
]}

Shenderovich, I. ^{[2
]}

Limbach, H. -H. ^{[2
]}

Findenegg, G. H. ^{[1
]}

机构：

[1] Tech Univ Berlin, Inst Chem, D-10623 Berlin, Germany

[2] Free Univ Berlin, Inst Chem & Biochem, D-14195 Berlin, Germany

[3] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

[4] Max Planck Inst Colloids & Interfaces, D-14424 Potsdam, Germany

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2008年 / 112卷 / 46期

关键词：

D O I：

10.1021/jp804712w

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption of a metallo-supramolecular coordination polymer (Fe-MEPE) in the cylindrical pores of SBA-15 silica with pure and carboxylic acid (CA) carrying pore walls has been studied. Fe-MEPE is an intrinsically stiff polycation formed by complexation of Fe(II)-acetate with an uncharged ditopic bis-terpyridine ligand. The adsorption affinity and kinetics of the Fe-MEPE chains is strongly enhanced when the pore walls are doped with CA, and when the pH of the aqueous medium or temperature is increased. The initial fast uptake is connected with a decrease of pH of the aqueous solution, indicating an ion-exchange mechanism. It is followed by a slower (presumably diffusion-controlled) further uptake. The maximum adsorbed amount of Fe-MEPE in the CA-doped material corresponds to a monolayer of Fe-MEPE chains disposed side-by-side along the pore walls. The stoichiometry of Fe-MEPE in the pores (determined by XPS) was found to be independent of the loading and similar to that of the starting material. The mean chain length of Fe-MEPE before and after embedding in the CA-doped matrix was studied by solid-state N-15 NMR using partially N-15-labeled Fe-MEPE. It is shown that the average chain length of Fe-MEPE is reduced when the complex is incorporated in the pores.

引用

页码：14637 / 14647

页数：11

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