Self-assembly of a metallosupramolecular coordination polyelectrolyte in the 
pores of SBA-15 and MCM-41 silica

Akcakayiran, Dilek; Kurth, Dirk G.; Röhrs, Stefan; Rupprechter, Günther; Findenegg, Gerhard H.

doi:10.1021/la050230x

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Self-assembly of a metallosupramolecular coordination polyelectrolyte in the pores of SBA-15 and MCM-41 silica

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Kurth, Dirk G.
Max Planck Society;

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Rupprechter, Günther
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Citation

Akcakayiran, D., Kurth, D. G., Röhrs, S., Rupprechter, G., & Findenegg, G. H. (2005). Self-assembly of a metallosupramolecular coordination polyelectrolyte in the pores of SBA-15 and MCM-41 silica. Langmuir, 21(16), 7501-7506. doi:10.1021/la050230x.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0011-07F3-7

Abstract

It is shown that intrinsically stiff chain aggregates of a metallosupramolecular coordination polyelectrolyte (MEPE) can form in the cylindrical nanopores of MCM-41 and SBA-15 silica by self-assembly of its constituents (metal ions and organic ligand). The UV/vis spectra of the resulting MEPE-silica composites exhibit the characteristic metal-to-ligand charge transfer band of the MEPE complex in solution. For the MEPE-silica composite in SBA-15 an iron content of 1.2 wt % was found, corresponding to ca. 10 MEPE chains disposed side by side in the 8 nm wide pores of the SBA-15 matrix. In the case of MCM-41 (pore width < 3 nm), where only one MEPE chain per pore can be accommodated, an iron content of 0.3 wt % was obtained, corresponding to half-filling of the pores. It was also found that MEPE chains spontaneously enter the pores of SBA-15, when a solution of MEPE is exposed to the silica matrix.