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The Structure of a Complex Open-Framework Germanate Obtained by Combining Powder Charge-Flipping and Simulated Annealing

DOI: 10.1021/cg300647s DOI Help

Authors: A. Ken Inge (Stockholm University, Sweden) , Shiliang Huang (Stockholm University, Sweden) , Hong Chen (Stockholm University, Sweden) , Francisca Moraga (Stockholm University, Sweden) , Junliang Sun (Stockholm University, Sweden) , Xiaodong Zou (Stockholm University)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Crystal Growth & Design , VOL 12 (10)

State: Published (Approved)
Published: September 2012

Abstract: A novel open-framework germanate, denoted as SU-74-MPMD, was prepared by hydrothermal synthesis using 2-methylpentamethylenediamine (MPMD) as the organic structure directing agent (SDA). The structure of SU-74-MPMD was determined from synchrotron X-ray powder diffraction (XRPD) data using the charge-flipping algorithm, and is one of the most complicated germanates solved from X-ray powder diffraction. The structure is built of layers of Ge10O26(OH)2 (Ge10) clusters that are connected by additional GeO4 tetrahedra to form a three-dimensional (3D) framework with 10- and 12-rings. The organic structure directing agent MPMD in the pores was located by simulated annealing. SU-74-MPMD: space group P21/c, a = 12.62726(4) Å, b = 17.35186 (5) Å, c = 16.17343(5) Å, β = 115.5509(2)° and Z = 4. SU-74 was later synthesized using 1-(2-aminoethyl)piperazine (AEP) as the SDA (denoted as SU-74-AEP), and its structure was solved by single crystal synchrotron X-ray diffraction. The framework structure of SU-74-AEP is the same as that of SU-74-MPMD. The locations of the organic SDAs in the pores are different for SU-74-MPMD and SU-74-AEP, suggesting a space-filling role of the SDAs. The Ge10 clusters follow the fcu-11-P21/c net. The underlying topology of SU-74 is compared to those of other Ge10 structures containing additional GeO4 tetrahedra. The presence of additional tetrahedra can significantly affect the framework topology through the addition of edges between the Ge10 nodes.

Subject Areas: Chemistry


Instruments: I11-High Resolution Powder Diffraction , I19-Small Molecule Single Crystal Diffraction

Added On: 27/09/2012 09:23

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