Two new organic-inorganic hybrid compounds based on metal-pyrazine coordination polymers and Keggin polyoxometalates: effect of metal ions on the structure

Journal Article · Wed Dec 15 04:00:00 UTC 2010 · Journal of Solid State Chemistry

OSTI ID:21494148

Fengyun, Cui; Xiaoyu, Ma; Cong, Li; Tao, Dong; Yuanzhe, Gao; Zhangang, Han; Yingnan, Chi ^[1]

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1. Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Institute of Technology, Beijing 100081 (China)

Through changing the metal ions, two Keggin polyoxometalates-based hybrid compounds, [Cu{sub 5}(pz){sub 6}(Cl)(SiW{sub 12}O{sub 40})] (1) and [Ag{sub 4}(pz){sub 3}(H{sub 2}O){sub 2}(SiW{sub 12}O{sub 40})] (2) (pz=pyrazine), were hydrothermally synthesized and characterized by an elemental analysis, IR spectroscopy, thermogravimetric analyses, and single X-ray diffraction. In compound 1, the metal-organic motif exhibits a 6{sup 3} topological 2-D sheet, which is further fused by the [SiW{sub 12}O{sub 40}]{sup 4-} anions to construct a (6.7.8)(6{sup 3}.7.8{sup 2})(6{sup 3})(6{sup 5}.7)(6{sup 5}.8) topological 3D structure. In compound 2, the bridging groups Ag{sub 2}(pz) connect the [SiW{sub 12}O{sub 40}]{sup 4-} anions to form a (5{sup 3}){sub 2}(5{sup 4}.8{sup 2}) topological 2-D layer, which is further linked by an [Ag(pz)]{sub n}{sup n+} chains to construct a 3D structure with the (3{sup 4}.4{sup 16}.5{sup 24}.6{sup 12}.7{sup 8}.8{sup 2})(3{sup 4}.4{sup 6}.5{sup 4}.6){sub 2}(4.5{sup 2}){sub 2} topology. It represents the highest connected network topology presently known for the polyoxometalates system. The structure differences of compounds 1 and 2 reveal that the coordination numbers and geometries of the metal ions have a great influence on the final structure and topology of the Keggin POMs-based hybrid compounds. In addition, the electrochemistry properties of the two compounds have been studied. -- Graphical Abstract: Two new highly connected Keggin POMs-based hybrids have been synthesized by changing metal ions under hydrothermal conditions and the effect of metal ions on the final structure and topology of the POMs-based hybrid compounds was discussed. Display Omitted

• OSTI ID: 21494148
• Journal Information: Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 12 Vol. 183; ISSN 0022-4596; ISSN JSSCBI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ANIONS
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMISTRY
COHERENT SCATTERING
COMPLEXES
COPPER COMPLEXES
CRYSTAL STRUCTURE
DIFFRACTION
ELECTROCHEMISTRY
GRAVIMETRIC ANALYSIS
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
IONS
MATHEMATICS
ORGANIC COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYMERS
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
SCATTERING
SILICON COMPOUNDS
SILVER COMPLEXES
SPECTRA
SYNTHESIS
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TOPOLOGY
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION