Two new organic-inorganic hybrid compounds based on metal-pyrazine coordination polymers and Keggin polyoxometalates: effect of metal ions on the structure
- 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, Vol. 183, Issue 12; Other Information: DOI: 10.1016/j.jssc.2010.09.034; PII: S0022-4596(10)00433-0; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0022-4596
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ANIONS
COPPER COMPLEXES
CRYSTAL STRUCTURE
ELECTROCHEMISTRY
HYDROTHERMAL SYNTHESIS
INFRARED SPECTRA
ORGANOMETALLIC COMPOUNDS
OXIDES
POLYMERS
SILICON COMPOUNDS
SILVER COMPLEXES
THERMAL GRAVIMETRIC ANALYSIS
TOPOLOGY
TUNGSTEN COMPOUNDS
X-RAY DIFFRACTION
CHALCOGENIDES
CHARGED PARTICLES
CHEMICAL ANALYSIS
CHEMISTRY
COHERENT SCATTERING
COMPLEXES
DIFFRACTION
GRAVIMETRIC ANALYSIS
IONS
MATHEMATICS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REFRACTORY METAL COMPOUNDS
SCATTERING
SPECTRA
SYNTHESIS
THERMAL ANALYSIS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS