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NiII36-Containing 54-Tungsto-6-Silicate: Synthesis,Structure, Magnetic and Electrochemical Studies |
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| Authors: | Dr Joydeb Goura Dr Bassem S Bassil Xiang Ma Ananthu Rajan Dr Eufemio Moreno-Pineda Prof Jürgen Schnack Dr Masooma Ibrahim Prof Annie K Powell Prof Mario Ruben Jingjing Wang Prof Laurent Ruhlmann Prof Ulrich Kortz |
| Institution: | 1. Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany;2. Department of Life Sciences and Chemistry, Jacobs University, Campus Ring 1, 28759 Bremen, Germany
Department of Chemistry, Faculty of Arts and Sciences, University of Balamand, Tripoli, Lebanon;3. Departamento de Química-Física, Escuela de Química, Facultad de Ciencias Naturales, Exactas y Tecnología, Universidad de Panamá, Panamá Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany;4. Faculty of Physics, Bielefeld University, P.O. Box 100131, 33501 Bielefeld, Germany;5. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany;6. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstrasse 15, 76131 Karlsruhe, Germany;7. Institute of Nanotechnology, Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz?1, 76344 Eggenstein-Leopoldshafen, Germany Centre Européen de Sciences Quantiques (CESQ), Institut de Science et d'Ingénierie Supramoléculaire (ISIS), 8, Allée Gaspard Monge, 67000 Strasbourg, France;8. Laboratoire d'Electrochimie et de Chimie Physique du Corps Solide, Université de Strasbourg, Institut de Chimie UMR CNRS 7177, 4 rue Blaise Pascal, CS 90032, 67081 Strasbourg cedex, France |
| Abstract: | The 36-NiII-containing 54-tungsto-6-silicate, Ni36(OH)18(H2O)36(SiW9O34)6]6? ( Ni36 ) was synthesized by a simple one-pot reaction of the Ni2-pivalate complex Ni2(μ-OH2)(O2CCMe3)4(HO2CCMe3)4] with the trilacunary SiW9O34]10? polyanion precursor in water and structurally characterized by a multitude of physicochemical techniques including single-crystal XRD, FTIR, TGA, elemental analysis, magnetic and electrochemical studies. Polyanion Ni36 comprises six equivalent {NiII6SiW9} units which are linked by Ni?O?W bridges forming a macrocyclic assembly. Magnetic studies demonstrate that the {Ni6} building blocks in Ni36 remain magnetically intact while forming a hexagonal ring with antiferromagnetic exchange interactions between adjacent {Ni6} units. Electrochemical studies indicate that the first reduction is reversible and associated with the WVI/V couple, whereas the second reduction is irreversible attributed to the NiII/0 couple. |
| Keywords: | Electrochemistry magnetic properties nickel polyoxometalates structure elucidation |