Syntheses, crystal structures, and properties of three new metal selenites Na{sub 2}Co{sub 2}(SeO{sub 3}){sub 3}, Na{sub 2}Co{sub 1.67}Ni{sub 0.33}(SeO{sub 3}){sub 3}, and Na{sub 2}Ni{sub 2}(SeO{sub 3}){sub 3}

• Published in: Journal of solid state chemistry Vol. 183; no. 9
• Main Authors: Yuan Xiaoqing, Graduate School of the Chinese Academy of Sciences, Beijing 100049, Feng Meiling, Li Jianrong, Huang Xiaoying
• Format: Journal Article
• Language: English
• Published: United States 15.09.2010
• Subjects: ACETONITRILE; ALKALI METAL COMPOUNDS; ANTIFERROMAGNETISM; CALORIMETRY; CHARGED PARTICLES; CHEMICAL ANALYSIS; COBALT COMPOUNDS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CRYSTALS; DIFFRACTION; DISPERSIONS; GRAVIMETRIC ANALYSIS; HYDROGEN COMPOUNDS; IONS; MAGNETIC PROPERTIES; MAGNETISM; MATERIALS SCIENCE; MIXED SOLVENTS; MIXTURES; MONOCRYSTALS; NICKEL COMPOUNDS; NITRILES; ORGANIC COMPOUNDS; ORGANIC NITROGEN COMPOUNDS; ORTHORHOMBIC LATTICES; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; QUANTITATIVE CHEMICAL ANALYSIS; SCATTERING; SELENITES; SELENIUM COMPOUNDS; SODIUM COMPOUNDS; SODIUM IONS; SOLVENTS; SPACE GROUPS; SYMMETRY GROUPS; SYNTHESIS; THERMAL ANALYSIS; THERMAL GRAVIMETRIC ANALYSIS; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS; WATER; X-RAY DIFFRACTION
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2010.06.020

Three new sodium cobalt (nickel) selenite compounds, namely, Na{sub 2}Co{sub 2}(SeO{sub 3}){sub 3}, Na{sub 2}Co{sub 1.67}Ni{sub 0.33}(SeO{sub 3}){sub 3}, and Na{sub 2}Ni{sub 2}(SeO{sub 3}){sub 3} have been hydro-/solvothermally synthesized in the mixed solvents of acetonitrile and water. Single-crystal X-ray diffraction analyses reveal that these isostructural compounds belong to the orthorhombic Cmcm space group and their structures feature three-dimensional open frameworks constructed by the two-dimensional layers of [MSeO{sub 3}] pillared by the [SeO{sub 3}]{sup 2-} groups. The two different types of Na{sup +} ions reside in the intersecting two-dimensional channels parallel to the a- and c-axes, respectively. Their thermal properties have been investigated via TGA-DSC. The magnetic measurements indicate the existence of the antiferromagnetic interactions in these compounds. - Graphical abstract: Three new isostructural metal selenites, Na{sub 2}Co{sub 2}(SeO{sub 3}){sub 3}, Na{sub 2}Co{sub 1.67}Ni{sub 0.33}(SeO{sub 3}){sub 3}, and Na{sub 2}Ni{sub 2}(SeO{sub 3}){sub 3} have been hydro-/solvothermally synthesized and characterized. Their structures feature three-dimensional open frameworks with Na{sup +}-occupied channels.