Synthesis and Crystal Structure of the Solid Solution Co-3(SeO3)(3-x)(PO3OH)(x)(H2O) Involving Crystallographic Split Positions of Se4+ and P5+
2013 (English)In: Inorganic Chemistry, ISSN 0020-1669, E-ISSN 1520-510X, Vol. 52, no 20, 11792-11797 p.Article in journal (Refereed) Published
Three new cobalt selenite hydroxo-phosphates laying in the solid solution Co-3(SeO3)(3-x)(PO3OH)(x)(H2O), with x = 0.8, x = 1.0, and x = 1.2 are reported. Single crystals were obtained by hydrothermal synthesis and the crystal structure was determined by single crystal X-ray diffraction. The structure can be described as a 3D framework having selenite and hydroxo-phosphate groups protruding into channels in the crystal structure. Se4+ and P5+ share a split position in the structure so that either SeO3 groups having a stereochemically active lone pair or tetrahedrally coordinated PO3OH groups are present. The OH-group is thus only present when the split position is occupied by P5+. The crystal water is coordinated to a cobalt atom and TG and IR measurements show that the water and hydroxyl groups leave the structure at unusually high temperatures (>450 degrees C). Magnetic susceptibility measurements show antiferromagnetic coupling below 16 K and a magnetic moment of 4.02(3) mu(B) per Co atom was observed.
Place, publisher, year, edition, pages
2013. Vol. 52, no 20, 11792-11797 p.
Research subject Inorganic Chemistry
IdentifiersURN: urn:nbn:se:su:diva-96601DOI: 10.1021/ic401111zISI: 000326065600016OAI: oai:DiVA.org:su-96601DiVA: diva2:666972