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  CsCoO2 Featuring a Novel Polyoxocobaltate(III) Anion Based on a Two-Dimensional Architecture of Interconnected Tetrahedra

Ali, N. Z., Nuss, J., Kremer, R. K., & Jansen, M. (2012). CsCoO2 Featuring a Novel Polyoxocobaltate(III) Anion Based on a Two-Dimensional Architecture of Interconnected Tetrahedra. Inorganic Chemistry, 51(22), 12336-12342.

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 Creators:
Ali, N. Z.1, Author           
Nuss, J.1, 2, Author           
Kremer, R. K.3, Author           
Jansen, M.1, Author           
Affiliations:
1Abteilung Jansen, Former Departments, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370503              
2Department Quantum Materials (Hidenori Takagi), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370487              
3Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370501              

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 Abstract: CsCoO2 has been prepared along the azide/nitrate route as a reddish black microcrystalline powder at 833 K According to single crystal X-ray analysis, the title compound crystallizes as a structure type novel for oxides (Cmca, Z = 8, a = 5.9841(1) angstrom, b = 12.2458(2) angstrom, c = 8.2650(1) angstrom). The prominent features of the structure are pairs of edge linked CoO4 tetrahedra to form Co2O6 dimers, which are condensed by vertex sharing of the four remaining unshared oxygen atoms to form a two-dimensional architecture of a puckered polyoxyanion spreading along (010). Upon cooling, CsCoO2 undergoes a virtually second order phase transition at similar to 100 K leading to a systematic dovetail twin (C2/c). The magnetic susceptibilities show the dominance of antiferromagnetic interactions with a remarkably high Neel temperature of 430 K indicating a very strong antiferromagnetic superexchange between the Co3+ ions. The spin-exchange for CsCoO2 can be addressed as a set of strongly antiferromagnetically coupled quasi-one-dimensional chains, which are weakly coupled to neighboring chains by ferromagnetic interaction.

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Language(s): eng - English
 Dates: 2012
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: -
 Identifiers: eDoc: 632911
ISI: 000311173700030
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Title: Inorganic Chemistry
Source Genre: Journal
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Pages: - Volume / Issue: 51 (22) Sequence Number: - Start / End Page: 12336 - 12342 Identifier: ISSN: 0020-1669