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Synthesis and Crystal Structure of Cesium Nitratometalates(II), Cs2[M(NO3)4] (M = Mn, Co, Ni, Zn)

✍ Scribed by I. V. Morozov; E. Kemnitz; S. I. Troyanov

Publisher
John Wiley and Sons
Year
1999
Tongue
German
Weight
114 KB
Volume
625
Category
Article
ISSN
0372-7874

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✦ Synopsis

Crystalline cesium

nitratometalates(II), Cs 2 [M(NO 3 ) 4 ] (M = Mn (I), Co (II), Ni (III), and Zn (IV)) were synthesized from M(NO 3 ) 2 ´n H 2 O and CsNO 3 by heating at 80±120 °C over 10±12 h. According to X-ray crystal structure analysis, the compounds are built from Cs + cations and [M(NO 3 ) 4 ] 2± anions. The latter differ by the type of metal coordination: a dodecahedron for Mn in I (CN = 8, r Mn±O 2.24±2.37 A Ê ), a seven coordination for Co in II (CN = 4 + 3, r Co±O 2.03±2.16 A Ê and 2.21±2.35 A Ê ) and a tetra-hedral distorted dodecahedron for Zn in IV (CN = 4 + 4, r Zn±O 1.98±2.15 A Ê and 2.38±2.72 A Ê ). Ni atom in III has a distorted octahedral NiO 6 environment provided by two unidentate and two bidentate NO 3 groups with Ni±O distances of 2.01±2.14 A Ê . The differences in metal coordination are discussed in terms of valence electron configurations, ionic radii, and the packing effects.

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