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Synthesis and Crystal Structure of Alkali Metal and Ammonium Nitratocuprates(II): M3[Cu(NO3)4](NO3) (M = K, NH4, Rb) and Cs2[Cu(NO3)4]

✍ Scribed by I. V. Morozov; A. A. Fedorova; S. I. Troyanov

Publisher: John Wiley and Sons
Year: 1998
Tongue: German
Weight: 122 KB
Volume: 624
Category: Article
ISSN: 0372-7874
DOI: 10.1002/(sici)1521-3749(199809)624:9<1543::aid-zaac1543>3.0.co;2-5

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✦ Synopsis

Blue crystals of metal nitratocuprates(II), M 3 [Cu(NO 3 ) 4 ](NO 3 ) (M = K (I), NH 4 (II), Rb (III)) and Cs 2 [Cu(NO 3 ) 4 ] (IV) were synthesized from Cu(NO 3 ) 2 3 H 2 O and MNO 3 by heating at 100±140 °C during 3±12 h. X-ray single crystal structures for isotypic I and II reveal the presence of the [Cu(NO 3 ) 4 ] 2± and NO 3 ± anions and M + cations. Structure IV contains [Cu(NO 3 ) 4 ] 2± and Cs + . In structures I, II, and IV, Cu atoms have a square-planar coordination [CuO 4 ] with short Cu±O distances of 1.92±2.00 A Ê , the oxygen atoms belonging to four different NO 3 groups. Each coordinated NO 3 group is a nonsymmetrical bidentate ligand with the second, longer Cu±O distance from 2.38 to 2.74 A Ê . Rubidium derivative III was shown to be isotypic to I on the basis of unit cell dimensions and symmetry. Eightcoordinate metal(II) environment in tetranitrates is compared for transition metals with different electronic configurations.

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