Die Kristallstrukturen von 1,4-Dimethylpiperazinium-tetrabromocobaltat(II) und -zinkat(II), (dmpipzH₂) [M^IIBr₄] (M = Co, Zn) / The Crystal Structures of 1,4-Dimethylpiperazinium Tetrabromocobaltate(II) and -Zincate(II), (dmpipzH₂) [M^IIBr₄] (M = Co, Zn)

Open Access

1 January 1996

journal article
Published by Walter de Gruyter GmbH in Zeitschrift für Naturforschung B

Vol. 51 (1) , 9-13
https://doi.org/10.1515/znb-1996-0103

Abstract

The compounds (dmpipzH₂)[M^IIBr₄] (M = Co, Zn) crystallize at room temperature from equimolar solutions of 1,4-dimethylpiperazine and MBr₂ · n H₂O in 3M HBr. (dmpipzH₂)[CoBr₄] is isotypic with the homologous chlorometalates of Co and Zn and crystallizes in the mono clinic space group P2₁/m with a = 6.424(3), b = 14.588(6), c = 7.102(6) Å, β = 90.87(6)°, Z = 2. (dmpipzH₂)[ZnBr₄], however, crystallizes in the monoclinic space group P2₁/c with a = 7,605(5), b = 13,760(9), c = 13,286(7) Å, β = 93,03(6)°, Z = 4. Both structures contain centrosymmetric cations (dmpipzH₂)²⁺ in the chair form and slightly distorted tetrahedra [MBr₄]^2- with a mirror plane in the case of M = Co. Several distances N···Br in both structures are interpreted in terms of N-H···Br hydrogen bonds which are favoured by the packing in the case of M = Zn.

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Die Kristallstrukturen von 1,4-Dimethylpiperazinium-tetrabromocobaltat(II) und -zinkat(II), (dmpipzH2) [MIIBr4] (M = Co, Zn) / The Crystal Structures of 1,4-Dimethylpiperazinium Tetrabromocobaltate(II) and -Zincate(II), (dmpipzH2) [MIIBr4] (M = Co, Zn)

Abstract

Keywords

Die Kristallstrukturen von 1,4-Dimethylpiperazinium-tetrabromocobaltat(II) und -zinkat(II), (dmpipzH₂) [M^IIBr₄] (M = Co, Zn) / The Crystal Structures of 1,4-Dimethylpiperazinium Tetrabromocobaltate(II) and -Zincate(II), (dmpipzH₂) [M^IIBr₄] (M = Co, Zn)