 |
 |
Fig. 1: Coordination polyhedron |
Fig. 2: Cell projection along [010] |
STRUCTURE OF INCOMMENSURATELY MODULATED Rb[Cr(eida)2]
Gernot Zahn1, Martin Boddin2, Roland Meier2
1 Institut für Kristallographie
und Festkörperphysik, Technische Universität Dresden, D
01062 Dresden, Germany, email: zahn@physik.tu-dresden.de
2 Institut für Anorganische Chemie,
Universität Leipzig, Talstr. 33, D 04103 Leipzig, Germany
Keywords: crystal structure, coordination compound,
incommensurate modulation
The X-ray single-crystal structure analysis of the rubidium salt of trans-bis-N-ethyliminodiacetato chromium(III) (1) has shown that 1 crystallizes incommensurately modulated with the superspace group C 2/c (0b0) (a = 16.994(2), b = 7.4364(9), c = 13.447(2) A, b = 111.534(9)°, q = 0.362(1)b*). The complex ion in 1 is centrosymmetric and the CrIII center has CN 6.
In the related structure of Rb[Cr(mida)2] (2,
mida = N-methyliminodiacetate), the complex ions differ from
those in the title compound by a closer packing and a lower
flexibility of the ligand. As a consequence, 2
crystallizes in the conventional space group C 2/c
without modulation.
|
|
Fig. 1: Coordination polyhedron |
Fig. 2: Cell projection along [010] |