ON POLYIODIDES OF COMPLEX CATIONS WITH 1,2-ETHANEDIAMINE AS LIGAND
Carsten Wieczorrek, Karl-Friedrich Tebbe
Institut für Anorganische Chemie der Universität zu Köln D-50939 Köln, Greinstraße 6 tebbe@rrz.uni-koeln.de
Keywords: Polyiodides, tetraiodides(2-), triiodides(1-), 1,2-ethanediamine, ethanediamine complexes, crystal structures
Two families of polyiodides [M(en)3]I(I3) (M = Ni, Zn, Cd, Sn) and [M(en)2(I3)2] (M = Ni, Pd, Cu, Zn, Cd, Pb) with complex cations of divalent metals M2+ with ethanediamine en as ligand are known for a long time [1, 2, 3, 4]. The octahedrally coordinated cations [M(en)3]2+ of the first series are often burdened with disorder concerning their configuration. The second series of compounds may be derived from a simple hexagonal bundle of one cationic {[M(en)22+} and two anionic {2I3-} rods which is often disarranged by stacking faults. In the meantime well ordered crystals are available for members of the two families of compounds [5]. Some crystal structures will be presented, explained und compared.
| compound | RG | Z | a | b | c | V | R1 | wR2 |
|---|---|---|---|---|---|---|---|---|
| [Ni(en)3]I(I3) | I4-2d | 4 | 14.670(1) | 17.754(2) | 3820.8(6) | 0.024 | 0.039 | |
| [Zn(en)3]I(I3) | I4-2d | 4 | 14.742(1) | 17.791(1) | 3866.5(3) | 0.018 | 0.036 | |
| [Sn(en)3]I(I3) | I4-2d | 4 | 14.765(1) | 17.823(2) | 3885.5(6) | 0.066 | 0117 | |
| [Cu(en)2(I.I2)2] | Ibam | 4 | 7.497(1) | 13.400(1) | 18.586(2) | 1867.1(3) | 0.033 | 0.067 |
This work is a resumption of earlier investigations. It was supported by the Fonds der Chemischen Industrie. We want to thank Prof. Dr. Gerd Meyer for making an IPDS diffractometer available and Dr. Theo Gilles for his assistance in structural work.