Das Pentaiodid-Ion I

Untersuchungen an Polyhalogeniden, XXXXII [1].

Das Pentaiodid-Ion I

; Eine ¨ Ubersicht: Darstellung und Kristallstruktur der Verbindung [Rb(C

H

O

)](I

)

H

O

Studies on Polyhalides, XXXXII [1]. The Pentaiodide-Ion I

; an Overview:

Preparation and Crystal Structure of [Rb(C

H

O

)](I

)

H

O Ingo Pantenburg und Karl-Friedrich Tebbe (

)

Institut f¨ur Anorganische Chemie der Universit¨at zu K¨oln Greinstrasse 6, D-50939 K¨oln Sonderdruckanforderungen an Dr. Ingo Pantenburg; Fax: +49 (0)221 470 5196.

E-mail: ac118@uni-koeln.de In memoriam Prof. Dr. K.-F. Tebbe

Z. Naturforsch.56 b,271–280 (2001); eingegangen am 4. Dezember 2000 Crown Ether, Pentaiodide, Polyiodides

[Rb(benzo-18-crown-6)](I₅)H₂O could be prepared by the reaction of benzo-18-crown-6, rubidium iodide, and iodine in ethanol / dichloromethane. It crystallizes in the monoclinic space group P2₁/a with a = 1881.8(3), b = 1439.0(2), c = 2269.0(3) pm, = 111.24(1)and Z = 8. The crystal structure was refined to R_F = 0.038 for 5310 reflections. It contains two independent molecules. The two cations and the coordinating water molecules form a zigzag chain running along [1 0 0] paralleled by two structurally similar pentaiodide chains with one leg of the V-shaped pentaiodide ion forming the backbone of the chain. In both cases the other leg stands out in a novel fashion without forming a coplanar cis or trans configuration known from other pentaiodides. Anionic motifs of other crystalline pentaiodides are summarized and discussed.