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Zu Strängen assoziierte Ionen [AsCl

4

· AsCl

3

]

Ð

im

[Mg(NCCH

3

)

6

][As

4

Cl

14

]

Strands of Associated [AsCl

4

· AsCl

3

]

Ð

Ions in [Mg(NCCH

3

)

6

][As

4

Cl

14

] Susanne Rabe und Ulrich Müller*

Fachbereich Biologie/Chemie, Universität Gh Kassel

* Neue Anschrift: Prof. U. Müller, Fachbereich Chemie, Universität, D-35032 Marburg.

Fax +49 (0)6 42 12 82 56 53

Z. Naturforsch.55b, 553Ð555 (2000);

eingegangen am 9. März 2000 Heptachlorodiarsenate(III)

The reaction of arsenic, MgSO4and S2Cl2in ace- tonitrile yielded the title compound along with 4,5- dichloro-1,2,3-dithiazolium chloride, [C2NS2Cl2]Cl (which was formed from the solvent and S2Cl2).

The crystal strucutre of [Mg(NCCH3)6][As4Cl14] was determined by X-ray diffraction. It is triclinic, space groupP1¯,Z= 2,R= 0.049. The Mg2+ion is coordinated by six acetonitrile ligands. The anions consist of AsCl4Ðand AsCl3units which are asso- ciated to chains along theaaxis by As ··· Cl con- tacts. Each As atom has distorted octahedral coor- dination.

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