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A Nonanuclear NiII Cluster with a 1,2,4-Triazolo[4,3-a]pyrimidine Derivative

✍ Scribed by Sawsan Salameh; Mohammad Abul-Haj; Miguel Quirós; Juan M. Salas

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
87 KB
Volume
2005
Category
Article
ISSN
1434-1948

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✦ Synopsis

Abstract

This article describes the nickel cluster compound Ni~9~L~8~(OH)~6~(NH~3~)~4~(H~2~O)~8~~4~·8H~2~O, where L represents the anionic form of the ligand 7,8‐dihydro‐1,2,4‐triazolo[4,3‐a]pyrimidin‐7‐one. The structure of the cation of this compound is rather complicated, involving nine metal atoms, eight bridging organic ligands, bridging hydroxyl groups, and terminal ammonia and water molecules. The central nickel atom lies on a crystallographic inversion centre, while the other eight define two disorted “cubane‐like” [Ni~4~(OH)~3~]^5+^ subclusters. Each subcluster is linked to the central atom by three triple bridging organic ligands. Additional L ligands bridge two external metal atoms in each subcluster. The variation with temperature of the magnetic susceptibility of the compound indicates the presence of both ferromagnetic and antiferromagnetic interactions; the latter is predominant. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)

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