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Issue 17, 2003
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Novel topologies in NiII cluster chemistry: Incorporation of alkaline-earth metals in the new [NiII6MgII2] and [NiII8MII] (M = Sr, Ba) cages

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Abstract

The reaction of the complex [Ni2(H2O)(piv)4(Hpiv)4] (1) (Hpiv = pivalic acid) with Hppo (3-phenylpyrazolin-5-one) in the presence of a base of an alkaline-earth metal (MII = MgII, SrII or BaII) has led to three different NiII clusters whose structures are controlled by the nature of MII. The formulae of the new heteronuclear cages are [Ni6Mg2(OH)2(ppo)4(piv)10(Hppo)4(MeOH)2] (2), [Ni8Sr(OH)2(ppo)6(piv)10(Hppo)5(Hpiv)2(MeCN)] (3) and [Ni8Ba(OH)2(ppo)6(piv)10(Hppo)5.3(Hpiv)0.7(MeCN)2] (4). Magnetic measurements indicate that the spin ground state of 2 consists of two independent S = 3 units, while the presence of two non-interacting S = 2 fragments in the molecule is postulated for compounds 3 and 4.

Graphical abstract: Novel topologies in NiII cluster chemistry: Incorporation of alkaline-earth metals in the new [NiII6MgII2] and [NiII8MII] (M = Sr, Ba) cages

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Article information


Submitted
29 Apr 2003
Accepted
02 Jul 2003
First published
18 Jul 2003

Dalton Trans., 2003, 3436-3442
Article type
Paper

Novel topologies in NiII cluster chemistry: Incorporation of alkaline-earth metals in the new [NiII6MgII2] and [NiII8MII] (M = Sr, Ba) cages

G. Aromí, O. Roubeau, M. Helliwell, S. J. Teat and R. E. P. Winpenny, Dalton Trans., 2003, 3436
DOI: 10.1039/B304713J

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