Issue 17, 2011
From the journal:

Dalton Transactions

High-spin Ni(ii) clusters: triangles and planar tetranuclear complexes†

Athanassios D. Katsenis,a   Vadim G. Kesslerb  and  Giannis S. Papaefstathiou*a  

* Corresponding authors

a Laboratory of Inorganic Chemistry, Department of Chemistry, National and Kapodistrian University of Athens, Panepistimiopolis, Zografou, Greece
E-mail: gspapaef@chem.uoa.gr
Fax: +30 210-727-4782
Tel: +30 210-727-4840

b Department of Chemistry, Swedish University of Agricultural Sciences, Box 7015, Uppsala, Sweden

Abstract

The exploration of the NiX2/py2CO/Et3N (X = F, Cl, Br, I; py2CO = di-2-pyridyl ketone; Et3N = triethylamine) reaction system led to the tetranuclear [Ni4Cl2{py2C(OH)O}2{py2C(OMe)O}2(MeOH)2]Cl2·2Et2O (1·2Et2O) and [Ni4Br2{py2C(OH)O}2{py2C(OMe)O}2(MeOH)2]Br2·2Et2O (2·2Et2O) and the trinuclear [Ni3{py2C(OMe)O}4]I2·2.5MeOH (3·2.6MeOH), [Ni3{py2C(OMe)O}4](NO3)0.65I1.35·2MeOH (4·2MeOH) and [Ni3{py2C(OMe)O}4](SiF6)0.8F0.4·3.5MeOH (5·3.5MeOH) aggregates. The presence of the intermediate size Cl− and Br− anions resulted in planar tetranuclear complexes with a dense hexagonal packing of cations and donor atoms (tetramolybdate topology) where the X− anions participate in the core acting as bridging ligands. The F− and I− anions do not favour the above arrangement resulting in triangular complexes with an isosceles topology. The magnetic properties of 1–3 have been studied by variable-temperature dc, variable-temperature and variable-field ac magnetic susceptibility techniques and magnetization measurements. All complexes are high-spin with ground states S = 4 for 1 and 2 and S = 3 for 3.

Graphical abstract: High-spin Ni(ii) clusters: triangles and planar tetranuclear complexes

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Article information

DOI
https://doi.org/10.1039/C0DT01705A
Article type
Paper
Submitted
05 Dec 2010
Accepted
23 Feb 2011
First published
22 Mar 2011

Dalton Trans., 2011,40, 4590-4598

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High-spin Ni(II) clusters: triangles and planar tetranuclear complexes

A. D. Katsenis, V. G. Kessler and G. S. Papaefstathiou, Dalton Trans., 2011, 40, 4590 DOI: 10.1039/C0DT01705A

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