Influence of Mn/Ca ratio in Mn-Ca coordination clusters: synthesis, structure, and magnetic characterisation

Ako, A.M., Anson, C.E., Clérac, R., Fitzpatrick, A.J., Müller-Bunz, H., Carter, A.B., Morgan, G.G. and Powell, A.K., 2021. Influence of Mn/Ca ratio in Mn-Ca coordination clusters: synthesis, structure, and magnetic characterisation. Polyhedron, 206: 115325. ISSN 0277-5387

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Abstract

Similar reactions of MnCl2·4H2O and CaCl2 with 2,6-bis(hydroxymethyl)-4-methylphenol gave heterometallic coordination clusters with very different nuclearities, depending on the Mn:Ca ratio used. With a 1:1 ratio, the hexanuclear cluster [MnIII3CaII3(μ3-Cl(HLMe)6(H2O)6]Cl2·6.74H2O (2) with a “triangle-in-triangle” topology was obtained. However, a Mn:Ca ratio of 2:1 resulted in [MnIII12MnIICaII6(μ4-O)8(μ3-Cl)3.7(μ3-η1-N3)4.3(HLMe)12(MeCN)6]Cl2∙15MeOH (3), which corresponds structurally to the replacement by Ca2+ of six of the seven MnII centers in our previously-published cluster [MnIII12MnII7(μ4-O)8 (μ3-η1-N3)8(HLMe)12(MeCN)6]Cl2. Magnetic studies showed that the three MnIII centers in 2 are moderately antiferromagnetically coupled, while the results for 3 allowed an experimental estimate of the MnIII-MnIII coupling in the original [Mn19] cluster.

Item Type: Journal article
Publication Title: Polyhedron
Creators: Ako, A.M., Anson, C.E., Clérac, R., Fitzpatrick, A.J., Müller-Bunz, H., Carter, A.B., Morgan, G.G. and Powell, A.K.
Publisher: Elsevier
Date: 15 September 2021
Volume: 206
ISSN: 0277-5387
Identifiers:
NumberType
10.1016/j.poly.2021.115325DOI
1496066Other
Divisions: Schools > School of Science and Technology
Record created by: Jonathan Gallacher
Date Added: 08 Feb 2022 12:28
Last Modified: 08 Feb 2022 12:28
URI: http://irep.ntu.ac.uk/id/eprint/45555

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