title: Copper Lanthanide Phosphonate Cages: Highly Symmetric {Cu3Ln9P6} and {Cu6Ln6P6} Clusters with C3v and D3h Symmetry.
abstract: Two families of copper lanthanide phosphonate clusters have been obtained through reaction of [Cu2(O2C(t)Bu)4(HO2C(t)Bu)2] and either Ln(NO3)3·nH2O or [Ln2(O2C(t)Bu)6(HO2C(t)Bu)6] and tert-butylphosphonic acid or an amino-functionalized phosphonic acid. The clusters, with general formula [Cu(MeCN)4][Cu3Ln9(μ3-OH)7(O3P(t)Bu)6(O2C(t)Bu)15] and [Cu6Ln6(μ3-OH)6(O3PC(NH2)Me2)6(O2C(t)Bu)12], were structurally characterized through single crystal X-ray diffraction and possess highly symmetric metal cores with approximately C3v and D3h point symmetry, respectively. We have investigated the possible application of the isotropic analogues in magnetic cooling, where we were able to observe that up to around 70% of the theoretical magnetic entropy change is obtained. Simulation of the magnetic data shows antiferromagnetic coupling between the spin centers, which explains the magnetic entropy value observed.
authors.affiliation: †School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
authors.forename: Eufemio
authors.initials: E
authors.lastname: Moreno Pineda
authors.affiliation: §Faculty of Physics, University of Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany.
authors.forename: Christian
authors.initials: C
authors.lastname: Heesing
authors.affiliation: †School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
authors.forename: Floriana
authors.initials: F
authors.lastname: Tuna
authors.affiliation: †School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
authors.forename: Yan-Zhen
authors.initials: YZ
authors.lastname: Zheng
authors.affiliation: †School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
authors.forename: Eric J L
authors.initials: EJ
authors.lastname: McInnes
authors.affiliation: §Faculty of Physics, University of Bielefeld, Universitätsstrasse 25, D-33615 Bielefeld, Germany.
authors.forename: Jürgen
authors.initials: J
authors.lastname: Schnack
authors.affiliation: †School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
authors.forename: Richard E P
authors.initials: RE
authors.lastname: Winpenny