Cover image for Vol. 17 Issue 22

Editor: Greta Heydenrych; Editorial Board Chairs: Christian Amatore, Michael Grätzel, Michel Orrit

Impact Factor: 3.138

ISI Journal Citation Reports © Ranking: 2015: 8/35 (Physics Atomic Molecular & Chemical); 50/144 (Chemistry Physical)

Online ISSN: 1439-7641

Associated Title(s): Advanced Materials, ChemBioChem, ChemCatChem, ChemElectroChem, ChemPhotoChem, ChemSusChem, Small

Cover Picture

8-9/2001The cover picture shows the icosidodecahedral Fe30 skeleton that constitutes the magnetic substructure of the [Mo72Fe30O252(Mo2O7(H2O))2(Mo2O8H2(H2O))(CH3COO)12(H 2O)91] Keplerate (represented in background), the largest molecular paramagnet synthesized to date. Comprehensive magnetization measurements have been performed for magnetic fields up to 60 Tesla and for temperatures down to 100 mK. In parallel, a Heisenberg model of interacting classical spins was adopted and several theoretical methods were invoked to determine its properties. The theoretical results are in very good agreement with the experimental data, and departures from the classical Heisenberg model are expected to be manifested only below 50 mK. On cooling in weak fields, the 30 spin vectors, depicted by the arrows, may be described as approaching a highly symmetrical, frustrated, coplanar spin configuration that is characterized by three (red, green, and blue) subsets of 10 parallel spins. The common spin direction of any one subset differs by 120° from that of any other subset. Find out more in the Concept by Luban et al. on pages 517–521.

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