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An Unprecedented Fe 36 Phosphonate Cage Christine M. Beavers (http://pubs.acs.org/author/Beavers%2C+Christine+M) † , Andrey V. Prosverin (http://pubs.acs.org/author/Prosverin%2C+Andrey+V) ‡ , John D. Cashion (http://pubs.acs.org/author/Cashion%2C+John+D) § , Kim R. Dunbar (http://pubs.acs.org/author/Dunbar%2C+Kim+R) * (http://pubs.acs.org/doi/abs/10.1021/ic3020145#cor1) ‡ , and Anne F. Richards (http://pubs.acs.org/author/Richards%2C+Anne+F) * (http://pubs.acs.org/doi/abs/10.1021/ic3020145#cor1) ⊥ ⊥ Department of Chemistry, La Trobe Institute for Molecular Sciences , Melbourne, Australia 3086 † Advanced Light Source, Lawrence Berkeley National Laboratory , 1 Cyclotron Road, MS15R217, Berkeley, California 94720, United States ‡ Department of Chemistry, Texas A&M University , College Station, Texas 77842, United States § School of Physics, Monash University , Melbourne, Australia 3800 Inorg. Chem. , 2013 , 52 (4), pp 1670–1672 DOI: 10.1021/ic3020145 Publication Date (Web): January 25, 2013 Copyright © 2013 American Chemical Society Abstract: The reaction of 2-pyridylphosphonic acid (LH 2 ) with iron(II) perchlorate and iron(III) nitrate afforded an interconnected, double-layered, cationic iron cage, [{Fe 36 L 44 (H 2 O) 48 }] 20+ ( 1a ), the largest interconnected, polynuclear ferric cage reported to date. Magnetic studies on 1a revealed antiferromagnetic coupling between the spins on adjacent Fe III ions. CSD Refcode MIDCEJ, *.stl files were made using the program Mercury