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This is the second example of a family of porous mixed d\u2010f MOFs containing high\u2010spin Fe<jats:sup>2+<\/jats:sup> centres. These materials were prepared from an eutectic mixture (1:1 molar ratio, choline chloride\/malonic acid) with a small amount of added water and isolated directly in large amounts as single crystalline phases. The structural details were revealed by single\u2010crystal X\u2010ray diffraction, variable\u2010temperature powder X\u2010ray diffraction, thermogravimetry, vibrational and M\u00f6ssbauer spectroscopy and electron microscopy (SEM and EDS). Networks are assembled by unusual [Fe<jats:sub>2<\/jats:sub>(Hpmida)<jats:sub>2<\/jats:sub>]<jats:sup>2\u2013<\/jats:sup> dimeric units, which connect to each other and to the lanthanide centres to form a 3D porous framework. The empty voids of this framework accommodate charge\u2010balancing Fe<jats:sup>3+<\/jats:sup> cations and uncoordinated water molecules, which are readily released without structural collapse at temperatures below 250 \u00b0C. The photoluminescence and magnetic properties of the compounds were studied at ambient and low temperature.<\/jats:p>","DOI":"10.1002\/ejic.201001145","type":"journal-article","created":{"date-parts":[[2011,2,18]],"date-time":"2011-02-18T06:11:30Z","timestamp":1298009490000},"page":"2035-2044","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Mixed\u2010Metal d\u2010f Phosphonate Frameworks \u2013 Photoluminescence and Magnetic Properties"],"prefix":"10.1002","volume":"2011","author":[{"given":"Jo\u00e3o","family":"Rocha","sequence":"first","affiliation":[]},{"given":"Filipe A.","family":"Almeida Paz","sequence":"additional","affiliation":[]},{"given":"Fa\u2010Nian","family":"Shi","sequence":"additional","affiliation":[]},{"given":"Duarte","family":"Ananias","sequence":"additional","affiliation":[]},{"given":"Nuno J. 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