Ionothermal synthesis of metal oxalatophosphonates with a three-dimensional framework structure: Na2M3(C2O 4)3(CH3PO3H)2 (M = FeII and MnII)

Chun Po Tsao, Chyi Yang Sheu, Ninh Nguyen, Kwang Hwa Lii

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Two isostructural transition-metal oxalatophosphonates, Na 2M3(C2O4)3(CH 3PO3H)2 (M = FeII and Mn II), have been synthesized by using a low-melting-point eutectic mixture of choline chloride and malonic acid as a solvent and characterized by single-crystal X-ray diffraction and 57Fe Mössbauer spectroscopy. The 3D framework structure consists of a corner-sharing octahedral trimer that is linked with other trimers through two distinct oxalate ligands with unusual linkage types, phosphonate tetrahedra, and H bonds to form infinite channels along the [101] direction where the Na+ cations are located. They are the first examples for the use of an ionic liquid as a solvent in the synthesis of metal oxalatophosphonates. Crystal data for the Fe compound follow: monoclinic, P21/n (No. 14), a = 5.8063(1) Å, b = 10.3867(3) Å, c = 14.8094(4) Å, β= 96.926(1)°, and Z = 2. Crystal data for the Mn compound are the same as those for the Fe compound except a = 5.8734(9) Å, b = 10.557(2) Å, c = 14.863(2) Å, and β = 96.691(2)°.

Original languageEnglish
Pages (from-to)6361-6364
Number of pages4
JournalInorganic Chemistry
Issue number16
StatePublished - 7 Aug 2006


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