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Title: Synthesis and Characterization of New Iron Phosphatooxalates: [(S)-C5H14N2] [Fe4(C2O4)3(HPO4)2(H2O)2] and [(S)-C5H14N2] [Fe4(C2O4)3(HPO4)2]
Authors: Wen-Jung Chang
Hsiu-Mei Lin
Kwang-Hwa Lii
Contributors: 國立臺灣海洋大學:光電科學研究所
Date: 2001
Issue Date: 2018-12-21T08:15:00Z
Publisher: J. Solid State Chem.
Abstract: Abstract: Two new organically templated iron(II) phosphatooxalates, [(S)-C5H14N2] [Fe4(C2O4)3(HPO4)2(H2O)2] (1) and [(S)-C5H14 N2] [Fe4(C2O4)3(HPO4)2] (2), have been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction and Mössbauer spectroscopy. Crystal data are as follows: compound 1, triclinic, P1 (No. 1), a=7.6999(4) Å, b=7.9542(4) Å, c=9.8262(5) Å, α=74.8444(7)°, β=81.7716(8)°, γ=85.4075(8)°, V=574.34(8) Å3, Z=1, and R1=0.0255; compound 2, monoclinic, P21 (No. 4), a=7.5943(8) Å, b=7.8172(8) Å, c=18.318(2) Å, β=99.111(2)°, V=1073.8(3) Å3, Z=2, and R1=0.0281. The structure of 1 consists of dimers of edge-sharing FeO6 octahedra that are linked by phosphate and oxalate groups to generate a three-dimensional framework with intersecting tunnels parallel to the [100] and [010] directions. Diprotonated (S)-2-methylpiperazinium cations are located at the intersections of these tunnels. Compound 1 crystallizes as a minor product when a racemic mixture of 2-methylpiperazine is used in the synthesis, and can be prepared as a major product with a small amount of 2 if optically pure (S)-2-methylpiperzine is used. The structure of 2 is similar to that of 1 except that the coordination around the iron centers in the dimer are square pyramidal and octahedral. The two compounds are the first 3-dimensional phosphatooxalates containing a chiral amine.
Relation: 157(1) pp.233-239
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/51764
Appears in Collections:[光電科學研究所] 期刊論文

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