Synthesis and Characterization of a New Layered Gallium Phosphonate Oxalate [C 2 H 10 N 2 ] 0.5 [Ga 3 (PO 3 CH 3 ) 4 (C 2 O 4 )].H 2 O

Abstract

Abstract: A new layered gallium phosphonate-oxalate hybrid material, [C 2 H 10 N 2 ] 0.5 [Ga 3 (PO 3 CH 3 ) 4 (C 2 O 4 )].H 2 O, denoted as MOP-1, was synthesized under mild hydrothermal conditions (150 °C) in the presence of ethylenediammonium ion (H 2 en) 2+ as structure-directing agent. The compound was structurally characterized by single-crystal X-ray diffraction (SCXRD), Fourier transformed infra-red spectroscopy (FTIR), and thermogravimetric analysis (TGA). Its structure consists of gallium phosphonate double layers formed of GaO 6 octahedra, GaO 4 tetrahedra, and PO 3 CH 3 groups sharing corners. The double layers are cross-linked by oxalate ligands to form a three-dimensional framework with intersecting channels where the ammonium ions and water molecules are located. The bridging oxalate ligand acts as a bidentate ligand to each Ga in octahedral coordination environment. Crystal data are as follows: Monoclinic P2 1 /n (14), a = 8.7530(5) Å; b = 16.3427(8) Å; c = 14.7522(8) Å; β = 93.284(1)°, V = 2106.8(2) Å 3 and Z = 4.