Synthesis and magnetic properties of a new Cr(II) ammonium-ethyl-phosphonate: Cr1.5[H3N(CH2)2PO3](SO4)·2H2O

Bellitto, Carlo; Bauer, Elvira Maria; Righini, Guido; Altomare, Angela

doi:10.1016/j.jmmm.2003.12.1085

Cited by 2 publications

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“…Mn 3 (O 3 PCH 2 CH 2 CO 2 ) 2 11 is pillared and Mn(HO 3 PCH 2 COOH) 2 •2H 2 O 12 is layered which satisfies the bonding scheme imposed sby the stoichiometries of the organo-linking groups. There are also several chromium(II) phosphonates, and the following compounds can be highlighted, 15 All these compounds seem to have a layered network with interesting magnetic properties, although only the crystal structure of Cr[PO 3 CH 2 CH 2 NH 3 ]Cl•H 2 O has been solved. This compound shows a layered structure with Cr(II) cations in a distorted square pyramid formed by three oxygen atoms from the phosphonates, one oxygen from the water molecule and a chloride anion in the apical position.…”

Section: Introductionmentioning

confidence: 99%

Layered and pillared metal carboxyethylphosphonate hybrid compounds

et al. 2006

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A series of carboxyethylphosphonate hybrid materials has been prepared: Mn(II)(O3PCH2CH2COOH) *H2O (1), Mn(III)(OH)(O3PCH2CH2COOH)*H2O (2), Al3(III)(OH)3(O3PCH2CH2CO2)2 *3H2O (3) and Cr2(III)(OH)3(O3PCH2CH2CO2) *3H2O (4). Compounds 1 and 2 were synthesized from Mn(III)(CH3COO)3 *2H2O under hydrothermal, or refluxing treatments, respectively. The crystal structures of the manganese-bearing solids have been solved ab initio from laboratory X-ray powder diffraction data and refined by the Rietveld method. 1 crystallises in a orthorhombic cell and 2 in monoclinic symmetry. Both solids have inorganic 2D layered structures with the acid carboxylic groups pointing towards the interlayer space, and the layers linked only through hydrogen bonds. The inorganic layers of these compounds are formed by manganese atoms in distorted octahedral environments linked together by the phosphonate groups. The crystal structure of 3 has been solved ab initio from synchrotron X-ray powder diffraction data. This solid shows a pillared structure with the phosphonate and carboxylate groups cross-linking the inorganic layers. These layers contain chains of aluminium octahedra running parallel to each other. 4 is amorphous and the IR-UV-VIS spectra suggest a framework with Cr(III) cations in octahedral environments. Thermal, spectroscopic and magnetic data for manganese and chromium compounds as well as the structural details of these solids are discussed.

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Section: Introductionmentioning

confidence: 99%