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Title: Hydrothermal synthesis, characterization and magnetic properties of (N{sub 4}C{sub 6}H{sub 21}).(Co(H{sub 2}PO{sub 4})(HPO{sub 4}){sub 2})

The title compound (N{sub 4}C{sub 6}H{sub 21}).(Co(H{sub 2}PO{sub 4})(HPO{sub 4}){sub 2}), was prepared hydrothermally (473 K, 10 days, autogenous pressure), in the presence of the tris(2-aminoethyl)amine as organic template. Its structure is built up from a network of four membered-rings, formed by the vertex linkages between [CoO{sub 4}] and [H{sub 2}PO{sub 4}] tetrahedra with [HPO{sub 4}] moieties hanging from the Co center. Hydrogen bonds involving the cobalt phosphate units and the triply protonated amine molecule, contribute to the stability of the structure. The IR spectrum shows bands characteristic of the (N{sub 4}C{sub 6}H{sub 21}){sup 3+} cations and the (H{sub 2}PO{sub 4}){sup -} and (HPO{sub 4}){sup 2-} phosphate anions. The UV-Visible-NIR spectrum confirms the tetrahedral coordination of Co{sup 2+} ions. The TGA analysis indicates that the dehydration of (N{sub 4}C{sub 6}H{sub 21}).(Co(H{sub 2}PO{sub 4})(HPO{sub 4}){sub 2}) occurs in one step. Magnetic measurements from 4.5 to 305 K show a weak antiferromagnetic character of this compound.
Authors:
 [1] ;  [2] ;  [3]
  1. Unite de Recherche 99/UR12-30, Departement de Chimie, Faculte des Sciences de Bizerte, 7021 Jarzouna (Tunisia)
  2. ITODYS, UMR-CNRS 7086, Universite Paris 7, 2 Place Jussieu (Case 7090), 75251 Paris (France)
  3. Unite de Recherche 99/UR12-30, Departement de Chimie, Faculte des Sciences de Bizerte, 7021 Jarzouna (Tunisia). E-mail: leila.smiri@fsb.rnu.tn
Publication Date:
OSTI Identifier:
20891566
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 40; Journal Issue: 8; Other Information: DOI: 10.1016/j.materresbull.2005.04.015; PII: S0025-5408(05)00132-7; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; AMINES; ANIONS; ANTIFERROMAGNETISM; CATIONS; COBALT IONS; COBALT PHOSPHATES; DEHYDRATION; HYDROTHERMAL SYNTHESIS; INFRARED SPECTRA; MAGNETIC PROPERTIES; THERMAL GRAVIMETRIC ANALYSIS; X-RAY DIFFRACTION