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Synthesis and Characterization of α‐Titanium Phosphate/Propylamine Intercalation Compounds Containing Transition‐Metal Ions
Author(s) -
Alfonso Belén F.,
Trobajo Camino,
Salvadó Miguel A.,
Pertierra Pilar,
GarcíaGranda Santiago,
RodríguezFernández Jesús,
Blanco Jesús A.,
García José R.
Publication year - 2005
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.200570036
Subject(s) - intercalation (chemistry) , monoclinic crystal system , crystallography , crystallinity , paramagnetism , transition metal , crystallite , ion , materials science , infrared spectroscopy , chemistry , inorganic chemistry , crystal structure , catalysis , biochemistry , physics , organic chemistry , quantum mechanics
Polycrystalline intercalated TiM x H 2−nx (PO 4 ) 2 · yC 3 H 7 NH 2 ·wH 2 O compounds with transition metal (TM) ions (M n+ = Co 2+ , Ni 2+ , Fe 3+ or Cr 3+ ) have been prepared by means of an indirect route and characterised using X‐ray diffraction, scanning electron microscopy, chemical and thermal analysis, X‐ray absorption and magnetic measurements. These novel pillared layered materials, which were obtained from the monoclinic ( P2 1 /c space group) α‐Ti(HPO 4 ) 2 ·H 2 O phase, lose its crystallinity after intercalation. However all the TM ions are octahedrally surrounded by 6 oxygen atoms, although the X‐ray absorption spectra evidence a clear dependence on the temperature. Surprisingly, all the materials behave as paramagnetic down to 1.5 K, but they exhibit different colours, what means that they are optically active (Co 2+ : violet; Ni 2+ : pale green; Fe 3+ : yellow; Cr 3+ : dark green).