Structural Characterization of Layered γ-Titanium Phosphate (C 6 H 13 NH 3 )[Ti(HPO 4 )(PO 4 )]·H 2 O
2005; American Chemical Society; Volume: 17; Issue: 25 Linguagem: Inglês
10.1021/cm051447f
ISSN1520-5002
AutoresLuís Mafra, Filipe A. Almeida Paz, João Rocha, Aránzazu Espina, Sergei A. Khainakov, José R. Garcı́a, Christian Fernandéz,
Tópico(s)Crystal Structures and Properties
ResumoAn organically templated titanium phosphate, (C6H13NH3)[Ti(HPO4)(PO4)]·H2O, has been prepared by hydrothermal synthesis from titanium(IV) chloride, phosphoric acid, and n-hexylamine. The structure of this material has been characterized by powder X-ray diffraction (XRD), 1H [including 1H{FS−Lee−Goldburg (LG)}−1H homonuclear correlation (HOMCOR), 1H double quantum (DQ), and 1H{FS-LG}−31P cross-polarization (CP) heteronuclear correlation (HETCOR)], 13C, and 31P magic-angle spinning (MAS) NMR, Fourier transform infrared (FTIR) spectroscopy, and thermal analyses [thermogravimetry (TG) and differential scanning calorimetry (DSC)]. Based on the empirical evidence, particularly solid-state NMR, modeling studies, and powder XRD, a crystal structure has been proposed, having unit cell parameters a = 5.089(2) Å, b = 6.335(2) Å, c = 22.792(5) Å, β = 102.48(2)°, space group P21, and Z = 2. This compound is built up of anionic titanium phosphate layers, similar to those present in the γ-type titanium phosphate, with n-hexylammonium cations intercalated in the interlayer space.
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