International Journal of
Physical Sciences

  • Abbreviation: Int. J. Phys. Sci.
  • Language: English
  • ISSN: 1992-1950
  • DOI: 10.5897/IJPS
  • Start Year: 2006
  • Published Articles: 2569

Full Length Research Paper

Hydrothermal synthesis and structural characterization of an organically-templated open-framework trimolybdates

Chinyere A. Anyama
  • Chinyere A. Anyama
  • Inorganic Materials Chemistry Laboratory, Department of Pure and Applied Chemistry, University of Calabar, P. M. B. 1115, Calabar, Nigeria
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Grace E. Iniama
  • Grace E. Iniama
  • Inorganic Materials Chemistry Laboratory, Department of Pure and Applied Chemistry, University of Calabar, P. M. B. 1115, Calabar, Nigeria
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Joseph O. Ogar
  • Joseph O. Ogar
  • Inorganic Materials Chemistry Laboratory, Department of Pure and Applied Chemistry, University of Calabar, P. M. B. 1115, Calabar, Nigeria
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Ayi A. Ayi
  • Ayi A. Ayi
  • Inorganic Materials Chemistry Laboratory, Department of Pure and Applied Chemistry, University of Calabar, P. M. B. 1115, Calabar, Nigeria
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  •  Received: 27 July 2015
  •  Accepted: 02 October 2015
  •  Published: 16 October 2015

Abstract

A new one-dimensional coordination polymer formulated as [C2H10N2] [Mo3O10], 1, has been synthesized under hydrothermal conditions in the presence of ethylenediamine. The surface morphology of the as-synthesized product reveals colorless rod-like single crystals of 1. The compound crystallizes in monoclinic space group P21/n with a = 8.08 Å, b =14.39 Å, c = 8.89 Å; β = 97.76°, V = 1033.65(12) Å3, Z = 4. The structure is a one-dimensional chain consisting of [Mo3O10]2- clusters of Mo (VI) octahedral interspersed by the amine molecules. In the infrared spectrum of the compound, the symmetric stretching vibrational mode of the -NH2 group is observed at 3278 cm-1, while the band at 1604 cm -1 is assigned to scissoring mode of the –NH2 group. The peaks in the spectral range 1913 -2492 and 2962 cm -1 are attributed to -CH2 symmetric and asymmetric stretching vibrations respectively.  The  absorption  bands at 1404 cm -1 is due to  scissoring, while the one at 1149 cm-1  is attributable to twisting modes of - CH2 group . The characteristic band of the stretching vibrational modes of the Mo=O double  bonds is observed at 1018 cm-1, while the vibrational stretching frequency involving single Mo-O bonds is observed at 846 cm-1 and the scissoring mode of this bond is at 542 cm-1.
 
Key words: Hydrothermal synthesis, amine-templated molybdates, molybdenum oxide-organic frameworks, one-dimensional chain.