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Organically templated vanadyl selenites with layered structures.

Intyaj Pasha1, Amitava Choudhury, C N R Rao

  • 1Chemistry and Physics of Materials Unit, CSIR Centre of Excellence in Chemistry, Jawaharlal Nehru Centre for Advanced Scientific Research, Jakkur P.O., Bangalore 560 064, India.

Inorganic Chemistry
|April 16, 2003
PubMed
Summary

Two novel vanadyl selenite compounds were synthesized using hydrothermal methods. These compounds exhibit unique layered structures, including a ladder motif and a V4O18 cluster, showcasing the potential of selenite units in designing open-framework materials.

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Area of Science:

  • Inorganic Chemistry
  • Materials Science
  • Crystallography

Background:

  • Vanadyl selenites are an emerging class of inorganic compounds with potential applications in materials science.
  • Hydrothermal synthesis offers a versatile route for preparing complex inorganic structures.
  • Open-framework materials are of significant interest due to their tunable properties and diverse applications.

Purpose of the Study:

  • To synthesize and characterize novel two-layered vanadyl selenite compounds.
  • To investigate the structural diversity and potential of selenite units in framework construction.
  • To explore the formation of unique structural motifs, such as ladder structures and clusters.

Main Methods:

  • Hydrothermal synthesis utilizing sodium vanadate (NaVO3) with selenium dioxide (SeO2) or selenic acid (H2SeO4) in the presence of organic amines.

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  • Single-crystal X-ray diffraction for detailed structural analysis of the synthesized compounds.
  • Characterization of crystallographic data including space group, lattice parameters, and atomic coordinates.

    • Main Results:

    • Two layered vanadyl selenites, [DABCOH2]0.5[(VIVO)(HSeO3)(SeO3)].H2O (I) and [enH2][(VivO)2-(VVO)O2(SeO3)3]-.1.25H2O (II), were successfully synthesized.
    • Compound I exhibits an orthorhombic crystal structure (space group Pbcn) featuring a ladder motif.
    • Compound II displays a triclinic crystal structure (space group P1) with a secondary building unit comprising a V4O18 cluster, SeO3, and VO5 groups.

    Conclusions:

    • The selenite unit is a valuable building block for designing intricate open-framework structures.
    • Hydrothermal synthesis in the presence of organic amines provides a viable method for creating novel vanadyl selenite materials.
    • The diverse structural outcomes highlight the versatility of vanadium and selenium in coordination chemistry and materials design.