Hydrothermal synthesis and fluorescence of two layered mixed-valence vanadium materials

Abstract

Two 2-D layered mixed-valence vanadium materials, [H₂N(CH₂)₄NH₂]₄[V^IVOPO₄V^VO(OH)PO₄]₄ (1) and [H₂N(CH₂)₄NH₂]₂[V₈O₂₀] (2), have been synthesized under hydrothermal conditions and characterized by infrared spectroscopy, SEM, fluorescence spectroscopy, and single-crystal X-ray diffraction. The layer structure of 1 is composed of V^IVO₆ octahedra, PO₄ tetrahedra, and V^VO₅ tetragonal pyramids sharing corners. Compound 2 has a 2-D framework constructed from [VO₅] square pyramids sharing edges and corners. Adjacent [VO₅] layers are connected through the rings to generate a spiral-like inorganic framework with eight-membered ring channels. SEM shows morphology of 1 and 2. Compounds 1 and 2 show intra-ligand fluorescence emission.

Keywords:

• Mixed-valence
• Layered vanadium materials
• Hydrothermal synthesis
• Fluorescence

Acknowledgments

This work was supported by Scientific Research common program of Beijing Municipal Commission of Education (KM200510028005).