Na2MoO2As2O7.

Area of Science:

• Inorganic Chemistry
• Solid-State Chemistry
• Crystal Engineering

Background:

• Molybdenum arsenates are a class of inorganic compounds with potential applications in materials science.
• Understanding the crystal structures of novel compounds is crucial for predicting their properties and exploring new materials.
• The synthesis and characterization of complex inorganic frameworks provide insights into structure-property relationships.

Purpose of the Study:

• To synthesize and characterize a novel disodium molybdenum dioxide diarsenate compound.
• To elucidate the crystal structure of Na2MoO2As2O7 using solid-state reaction methods.
• To explore the structural relationships between Na2MoO2As2O7 and other related inorganic compounds.

Main Methods:

• Solid-state reaction synthesis.
• X-ray crystallography for structure determination.
• Analysis of structural features, including coordination environments and framework topology.

Main Results:

• Disodium molybdenum dioxide diarsenate, Na2MoO2As2O7, was successfully synthesized.
• The crystal structure consists of a 3D framework built from MoAs2O12 units with tunnels for Na+ cations.
• As(V) atoms exhibit tetrahedral coordination forming As2O7 groups, and Mo(VI) atoms are octahedrally coordinated with displacement from the center.
• Two Na+ cations display disorder around inversion centers.

Conclusions:

• The synthesized Na2MoO2As2O7 possesses a unique three-dimensional framework structure.
• The study provides a detailed structural description and highlights the disordered nature of sodium cations.
• Structural comparisons with related compounds like A2MoO2As2O7 and AMOP2O7 were discussed, offering a broader perspective on this class of materials.