Novel tailormade Bi4MO4(PO4)2 structural type (M = Mg, Zn).

Area of Science:

• Solid-state chemistry and materials science.
• Crystal engineering and inorganic synthesis.

Background:

• Exploration of the Bi(2)O(3)-MO-P(2)O(5) ternary system.
• Previous studies focused on 1D ribbon-like structural units.

Purpose of the Study:

• To synthesize and characterize novel 2D infinite end-member compounds.
• To investigate the structural organization and properties of new bismuth phosphates.
• To explore the self-assembly of secondary building units (SBUs) into predicted architectures.

Main Methods:

• Single-crystal and powder X-ray diffraction (XRD) as a function of temperature.
• High-temperature Phosphorus-31 Nuclear Magnetic Resonance ((31)P NMR).
• Transmission electron microscopy (TEM) for structural analysis.
• Preliminary electrical characterization.

Main Results:

• Discovery of novel Bi(4)MO(4)(PO(4))(2) compounds (M = Mg, Zn) featuring 2D [Bi(2)O(2)](2+) derivatives.
• Identification of supercell orderings in Mg and Zn compounds compared to ideal structures.
• Observation of a phase transition to the ideal lattice in the Mg compound above 450 °C.
• Formation of a three-dimensional (3D) architecture despite the 2D conceptual assembly, due to strong interbonds.

Conclusions:

• Successful synthesis of tailormade bismuth phosphate compounds with extended 2D structural motifs.
• Demonstration of versatile organization of secondary building units (SBUs) leading to complex 3D architectures.
• Insights into structure-property relationships and potential for designing novel inorganic materials.