BaMn(II) 2Mn(III)(PO4)3

Area of Science:

• Inorganic Chemistry
• Crystal Engineering
• Materials Science

Background:

• The synthesis and structural characterization of novel inorganic compounds are crucial for understanding chemical bonding and developing new materials.
• Manganese phosphates are of interest due to their diverse structural motifs and potential applications.

Purpose of the Study:

• To synthesize and determine the crystal structure of barium trimanganese tris-(ortho-phosphate).
• To compare the structure with known isotypic lead and strontium analogues.
• To elucidate the structural features, including atomic positions, symmetry, and bonding.

Main Methods:

• Hydrothermal synthesis was employed for the preparation of the title compound.
• Single-crystal X-ray diffraction was used to determine the atomic arrangement and crystal structure.
• Symmetry analysis was performed to identify atomic positions and site occupancies.

Main Results:

• Barium trimanganese tris-(ortho-phosphate), BaMn2(PO4)3, was successfully synthesized.
• The crystal structure is isotypic with lead and strontium analogues, featuring a complex framework.
• Two distinct chain types, one linear and one zigzag, composed of Mn-O octahedra and PO4 tetrahedra, form the structure.
• An open three-dimensional framework with channels parallel to [100] and [010] was identified, accommodating Ba(II) ions.
• Barium ions are coordinated by eight oxygen atoms in a distorted bicapped trigonal prism.

Conclusions:

• The hydrothermal synthesis yielded a novel barium manganese phosphate with a complex, open framework structure.
• The structural details provide insights into the coordination chemistry of manganese and barium in phosphate compounds.
• The findings contribute to the understanding of structure-property relationships in related inorganic materials.