Re-refinement of dineodymium tris-[sulfate-(VI)] tetra-hydrate

Area of Science:

• Inorganic Chemistry
• Crystal Engineering
• Materials Science

Background:

• Neodymium sulfate tetrahydrate, [Nd2(SO4)3(H2O)4]n, is a coordination polymer with a previously reported crystal structure.
• Accurate structural data is crucial for understanding the properties and potential applications of inorganic materials.

Purpose of the Study:

• To re-refine the crystal structure of [Nd2(SO4)3(H2O)4]n using modern X-ray diffraction techniques.
• To improve the precision and accuracy of the existing structural data.
• To fully characterize the coordination environments of neodymium ions and the role of hydrogen bonding.

Main Methods:

• Single-crystal X-ray diffraction using a CCD detector.
• Re-refinement of crystallographic data.
• Analysis of coordination geometry and hydrogen bonding interactions.

Main Results:

• The crystal structure was refined with improved precision and accuracy compared to the original report.
• Two crystallographically independent neodymium(III) sites were identified, exhibiting capped square-anti-prismatic and square-anti-prismatic coordination.
• A framework structure formed by bridging sulfato ligands was confirmed.
• All hydrogen atoms were located, participating in medium to weak O-H⋯O hydrogen bonds.

Conclusions:

• The re-refined crystal structure of neodymium sulfate tetrahydrate provides a more accurate description of its atomic arrangement.
• The presence of two distinct neodymium coordination environments and the hydrogen bonding network are key features of this inorganic framework.
• This detailed structural information is valuable for further studies on lanthanide sulfates and coordination polymers.