Cerous sodium nitrate monohydrate, Na2Ce(NO3)5.H2O

Area of Science:

• Inorganic Chemistry
• Crystal Engineering
• Materials Science

Background:

• Cerium nitrate compounds are of interest due to their diverse coordination chemistry.
• Understanding the structural motifs of lanthanide nitrates is crucial for developing new materials.
• Sodium and cerium nitrates can form complex structures with varied coordination environments.

Purpose of the Study:

• To synthesize and determine the crystal structure of disodium cerium pentanitrate monohydrate.
• To elucidate the coordination environment of cerium and sodium ions.
• To investigate the role of nitrate ligands in the formation of the crystal network.

Main Methods:

• Single-crystal X-ray diffraction was employed for structural determination.
• Synthesis was performed using nitric acid solutions of cerium(III) nitrate hexahydrate and sodium nitrate.
• Structural analysis involved identifying coordination polyhedra and network formation.

Main Results:

• The crystal structure consists of isolated chains of irregular icosahedral [Ce(NO3)6]3- anions.
• Sodium ions are coordinated in square antiprismatic or monocapped square antiprismatic polyhedra.
• These sodium polyhedra share vertices, forming a three-dimensional network interspersed with water molecules.
• Ten nitrate groups function as bridging ligands, connecting various structural units.

Conclusions:

• Disodium cerium pentanitrate monohydrate exhibits a unique structure with discrete cerium-containing anions.
• The three-dimensional network is primarily constructed through the connectivity of sodium coordination polyhedra.
• The study provides insights into the coordination behavior of cerium and sodium in nitrate systems.