Poly[(μ-3,5-dinitro-benzoato)(μ-3,5-dinitro-benzoic acid)rubidium].

Area of Science:

• Inorganic Chemistry
• Crystallography
• Materials Science

Background:

• Metal-organic frameworks (MOFs) are advanced materials with tunable properties.
• Rubidium (Rb) based compounds are less explored in MOF research.
• 3,5-dinitrobenzoic acid is a versatile organic linker for coordination chemistry.

Purpose of the Study:

• To synthesize and characterize a novel 2D coordination framework involving rubidium.
• To investigate the coordination behavior of rubidium with 3,5-dinitrobenzoic acid.
• To explore the structural features, including hydrogen bonding and framework dimensionality.

Main Methods:

• Single-crystal X-ray diffraction was used to determine the crystal structure.
• The asymmetric unit was analyzed to understand the coordination environment of Rb(+).
• Intermolecular interactions, such as hydrogen bonds, were identified.

Main Results:

• A novel 2D coordination polymer, [Rb(C(7)H(3)N(2)O(6))(C(7)H(4)N(2)O(6))](n), was successfully synthesized.
• The rubidium cation is nine-coordinated by oxygen atoms from both benzoate anions and benzoic acid ligands.
• The framework is constructed through bridging carboxylate groups and nitro group linkages, forming a 2D network along the [110] direction.
• A short O-H⋯O hydrogen bond was observed between adjacent carboxylate/carboxy groups.

Conclusions:

• The study presents a new 2D Rb-based coordination framework with 3,5-dinitrobenzoic acid.
• The coordination polymer exhibits a unique nine-coordinate rubidium environment and specific hydrogen bonding.
• The findings contribute to the understanding of rubidium coordination chemistry and the design of novel framework materials.