catena-Poly[[(4,4'-dimethyl-2,2'-bipyridine-κ(2) N,N')cadmium]-di-μ-bromido].

Area of Science:

• Coordination Chemistry
• Crystal Engineering
• Materials Science

Background:

• The synthesis and structural characterization of metal-organic coordination polymers are crucial for developing novel materials.
• Bipyridine ligands are versatile building blocks in coordination chemistry due to their chelating properties.
• Cadmium(II) bromide systems offer opportunities to explore diverse coordination geometries and network topologies.

Purpose of the Study:

• To elucidate the crystal structure of the polymeric compound [CdBr2(C12H12N2)]n.
• To investigate the coordination environment of the Cd(II) cation and the role of the ligand.
• To understand the factors contributing to the stabilization of the crystal packing.

Main Methods:

• Single-crystal X-ray diffraction was employed to determine the molecular and crystal structure.
• Analysis of coordination geometry and bonding interactions was performed.
• Intermolecular interactions, such as C-H⋯π interactions, were identified.

Main Results:

• The crystal structure reveals a six-coordinated Cd(II) cation in a distorted octahedral geometry.
• The cadmium cation is coordinated to two nitrogen atoms of the 4,4'-dimethyl-2,2'-bipyridine ligand and four bridging bromide anions.
• The bromide anions act as bridges, forming a one-dimensional polymeric chain along the c-axis.
• Weak C-H⋯π interactions between adjacent chains contribute to the overall three-dimensional packing.

Conclusions:

• The compound [CdBr2(C12H12N2)]n forms a 1D coordination polymer with a distorted octahedral cadmium center.
• The bridging nature of bromide anions is key to the formation of the polymeric structure.
• Intermolecular C-H⋯π interactions play a significant role in stabilizing the 3D crystal lattice.