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New structurally diverse photoactive cadmium coordination polymers.

Ning Wang1, Bing-Fan Long1, Xian-Hong Yin1

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Four new coordination polymers (CP1-CP4) using cadmium ions and diverse ligands were synthesized. These materials exhibit unique structures and enable solid-state [2+2] photodimerization of alkene ligands within their frameworks.

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Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Crystallography

Background:

  • Coordination polymers (CPs) offer tunable structures for diverse applications.
  • Secondary building units (SBUs) are crucial for constructing complex CP architectures.
  • Photodimerization in the solid state is a key reaction for materials modification.

Purpose of the Study:

  • To design and synthesize novel coordination polymers with cadmium(II) ions.
  • To investigate the structural diversity and motifs of the resulting CPs.
  • To explore the potential for solid-state [2+2] photodimerization within these CPs.

Main Methods:

  • Solvothermal synthesis of coordination polymers using Cd(II) ions and specific carboxylate and alkene ligands.
  • Single-crystal X-ray diffraction for structural determination of CP1-CP4.
  • Analysis of crystal structures to identify secondary building units and network topologies.
  • Investigation of solid-state photodimerization of encapsulated alkene ligands.

Main Results:

  • Four coordination polymers (CP1-CP4) with Cd2 binuclear SBUs were successfully synthesized.
  • Diverse structural motifs were observed, including interdigitated 2D layers, 1D channel-like structures, and polycatenated frameworks.
  • All CPs were capable of facilitating solid-state [2+2] photodimerization of the alkene ligand (CH3-bpeb).
  • Desolvation of CP3 led to reduced fluorescence and a slower photodimerization rate.

Conclusions:

  • The choice of ligands and reaction conditions dictates the final structure of Cd(II)-based coordination polymers.
  • The designed CPs provide a platform for studying solid-state photodimerization reactions.
  • Structural and chemical changes (e.g., desolvation) can influence the reactivity and properties of coordination polymers.