Exceptional temperature-dependent coordination sites from acylamide groups

Area of Science:

• Coordination Chemistry
• Materials Science
• Supramolecular Chemistry

Background:

• Acylamide ligands are versatile building blocks in coordination chemistry.
• Controlling ligand coordination modes is crucial for designing novel materials.
• Cadmium-based coordination polymers exhibit diverse structures and potential applications.

Purpose of the Study:

• To investigate the effect of reaction temperature on the coordination behavior of an acylamide ligand.
• To synthesize and characterize new cadmium coordination polymers with tunable structures.
• To explore the relationship between reaction conditions and the resulting coordination modes.

Main Methods:

• Solvothermal synthesis was employed to create the coordination polymers.
• Reaction temperature was systematically varied to control ligand coordination.
• Single-crystal X-ray diffraction was used for structural determination.
• Elemental analysis and thermogravimetric analysis were performed for characterization.

Main Results:

• Two distinct cadmium coordination polymers, Cd3(L)2(bdc)3·4(H2O) (1) and Cd(L)(bdc)·2(H2O) (2), were successfully synthesized.
• The coordination mode of the acylamide ligand (L) was effectively controlled by altering the reaction temperature.
• The presence or absence of the oxygen coordination site on the ligand was dependent on the reaction temperature.
• The crystal structures revealed different network topologies based on the coordination mode.

Conclusions:

• Reaction temperature is a critical parameter for controlling ligand coordination in the synthesis of cadmium coordination polymers.
• The study demonstrates a method for tuning the structure of coordination polymers by manipulating reaction conditions.
• The synthesized coordination polymers represent new examples of metal-organic frameworks with potential for further investigation.