Crystallization Kinetics of a Liquid-Forming 2D Coordination Polymer

Area of Science:

• Materials Science
• Crystallography
• Polymer Chemistry

Background:

• Two-dimensional coordination polymers exhibit unique properties.
• Understanding their thermal behavior, including melting and crystallization, is crucial for applications.

Purpose of the Study:

• To investigate the melting and crystallization mechanism of [Ag2(L1)(CF3SO3)2] (1).
• To characterize the thermal properties and structural changes during heating-cooling cycles.

Main Methods:

• Differential Scanning Calorimetry (DSC) for thermal events.
• Calorimetric, spectroscopic, and mechanical measurements for structural analysis.
• Rheological studies to determine melt viscosity and relaxation dynamics.

Main Results:

• Compound 1 melts at 282 °C and crystallizes abruptly at 242 °C.
• The melt exhibits exceptionally low viscosity (9.8 × 10^-2 Pa·s) at the melting point.
• Coordination-bond networks are partially retained in the melt, enabling fast recrystallization.

Conclusions:

• The low melt viscosity and high melting point facilitate rapid nucleation and crystal growth.
• The study provides insights into the dynamics of coordination polymer melts and their recrystallization.
• Findings are relevant for designing materials with controlled thermal responses.