Synthesis, characterization, and ab initio theoretical study of a molecularly imprinted polymer selective for...

Area of Science:

• Polymer Science
• Materials Chemistry
• Computational Chemistry

Background:

• Molecularly imprinted polymers (MIPs) are crucial for molecular recognition.
• Effective MIPs rely on precise molecular interactions during imprinting and recognition.
• Both covalent and noncovalent imprinting methods are utilized for creating specific recognition sites.

Purpose of the Study:

• To prepare a molecularly imprinted biocompatible polymer with high capacity and affinity for nickel(II) phthalocyanine tetrasulfonic acid.
• To investigate the synthesis, binding characteristics, and adsorption kinetics of the prepared MIP.
• To elucidate the molecular imprinting mechanisms using computational modeling.

Main Methods:

• Synthesis of a poly(allylamine) cross-linked with epichlorohydrin MIP.
• Characterization using UV-visible spectroscopy, FTIR spectroscopy, and ICP analysis.
• Evaluation of binding isotherms, capacities, and adsorption kinetics.
• Ab initio molecular orbital calculations (Hartree-Fock, MP2, DFT) and vibrational spectra simulation.

Main Results:

• A biocompatible MIP with high affinity and capacity for the target dye was successfully synthesized.
• Binding properties were correlated with the extent of template removal.
• Kinetic studies revealed diffusion mechanisms in the fine particulate MIP.
• Computational models accurately mimicked template-polymer interactions and predicted spectral data.

Conclusions:

• The developed MIP offers a promising platform for selective recognition of nickel(II) phthalocyanine tetrasulfonic acid.
• The study highlights the synergy between experimental characterization and theoretical calculations in understanding MIP behavior.
• The findings contribute to the rational design of advanced MIPs for various applications.