Synthesis of nanoporous poly(2-chloro-2-propen-1-ol) and its modification via ethylenediamine: vanadyl-catalyzed process, structural characterization, and CO2 sorption

Abstract

Currently, researchers are actively seeking chemical compounds capable of absorbing CO₂, as it is a major greenhouse gas. Our study focused on structural modifications in the synthesis of poly(2-chloro-2-propen-1-ol) to achieve a nanoporous architecture with enhanced CO₂ sorption. The catalytic synthesis of a novel poly(2-chloro-2-propen-1-ol) involved incorporating ethylenediamine (EDA) using a monocrystalline vanadyl acetylacetonate complex bound to 3-amino-2-chloropyridine. We designed the synthesis of a new monocrystalline compound – vanadyl acetylacetonate linked by a water molecule through a hydrogen bond to 3-amino-2-chloropyridine and physico-chemical properties were tested by XRD, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, MALDI-TOF-MS, coupling TG-FTIR, SEM, elementary analysis. The pore volume at p/p₀ = 0.99 is 0.03 cm³ g⁻¹. This system facilitated the production of polymeric materials like polyethylene, exhibiting remarkable catalytic activity: 4.17 × 10⁶ g (mol_V⁻¹ h⁻¹) for ethylene polymerization and 1.05 × 10⁷ g (mol_V⁻¹ h⁻¹) for 2-chloro-2-propen-1-ol oligomerization. The vanadyl catalyst allowed to synthesize novel materials derived from 2-chloro-2-propen-1-ol modified with EDA, resulting in a nanoporous structure. Structural modifications increased CO₂ sorption capacity nearly sevenfold, reaching 0.92 mmol g⁻¹. The new materials were characterized by both experimental and theoretical methods, highlighting the pivotal role of structural modifications in enhancing sorption properties.