Highlights Degradation of two polymeric phthalatocuprate(II) dihydrates was studied using TG/DSC/MS measurements, XRPD analysis and FT-IR spectroscopy. The reversibility of dehydration processes was identified using XRPD and TG/DSC analysis. Detail analysis of dehydration kinetics was studied using isoconversional and non-isoconversional methods. Thermodynamic and kinetic parameters for dehydration process have been determined. The dehydrated complexes were investigated as possible candidates for H2 adsorption, using molecular simulations.
AbstractThermal dehydration of two heterometallic complexes containing dianion of phthalic acid, pht, Na2[Cu(pht)2]·2H2O, 1, and K2[Cu(pht)2]·2H2O, 2, was investigated under non-isothermal conditions. Mechanism and kinetics of dehydration were analyzed in detail using TG/DSC/MS measurements, XRPD analysis and FT-IR spectroscopy. The reversibility of dehydration processes was identified. According to XRPD, dehydrated product of 1 maintains original structure, but dehydration of 2 undergoes structural transformation giving a dehydrated product of different crystal structure. In both cases dehydration process involves more than one elementary step, which was confirmed using isoconversional methods. Deconvolution of this process using Fraiser-Suzuki function yielded two single step processes for 1 and 2. Subsequent kinetic analysis was performed using Màlek algorithm, resulting in the determination of kinetic triplets (Ea, A and f(α)) for each individual step. In addition, the dehydrated complexes were investigated as possible candidates for H2 adsorption, using molecular simulations.2