Several Nitrogen-containing Chelating Agent Complexes Calorimetry Study

Calorimetry is widely used to investigate the thermodynamic properties of substances and analyse the energetics during the reaction processes. However, only a few laboratories in the world are conducting the research on the basic thermodynamic properties of substances, so the thermodynamic data of many important compounds are unavailable till now, which causes great trouble to relevant research work. This thesis focuses on calorimetric studies of several chelating reagents.The energies of combustion of five chelateing regents such as N-benzoyl-N-phenylhydroxylamine(BPHA), a-benzoin oxime(BZOM), Salicylhydroxamic acid (SHDM), N-hydroxyphthalimide (NHPI) and 1-Phenyl-3-methyl-4-benzoyl-2-pyrazolin-5-one (HPMBP) in the cryst. state were measured in a static bomb adiabatic calorimeter, in pure oxygen at T = 298.15 K. The standard molar enthalpies of formation of the crystalline compounds, On the basis of experimental results of this work we derived the values for the standard molar enthalpies of formation of these chelating reagents, in the crystalline phase are (-100.46±0.98) kJ·mol^-1, (-126.11±5.60) kJ·mol^-1, (-396.75±5.54)kJ·mol^-1, (-291.37±2.92) kJ·mol^-1 and (-10.97±3.46) kJ·mol^-1, respectively.The complexes of divalent metals as Zn (Ⅱ), Cu(Ⅱ) with BPHA , BZOM, or HPMBP were synthesized. Basing on the themochemical cycles of reactions designed, the standard enthalpies of six complexes were mensurated by a SETARAM C80 calorimeter areΔ_fH_m^? [Zn(BPA)₂,s)] = -213.05±0.98kJ·mol^-1,Δ_fH_m^? [Cu(BPA)₂,s)] =104.47±0.98 kJ·mol^-1,Δ_fH_m^? [Zn(BZOM)₂,s)] = -207.76±12.48 kJ·mol^-1,Δ_fH_m^? [Cu(BZOM)₂,s)] = -135.48±12.48 kJ·mol^-1,Δ_fH_m^? [Zn(PMBP)₂,s)]=-14.60±5.28 kJ·mol^-1,Δ_fH_m^?[Cu(PMBP)₂,s)] =93.28±5.29 kJ·mol^-1。...