N,N-Bis(2-pyridylmethyl)-amine-N-ethyl-2-pyridine-2-carboxamide was synthesized and characterized according to the literature. At 25 ℃, I=0.1 mol/L KNO 3, the stability constants of the binary system formed by the li...N,N-Bis(2-pyridylmethyl)-amine-N-ethyl-2-pyridine-2-carboxamide was synthesized and characterized according to the literature. At 25 ℃, I=0.1 mol/L KNO 3, the stability constants of the binary system formed by the ligand with metal ions in ethanol aqueous solution were studied by pH potentiometric titration and the appropriate structures with respect to the titration species were proposed. The results show that the stability order of divalent metals binding to the ligand is Co<Ni>Cu<Zn which does not conform to the order of the Irving-Williams series. Then the abnormal property of copper complex is discussed.展开更多
The stability constants of 5-substituted phenanthroline-12-(2’-hydroxy 1-5substituted benzy1)-1,4,7,10-tetraazacyclotr and copper(Ⅱ) ternary drixed ligand complex compounds were detendned by pH method at 25.0±0...The stability constants of 5-substituted phenanthroline-12-(2’-hydroxy 1-5substituted benzy1)-1,4,7,10-tetraazacyclotr and copper(Ⅱ) ternary drixed ligand complex compounds were detendned by pH method at 25.0±0.1 ℃ in the presence of 0.1 mol·dm-3KNO3. The form of coordination macrocyclopolyamine ligandcopper(Ⅱ)-5-substituted phenanthroline in aqueous solution were studied. The formation of d-π back bonding between copper(Ⅱ ) and nitrogen heteronuclear aromatic base has been proved. The tendency of stability of the ternary complexes have been explained by electron effects and d-π back bonding.展开更多
Thermodynamic property of the title complex compounds was studide by pH method. The stability constans of binary and ternary complexes of cobalt(Ⅱ )-bipyridylα-amionoacids were determined at 25.0±0.1 ℃ in the ...Thermodynamic property of the title complex compounds was studide by pH method. The stability constans of binary and ternary complexes of cobalt(Ⅱ )-bipyridylα-amionoacids were determined at 25.0±0.1 ℃ in the presence of 0.1mol·dm-3 KNO3. The relationships between stability of complexes and strength of d-p back-donation bonding formed for cobalt(Ⅱ )-bipyridyl were discussed. The kinetic property of ternary system was studied by temperature-jump technique. The formation rate constants of ternary complexes were determined. The results show that thermodynamic stability and reaction rate related to the strength of acid and base of ligends. It was found again that linear free energy relationships exist.展开更多
文摘N,N-Bis(2-pyridylmethyl)-amine-N-ethyl-2-pyridine-2-carboxamide was synthesized and characterized according to the literature. At 25 ℃, I=0.1 mol/L KNO 3, the stability constants of the binary system formed by the ligand with metal ions in ethanol aqueous solution were studied by pH potentiometric titration and the appropriate structures with respect to the titration species were proposed. The results show that the stability order of divalent metals binding to the ligand is Co<Ni>Cu<Zn which does not conform to the order of the Irving-Williams series. Then the abnormal property of copper complex is discussed.
文摘The stability constants of 5-substituted phenanthroline-12-(2’-hydroxy 1-5substituted benzy1)-1,4,7,10-tetraazacyclotr and copper(Ⅱ) ternary drixed ligand complex compounds were detendned by pH method at 25.0±0.1 ℃ in the presence of 0.1 mol·dm-3KNO3. The form of coordination macrocyclopolyamine ligandcopper(Ⅱ)-5-substituted phenanthroline in aqueous solution were studied. The formation of d-π back bonding between copper(Ⅱ ) and nitrogen heteronuclear aromatic base has been proved. The tendency of stability of the ternary complexes have been explained by electron effects and d-π back bonding.
文摘Thermodynamic property of the title complex compounds was studide by pH method. The stability constans of binary and ternary complexes of cobalt(Ⅱ )-bipyridylα-amionoacids were determined at 25.0±0.1 ℃ in the presence of 0.1mol·dm-3 KNO3. The relationships between stability of complexes and strength of d-p back-donation bonding formed for cobalt(Ⅱ )-bipyridyl were discussed. The kinetic property of ternary system was studied by temperature-jump technique. The formation rate constants of ternary complexes were determined. The results show that thermodynamic stability and reaction rate related to the strength of acid and base of ligends. It was found again that linear free energy relationships exist.
