LUBAL, Přemysl, Mojmír KÝVALA, Petr HERMANN, Jana HOLUBOVÁ, Jan ROHOVEC, Josef HAVEL and Ivan LUKEŠ. Thermodynamic and kinetic study of Copper(II) Complexes with N-methylene(phenylphosphinic) Derivatives of Cyclen and Cyclam. Polyhedron. Velká Británie: Elsevier Science Ltd., 2001, vol. 20, No 1, p. 47-55. ISSN 0277-5387. |
Other formats:
BibTeX
LaTeX
RIS
@article{350672, author = {Lubal, Přemysl and Kývala, Mojmír and Hermann, Petr and Holubová, Jana and Rohovec, Jan and Havel, Josef and Lukeš, Ivan}, article_location = {Velká Británie}, article_number = {1}, keywords = {polyazamacrocycles phosphinic acids; cyclen and cyclam derivatives; copper(II) complexes; potentiometry; kinetics; stability constants}, language = {eng}, issn = {0277-5387}, journal = {Polyhedron}, title = {Thermodynamic and kinetic study of Copper(II) Complexes with N-methylene(phenylphosphinic) Derivatives of Cyclen and Cyclam}, volume = {20}, year = {2001} }
TY - JOUR ID - 350672 AU - Lubal, Přemysl - Kývala, Mojmír - Hermann, Petr - Holubová, Jana - Rohovec, Jan - Havel, Josef - Lukeš, Ivan PY - 2001 TI - Thermodynamic and kinetic study of Copper(II) Complexes with N-methylene(phenylphosphinic) Derivatives of Cyclen and Cyclam JF - Polyhedron VL - 20 IS - 1 SP - 47 EP - 47 PB - Elsevier Science Ltd. SN - 02775387 KW - polyazamacrocycles phosphinic acids KW - cyclen and cyclam derivatives KW - copper(II) complexes KW - potentiometry KW - kinetics KW - stability constants N2 - Equilibria of Cu(II) with newly synthetised ligands H4L1 and H4L2 were investigated by the glass electrode potentiometry at 25 degrees of Celsius and I = 0.1 M KNO3. A simple chemical model with metal:ligand molar ratio 1:1 was found in the systems. Presence of main species , CuL1 (log Beta = 20.37(4)) and CuL2 (log Beta = 17.19(2)) was also confirmed by MALDI-TOF/MS. The dissociation kinetics of the complexes was followed by spectrophotometry and mechanism of the dissociation was proposed. Activation parameters (activation enthalpy and entropy) of the dissociation were estimated. For Cu(II)-H4L1 system, the complex dissociation starts after protonization of phosphinic pendant arms and its mechasnism is similar to the decomplexation of [Cu(cyclen)]2+. The complex with H4L2 is kinetically much less stable and the proton transfer from phosphinic pendant arm to the azacycle plays a significant role in the reaction mechanism. ER -
LUBAL, Přemysl, Mojmír KÝVALA, Petr HERMANN, Jana HOLUBOVÁ, Jan ROHOVEC, Josef HAVEL and Ivan LUKEŠ. Thermodynamic and kinetic study of Copper(II) Complexes with N-methylene(phenylphosphinic) Derivatives of Cyclen and Cyclam. \textit{Polyhedron}. Velká Británie: Elsevier Science Ltd., 2001, vol.~20, No~1, p.~47-55. ISSN~0277-5387.
|