完整後設資料紀錄
DC 欄位 | 值 | 語言 |
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dc.contributor.author | Chang, C. Allen | en_US |
dc.contributor.author | Lin, Chih-Cheng | en_US |
dc.contributor.author | Kuo, Chien-Hung | en_US |
dc.date.accessioned | 2014-12-08T15:36:51Z | - |
dc.date.available | 2014-12-08T15:36:51Z | - |
dc.date.issued | 2014 | en_US |
dc.identifier.issn | 0095-8972 | en_US |
dc.identifier.uri | http://hdl.handle.net/11536/25259 | - |
dc.identifier.uri | http://dx.doi.org/10.1080/00958972.2014.945923 | en_US |
dc.description.abstract | The dissociation rates of LnODO2A(+) complexes (ODO2A(2-) is the deprotonated dianion of the ligand H(2)ODO2A, 1-oxa-4,7,10-triazacyclododecane-4,10-diacetic acid) are all faster than those of the corresponding LnDO2A(+) complexes (DO2A(2-) is the deprotonated dianion of the ligand H(2)DO2A, 1,4,7,10-tetraazacyclododecane- 1,7-diacetic acid), consistent with the fact that LnODO2A(+) complexes are kinetically more labile and thermodynamically less stable than the corresponding LnDO2A(+) complexes, and H(2)ODO2A is not pre-organized for Ln(3+) ion complexation but H(2)DO2A is. The dissociation kinetics of selected trivalent lanthanide (Ln(3+), Ln=La, Pr, Eu, Er, Lu) complexes of the macrocyclic ligand H(2)ODO2A (1-oxa-4,7,10-triazacyclododecane-4,10-diacetic acid), LnODO2A(+), were studied in the [H+] range (0.1-2.4) x 10(-4) M in the temperature range 15-45 degrees C. Excess Cu2+ ions were used as the scavenger for the ligand in acetate-acetic acid buffer medium. The dissociation reactions are independent of [Cu2+] and follow the rate law k(obs) =k(d) + k(AC)[Acetate] + K\'k(lim)[H+]/(1 + K\'[H+]), where k(d), k(AC), and k(lim) are the respective dissociation rate constants for the [H+]-independent, acetate-assisted, and the [H+]-dependent limiting pathways; K\' is the equilibrium constant for the protonation reaction LnODO2A(+) + H+ < > LnODO2AH(2+). The dissociation rates of LnODO2A(+) complexes are all faster than those of the corresponding LnDO2A(+) complexes (DO2A(2-) is the fully deprotonated dianion of the ligand H(2)DO2A, 1,4,7,10-tetrazacyclo-dodecane-1,7- diacetic acid), consistent with the notion that LnODO2A(+) complexes are kinetically more labile and thermodynamically less stable than the corresponding LnDO2A(+) complexes, and H(2)ODO2A is not pre-organized for Ln(3+) ion complexation but H(2)DO2A is. | en_US |
dc.language.iso | en_US | en_US |
dc.subject | Lanthanides | en_US |
dc.subject | Macrocyclic ligands | en_US |
dc.subject | ODO2A | en_US |
dc.subject | DO2A | en_US |
dc.subject | Dissociation kinetics | en_US |
dc.title | Dissociation kinetics of macrocyclic trivalent lanthanide complexes of 1-oxa-4,7,10-triazacyclododecane-4,10-diacetic acid (H(2)ODO2A) | en_US |
dc.type | Article | en_US |
dc.identifier.doi | 10.1080/00958972.2014.945923 | en_US |
dc.identifier.journal | JOURNAL OF COORDINATION CHEMISTRY | en_US |
dc.citation.volume | 67 | en_US |
dc.citation.issue | 13 | en_US |
dc.citation.spage | 2204 | en_US |
dc.citation.epage | 2216 | en_US |
dc.contributor.department | 交大名義發表 | zh_TW |
dc.contributor.department | 生物科技學系 | zh_TW |
dc.contributor.department | National Chiao Tung University | en_US |
dc.contributor.department | Department of Biological Science and Technology | en_US |
dc.identifier.wosnumber | WOS:000341444100003 | - |
dc.citation.woscount | 0 | - |
顯示於類別: | 期刊論文 |