dc.contributor.author | Davies, MS | |
dc.contributor.author | Cox, JW | |
dc.contributor.author | Berners-Price, SJ | |
dc.contributor.author | Barklage, W | |
dc.contributor.author | Qu, Y | |
dc.contributor.author | Farrell, N | |
dc.date.accessioned | 2017-09-25T12:30:46Z | |
dc.date.available | 2017-09-25T12:30:46Z | |
dc.date.issued | 2000 | |
dc.date.modified | 2007-03-13T21:51:42Z | |
dc.identifier.issn | 0020-1669 | |
dc.identifier.doi | 10.1021/ic991104h | |
dc.identifier.uri | http://hdl.handle.net/10072/3212 | |
dc.description.abstract | By the use of [1H,15N] heteronuclear single quantum coherence (HSQC) 2D NMR spectroscopy and electrochemical methods we have determined the hydrolysis profile of the bifunctional dinuclear platinum complex [{trans-PtCl(15NH3)2}2(μ-15NH2(CH2)615NH2)]2+ (1,1/t,t (n = 6), 15N-1), the prototype of a novel class of potential antitumor complexes. Reported are estimates for the rate and equilibrium constants for the first and second aquation steps, together with the acid dissociation constant (pKa1 ≈ pKa2 ≈ pKa3). The equilibrium constants determined by NMR at 25 and 37 °C (I = 0.1 M) were similar, pK1 ≈ pK2 = 3.9 ± 0.2, and from a chloride release experiment at 37 °C the values were found to be pK1 = 4.11 ± 0.05 and pK2 = 4.2 ± 0.5. The forward and reverse rate constants for aquation determined from this chloride release experiment were k1 = (8.5 ± 0.3) × 10-5 s-1 and k-1 = 0.91 ± 0.06 M-1 s-1, where the model assumed that all the liberated chloride came from 1. When the second aquation step was also taken into account, the rate constants were k1 = (7.9 ± 0.2) × 10-5 s-1, k-1 = 1.18 ± 0.06 M-1 s-1, k2 = (10.6 ± 3.0) × 10-4 s-1, k-2 = 1.5 ± 0.6 M-1 s-1. The rate constants compare favorably with other complexes with the [PtCl(am(m)ine)3]+ moiety and indicate that the equilibrium of all these species favors the chloro form. A pKa value of 5.62 was determined for the diaquated species [{trans-Pt(15NH3)2(H2O)}2(μ-15NH2(CH2)615NH2)]4+ (3) using [1H,15N] HSQC NMR spectroscopy. The speciation profile of 1 and its hydrolysis products under physiological conditions is explored. | |
dc.description.peerreviewed | Yes | |
dc.description.publicationstatus | Yes | |
dc.language | English | |
dc.language.iso | eng | |
dc.publisher | American Chemical Society | |
dc.publisher.place | USA | |
dc.relation.ispartofpagefrom | 1710 | |
dc.relation.ispartofpageto | 1715 | |
dc.relation.ispartofjournal | Inorganic Chemistry | |
dc.relation.ispartofvolume | 39No 8 | |
dc.subject.fieldofresearch | Inorganic chemistry | |
dc.subject.fieldofresearch | Physical chemistry | |
dc.subject.fieldofresearch | Other chemical sciences | |
dc.subject.fieldofresearch | History, heritage and archaeology | |
dc.subject.fieldofresearchcode | 3402 | |
dc.subject.fieldofresearchcode | 3406 | |
dc.subject.fieldofresearchcode | 3499 | |
dc.subject.fieldofresearchcode | 43 | |
dc.title | Equilibrium and Kinetic Studies of the Aquation of the Dinuclear Platinum Complex ({trans-PtCI(NH3)2}2(uNH2(CH2)2+:pK Determinations of Aqua Ligands via (1H, 15N)NMR Spectroscopy | |
dc.type | Journal article | |
dc.type.description | C1 - Articles | |
dc.type.code | C - Journal Articles | |
gro.faculty | Griffith Sciences, Griffith Institute for Drug Discovery | |
gro.date.issued | 2000 | |
gro.hasfulltext | No Full Text | |
gro.griffith.author | Berners-Price, Sue J. | |