| dc.creator |
Nkabinde, Slindokuhle, V. |
|
| dc.creator |
Kinunda, Grace |
|
| dc.creator |
Jaganyi, Deogratius |
|
| dc.date |
2018-09-19T12:03:31Z |
|
| dc.date |
2018-09-19T12:03:31Z |
|
| dc.date |
2017 |
|
| dc.date.accessioned |
2021-05-03T13:19:56Z |
|
| dc.date.available |
2021-05-03T13:19:56Z |
|
| dc.identifier |
SV Nkabinde, G Kinunda, D Jaganyi - Inorganica Chimica Acta, 2017 - Elsevier |
|
| dc.identifier |
http://hdl.handle.net/20.500.11810/4915 |
|
| dc.identifier |
http://dx.doi.org/10.1016/j.ica.2017.05.054. |
|
| dc.identifier.uri |
http://hdl.handle.net/20.500.11810/4915 |
|
| dc.description |
The substitution kinetics of the complexes [Pt(II)(bis(2-pyridylmethyl)amine)H2O](ClO4)2, Ptdpa and [Pt(II)(bis(2-pyridylmethyl)sulfide)H2O](ClO4)2, Ptdps, with a series of azole nucleophiles: Imidazole (Im), 1-methylimidazole (MIm), 1,2-Dimethylimidazole (DIm), 1,2,4-triazole (Trz) and pyrazole (Pyz), were studied in an aqueous medium at constant ionic strength (0.1 M NaClO4). The substitution of the coordinated water ligand on the Pt(II) complexes by the azoles was studied under pseudo-first order conditions as a function of the incoming nucleophiles concentration and temperature using either stopped-flow techniques or UV-Vis spectroscopy. Ptdps was found to be more reactive (three magnitude higher) than Ptdpa. The second-order rate constant, k2, for all the nucleophiles ranged between 0.087 ± 0.005 and 0.926 ± 0.05 M−1 s−1 for Ptdpa and between 146 ± 4 and 1458 ± 10 M−1 s−1 for Ptdps. The rate of substitution of the aqua ligand is dependent on the strength of the σ-donor character and the π-acceptability of the trans atom to the leaving group. The observed reactivity trend for the azoles followed the trend, MIm > Im > DIm > Trz > Pyz. This reactivity trend correlates with the basicity, steric and electrophilic effects of the nucleophiles. The X-ray crystal structure of Ptdps–Cl is reported. |
|
| dc.language |
en |
|
| dc.publisher |
Elsevier |
|
| dc.subject |
Platinum(II) |
|
| dc.subject |
Substitution |
|
| dc.subject |
Kinetics |
|
| dc.subject |
Azoles |
|
| dc.title |
Mechanistic study of the substitution reactions of [Pt(II)(bis(2-pyridylmethyl)amine)H2O](ClO4)2 and [Pt(II)(bis(2-pyridylmethyl)sulfide)H2O](ClO4)2 with azole Nucleophiles. Crystal structure of [Pt(II)(bis(2-pyridylmethyl)sulfide)Cl]ClO4 |
|
| dc.type |
Journal Article, Peer Reviewed |
|