A trans influence and π-conjugation effects on ligand substitution reactions of Pt(II) complexes with tridentate pendant N/S-donor ligands

Simple item page
dc.contributor.authorKinunda, Grace
dc.date.accessioned2018-09-25T13:49:17Z
dc.date.available2018-09-25T13:49:17Z
dc.date.issued2018
dc.description.abstractThe rate of displacement of the chloride ligands by three neutral nucleophiles (Nu) of different steric demands, namely thiourea (TU), N,N’-dimethylthiourea (DMTU) and N,N,N,’Ntetramethylthiourea (TMTU) in the complexes viz; [Pt(II)(bis(2-pyridylmethyl)amine)Cl]ClO4, (Pt1), [Pt(II){N-(2-pyridinylmethyl)-8-quinolinamine}Cl]Cl, (Pt2), [Pt(II)(bis(2-pyridylmethyl)sulfide)Cl]Cl, (Pt3) and [Pt(II){8-((2-pyridylmethyl)thiol)quinoline}Cl]Cl, (Pt4) was studied under pseudo first-order conditions as a function of concentration and temperature using a stopped-flow technique and UV-Visible spectrophotometry. The observed pseudo first order rate constants for substitution reactions obeyed the simple rate law kobs =[Nu] k2. The results have shown that the chloro ligand in Pt(N^S^N) complexes is more labile by two orders of magnitude than Pt(N^N^N) complexes due to the high trans labilizing effect brought by the S donor atom. The quinoline based Pt(II) complexes (Pt2 and Pt4) have been found to be slow than their pyridine counterparts Pt1 and Pt3 due to poor π-acceptor ability of quinoline. Second-order kinetics and large negative activation entropies support an associative mode of activation.en_US
dc.identifier.citationGA Kinunda - Tanzania Journal of Science, 2018en_US
dc.identifier.issnISSN 0856-1761, e-ISSN 2507-7961
dc.identifier.urihttp://hdl.handle.net/20.500.11810/4922
dc.language.isoenen_US
dc.publisherCollege of Natural and Applied Sciences (CoNAS) of the University of Dar es Salaam (UDSM)en_US
dc.subjectSubstitutionen_US
dc.subjectnucleophilesen_US
dc.subjectpseudo first-orderen_US
dc.subjectassociativeen_US
dc.subjectentropyen_US
dc.titleA trans influence and π-conjugation effects on ligand substitution reactions of Pt(II) complexes with tridentate pendant N/S-donor ligandsen_US
dc.typeJournal Article, Peer Revieweden_US
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
A TRANS INFLUENCE AND π-CONJUGATION EFFECTS ON LIGAND.pdf
Size:
1.28 MB
Format:
Adobe Portable Document Format
Description:
full paper
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.71 KB
Format:
Item-specific license agreed upon to submission
Description:
Download
Collections
Chemistry Department