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Complex formation reactions of two sterically hindered platinum(II) complexes with some N-bonding ligands

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Abstract

The kinetics of the complex formation reactions of two [(TLtBu)PtCl]+ and [Pt(tpdm)Cl]+ complexes (TLtBu = 2,6-bis[(1,3-di-tert-butylimidazolin-2-imino)methyl]pyridine and tpdm = terpyridinedimethane) with N-donor ligands, l-histidine (L-His), inosine (Ino), inosine-5′-monophosphate (5′-IMP) and guanosine-5′-monophosphate (5′-GMP), were studied. All reactions were studied under pseudo-first-order conditions as a function of nucleophile concentration and temperature in aqueous 0.1 M NaClO4 solution in the presence of 10 mM NaCl using variable-temperature Uv–Vis spectrophotometry. The order of reactivity of the studied ligands is L-His > Ino > 5′-GMP > 5′-IMP. This order of reactivity is in relation to their electronic properties and structures. The mechanism of the substitution reactions is associative in nature as supported by the negative entropy of activation.

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Abbreviations

TLtBu :

2,6-bis[(1,3-di-tert-butylimidazolin-2-imino)methyl]pyridine

Tpdm:

Terpyridinedimethane

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Acknowledgments

The authors gratefully acknowledge financial support from the Ministry of Education, Science and Technological Development of the Republic of Serbia, Project No. 172011.

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Correspondence to Jovana Bogojeski.

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Selimović, E., Vulović, T., Petrović, B. et al. Complex formation reactions of two sterically hindered platinum(II) complexes with some N-bonding ligands. Transition Met Chem 38, 635–640 (2013). https://doi.org/10.1007/s11243-013-9731-7

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