Kinetics and mechanism of the substitution reactions of some bifunctional palladium(II) complexes with different nitrogen-donor heterocycles

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• 作者：Milica Kosović ; Željko Jaćimović ; Živadin D. Bugarčić…
• 刊名：Transition Metal Chemistry
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：41
• 期：2
• 页码：161-168
• 全文大小：671 KB
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• 作者单位：Milica Kosović (1)
  Željko Jaćimović (1)
  Živadin D. Bugarčić (2)
  Biljana V. Petrović (2)
  
  1. Faculty of Metallurgy and Technology, University of Montenegro, Cetinski put, 81000, Podgorica, Montenegro
  2. Department of Chemistry, Faculty of Science, University of Kragujevac, Radoja Domanovica 12, P. O. Box 60, Kragujevac, 34000, Serbia
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1572-901X

文摘

Substitution reactions of three Pd(II) complexes, [Pd(cbdca)Cl₂]2− (cbdca = cyclobutane-1,1-dicarboxylato), [Pd(ox)Cl₂]2− (ox = oxalato) and [Pd(mal)Cl₂]2− (mal = malonato), with different five- and six-membered N-heterocycles, such as pyrazole, 3-amino-4-iodo-pyrazole (pzI), 5-amino-4-bromo-3-methyl-pyrazole (pzBr), 1,2,4-triazole, pyrazine, imidazole, pyridazine and pyrimidine, were investigated in aqueous 0.10 M NaClO₄ with the presence of 20 mM NaCl using variable-temperature stopped-flow spectrophotometry. Substitution of these complexes occurs in two consecutive reversible steps, and their reactivity decreases in order [Pd(cbdca)Cl₂]2− > [Pd(mal)Cl₂]2− > [Pd(ox)Cl₂]2−. The most reactive nucleophile among the five-membered heterocycles is imidazole, while pyridazine is the most reactive among the six-membered heterocycles. Activation parameters were determined for all reactions, and negative values for entropy of activation, ΔS≠, support an associative mode of substitution. The reaction between [Pd(mal)Cl₂]2− complex and pzBr was investigated by 1H NMR, and the obtained results confirm that substitution with nitrogen-donor nucleophile does not lead to decomposition of the complex. Electronic supplementary materialThe online version of this article (doi:10.​1007/​s11243-015-0008-1) contains supplementary material, which is available to authorized users.