Basicity and Hydride-Donating Ability of Palladium(II) Hydride Complex with Diarylamido-bis-phosphine Pincer Ligand

V. A. Kulikova; Куликова В. А.; E. S. Shubina; Шубина Е. С.; O. A. Filippov; Филиппов О. А.; D. G. Yakhvarov; Яхваров Д. Г.; I. F. Sakhapov; Сахапов И. Ф.; A. A. Kagilev; Кагилев А. А.; Z. N. Gafurov; Гафуров З. Н.; E. I. Gutsul; Гуцул Е. И.; V. A. Kirkina; Киркина В. А.; N. V. Belkova; Белкова Н. В.

doi:10.31857/S0044457X23600858

Basicity and Hydride-Donating Ability of Palladium(II) Hydride Complex with Diarylamido-bis-phosphine Pincer Ligand

作者: Kulikova V.A.¹, Shubina E.S.¹, Filippov O.A.¹, Yakhvarov D.G.²^,3, Sakhapov I.F.², Kagilev A.A.²^,3, Gafurov Z.N.², Gutsul E.I.¹, Kirkina V.A.¹, Belkova N.V.¹
隶属关系:
1. A.N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences
2. A.E. Arbuzov Institute of Organic and Physical Chemistry, Federal Research Center “Kazan Scientific Center,” Russian Academy of Sciences
3. Kazan Federal University
期: 卷 68, 编号 9 (2023)
页面: 1226-1234
栏目: КООРДИНАЦИОННЫЕ СОЕДИНЕНИЯ
URL: https://rjraap.com/0044-457X/article/view/666233
DOI: https://doi.org/10.31857/S0044457X23600858
EDN: https://elibrary.ru/WPORKM
ID: 666233

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详细

The hydride ion transfer and proton transfer are the key steps in the reactions of (de)hydrogenation, dehydrocoupling, production of H2, and reduction of CO2 with the participation of transition metal hydrides; complexes with bifunctional ligands often act as catalysts for these transformations. The aim of this work was to study the hydride-donating properties of pincer palladium(II) hydride (PNP)PdH (1; PNP is bis(2-diisopropylphosphino-4-methylphenyl)amide). For this purpose, its reaction with Lewis acids (BF3·Et2O, B(C6F5)3) was studied using IR and NMR spectroscopies combined with quantum chemical calculations (DFT/M06/def2-TZVP). Correlations between electrochemical reduction potentials of the corresponding cations and thermodynamic hydridity of the metal hydrides proposed in the literature were also applied. [(PNP)Pd(MeCN)][BF4] undergoes an irreversible two-electron reduction in acetonitrile (
= –1.82 V). The use of the obtained potential in correlations gives an overestimated value of the hydride donating ability
It was found that the reaction of 1 with boron-containing Lewis acids unexpectedly leads to the protonation of the nitrogen atom of the pincer ligand with an impurity of water, rather than the reaction with the hydride ligand. According to DFT calculations, the proton affinity of the nitrogen atom is much higher than that of PdH, which determines its higher activity in protonation processes.

关键词

electrochemical reduction potential, cyclic voltammetry, proton affinity, water activation, Lewis acid

参考

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