Low-temperature equilibriums in solutions of isocyanide-phosphine complexes of palladium(II) chloride
- Авторы: Kinzhalov M.1, Buldakov A.1, Petrov A.1, Mahmudov K.2, Ivanov A.1, Suslonov V.1
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Учреждения:
- St. Petersburg State University
- Technical University of Lisbon
- Выпуск: Том 87, № 11 (2017)
- Страницы: 2605-2611
- Раздел: Article
- URL: https://journals.rcsi.science/1070-3632/article/view/221585
- DOI: https://doi.org/10.1134/S1070363217110159
- ID: 221585
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Аннотация
cis-[PdCl2(CNR)(PPh3)] [R = Cy, t-Bu, C(Me)2CH2C(Me)3] have been synthesized via the interaction of [(PPh3)ClPd(μ-Cl)2PdCl(PPh3)] with isocyanide in CH2Cl2 at room temperature with 90–98% yield and characterized by means of mass spectrometry as well as 1H, 13C{1H, 31P}, and 31P{1H} NMR spectroscopy. The complexes structure in the solid phase has been elucidated by means of X-ray diffraction analysis. Dynamic processes in the solutions of the complexes in CDCl3 and CD2Cl2 at temperature of–95 to 60°С have been studied by means of 1H and 31P NMR spectroscopy. It has been found that the studied compounds existed exclusively in the cis-[PdCl2(CNR)(PPh3)] form in the solutions. In the case of cis-[PdCl2(CNCy)(PPh3)] in CH2Cl2, the conformational transitions of the equilibrium forms (the transition of the substituent in the cyclohexyl cycle between the equatorial and axial positions) are slowed down, the equatorial conformer prevailing in the solution (2: 1 at–95°С). Quantum-chemical simulation (DFT) has revealed that the standard Gibbs energy of the conformational transition from the axial form of cis-[PdCl2(CNCy)(PPh3)] into the equatorial one in the CH2Cl2 solution at 178 K equals–2.5 kJ/mol, being in agreement with the experimental data.
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Об авторах
M. Kinzhalov
St. Petersburg State University
Автор, ответственный за переписку.
Email: m.kinzhalov@spbu.ru
Россия, Universitetskaya nab. 7–9, St. Petersburg, 199034
A. Buldakov
St. Petersburg State University
Email: m.kinzhalov@spbu.ru
Россия, Universitetskaya nab. 7–9, St. Petersburg, 199034
A. Petrov
St. Petersburg State University
Email: m.kinzhalov@spbu.ru
Россия, Universitetskaya nab. 7–9, St. Petersburg, 199034
K. Mahmudov
Technical University of Lisbon
Email: m.kinzhalov@spbu.ru
Португалия, Lisbon
A. Ivanov
St. Petersburg State University
Email: m.kinzhalov@spbu.ru
Россия, Universitetskaya nab. 7–9, St. Petersburg, 199034
V. Suslonov
St. Petersburg State University
Email: m.kinzhalov@spbu.ru
Россия, Universitetskaya nab. 7–9, St. Petersburg, 199034