Low-temperature equilibriums in solutions of isocyanide-phosphine complexes of palladium(II) chloride

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Low-temperature equilibriums in solutions of isocyanide-phosphine complexes of palladium(II) chloride. / Kinzhalov, M. A.; Buldakov, A. V.; Petrov, A. V.; Mahmudov, K. T.; Ivanov, A. Yu; Suslonov, V. V.

In: Russian Journal of General Chemistry, Vol. 87, No. 11, 01.11.2017, p. 2605-2611.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{8bdf62947e164999854a24b329d26cfe,

title = "Low-temperature equilibriums in solutions of isocyanide-phosphine complexes of palladium(II) chloride",

abstract = "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.",

keywords = "isocyanide, palladium complex, phosphine, tautomeric equilibrium",

author = "Kinzhalov, {M. A.} and Buldakov, {A. V.} and Petrov, {A. V.} and Mahmudov, {K. T.} and Ivanov, {A. Yu} and Suslonov, {V. V.}",

year = "2017",

month = nov,

day = "1",

doi = "10.1134/S1070363217110159",

language = "English",

volume = "87",

pages = "2605--2611",

journal = "Russian Journal of General Chemistry",

issn = "1070-3632",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "11",

}

RIS

TY - JOUR

T1 - Low-temperature equilibriums in solutions of isocyanide-phosphine complexes of palladium(II) chloride

AU - Kinzhalov, M. A.

AU - Buldakov, A. V.

AU - Petrov, A. V.

AU - Mahmudov, K. T.

AU - Ivanov, A. Yu

AU - Suslonov, V. V.

PY - 2017/11/1

Y1 - 2017/11/1

N2 - 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.

AB - 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.

KW - isocyanide

KW - palladium complex

KW - phosphine

KW - tautomeric equilibrium

UR - http://www.scopus.com/inward/record.url?scp=85038424685&partnerID=8YFLogxK

U2 - 10.1134/S1070363217110159

DO - 10.1134/S1070363217110159

M3 - Article

AN - SCOPUS:85038424685

VL - 87

SP - 2605

EP - 2611

JO - Russian Journal of General Chemistry

JF - Russian Journal of General Chemistry

SN - 1070-3632

IS - 11

ER -

ID: 46318222