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Volumn 27, Issue 21, 2008, Pages 5723-5732

Preparation and reactivities of PCP-type pincer complexes of nickel. Impact of different ligand skeletons and phosphine substituents

Author keywords

[No Author keywords available]

Indexed keywords

CRYSTALLOGRAPHY; CYCLIC VOLTAMMETRY; LIGANDS; NICKEL ALLOYS; PHOSPHORUS COMPOUNDS; SINGLE CRYSTALS;

EID: 56049095036     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om8005454     Document Type: Article
Times cited : (105)

References (82)
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    • For some of the original reports on PCP-type pincer complexes see: a
    • For some of the original reports on PCP-type pincer complexes see: (a) Moulton, C. J.; Shaw, B. L. Dalton Trans. 1976, 1020.
    • (1976) Dalton Trans , pp. 1020
    • Moulton, C.J.1    Shaw, B.L.2
  • 39
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    • For examples of PCP complexes of nickel see ref. 1a and:(a) Kennedy, A. R, Cross, R. J, Muir, K. W. Inorg. Chim. Acta 1995, 231, 195
    • For examples of PCP complexes of nickel see ref. 1a and:(a) Kennedy, A. R.; Cross, R. J.; Muir, K. W. Inorg. Chim. Acta 1995, 231, 195.
  • 52
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    • 4, the Cl analogue of 1, have been reported recently. Castonguay, A.; Beauchamp, A. L.; Zargarian, D. Acta Crystallogr. 2007, E63, m196.
    • 4, the Cl analogue of 1, have been reported recently. Castonguay, A.; Beauchamp, A. L.; Zargarian, D. Acta Crystallogr. 2007, E63, m196.
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    • Cambridge Structural Database search (Version 5.28 with updates up to November 2006): Allen, F. H. Acta Crystallogr. 2002, B58, 380.
    • Cambridge Structural Database search (Version 5.28 with updates up to November 2006): Allen, F. H. Acta Crystallogr. 2002, B58, 380.
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    • z hybrid orbital and the symmetry-related MO on the Ph moiety.
    • z hybrid orbital and the symmetry-related MO on the Ph moiety.
  • 56
    • 56049104791 scopus 로고    scopus 로고
    • sp bond distance in 5 to the mean of all the Ni-alkynyl bond lengths reported in the literature.
    • sp bond distance in 5 to the mean of all the Ni-alkynyl bond lengths reported in the literature.
  • 57
    • 56049088629 scopus 로고    scopus 로고
    • In the case of the reaction involving Ni-Ph (6) or Ni-Bu (7, some uncharacterized minor products were noted by 31P(1H) NMR spectroscopy
    • 1H) NMR spectroscopy.
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    • The spectral assignments for Ni-Cl and Ni-I derivatives were confirmed against the independently prepared samples from the reaction of 2 with AgCl and anhydrous NiI2 with i-Pr2P(CH2) 5P(i-Pr)2, respectively. Selected spectral data for (PCsp3P1-Pr)NiCl: 13C{1H} NMR (C6D6, 17.57 (s, CH(CH3)2, 2C, 18.63 (s, CH(CH3)2, 2C, 19.28 (s, CH(CH3) 2, 2C, 19.66 (s, CH(CH3)2, 2C, 21.78 (vt, vJPC, 10.7 Hz, CH2P, 2C, 22.89 (vt, vJPC, 10.3 Hz, CH(CH3)2, 2C, 24.98 (vt, vJPC, 9.3 Hz, CH(CH3)2,2C, 39.01 (vt, vJPC= 9.3 Hz, CH2CH2P, 2C, 48.74 t, 2JPC, 9.7 Hz, CHNi, 1C, 31P{1H} NMR
    • 6): 70.5.
  • 64
    • 56049102722 scopus 로고    scopus 로고
    • 31P signal for 4 as the only signal during the course of the catalysis and in the final reaction mixture suggests that the only P-bearing species involved in the coupling reaction are (PCP)NiX (X = Cl, Me).
    • 31P signal for 4 as the only signal during the course of the catalysis and in the final reaction mixture suggests that the only P-bearing species involved in the coupling reaction are (PCP)NiX (X = Cl, Me).
  • 65
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    • ̇ radicals, is often proposed for the observation of homocoupling products. See for instance: Tsou, T. T.; Kochi, J. K. J. Am. Chem. Soc. 1979, 101, 7547.
    • ̇ radicals, is often proposed for the observation of homocoupling products. See for instance: Tsou, T. T.; Kochi, J. K. J. Am. Chem. Soc. 1979, 101, 7547.
  • 66
    • 56049088124 scopus 로고    scopus 로고
    • It should be noted that a differential pulse voltammetry experiment performed under the same conditions on ferrocene and complex 2 has established that the latter shows a similar redox behavior to ferrocene in terms of one-electron redox process: W1/2(ferrocene) ∼185 mV; W1/2 (complex 2) ∼170 mV
    • 1/2 (complex 2) ∼170 mV.
  • 67
    • 56049120944 scopus 로고    scopus 로고
    • sp3P ligand should not be suited to stabilizing an unpaired electron, but this alternative explanation cannot be ruled out.
    • sp3P ligand should not be suited to stabilizing an unpaired electron, but this alternative explanation cannot be ruled out.
  • 68
    • 56049101274 scopus 로고    scopus 로고
    • We believe that the disorder found in single crystals obtained from this compound arises from the presence of a mixture of Cl and Br atoms in the coordination sphere of NiIII
    • III.
  • 69
    • 56049117761 scopus 로고    scopus 로고
    • The corresponding value for the second independent molecule of the asymmetric unit was found to be 0.331 Å
    • The corresponding value for the second independent molecule of the asymmetric unit was found to be 0.331 Å.
  • 70
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    • The τ parameter is calculated according to the relationship τ = (β-α)/60, wherein α and β refer to the largest basal angles in the complex (β > α); values approaching zero imply small degrees of deviation from an ideal square-pyramidal geometry, whereas values approaching 1 signal significant distortions toward a trigonal bipyramidal geometry: Addison, A. W.; Rao, T. N.; Reedijk, J.; van Rijn, J.; Verschoor, G. C. J. Chem. Soc., Dalton Trans. 1984, 1349.
    • The τ parameter is calculated according to the relationship τ = (β-α)/60, wherein α and β refer to the largest basal angles in the complex (β > α); values approaching zero imply small degrees of deviation from an ideal square-pyramidal geometry, whereas values approaching 1 signal significant distortions toward a trigonal bipyramidal geometry: Addison, A. W.; Rao, T. N.; Reedijk, J.; van Rijn, J.; Verschoor, G. C. J. Chem. Soc., Dalton Trans. 1984, 1349.
  • 71
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    • For omer examples of Ni-alkyl complexes diat are resistant to β-H elimination see:(a) Liang, L.-C.; Lin, J.-M.; Hung, C.-H. Organometallics 2003, 22, 3007.
    • For omer examples of Ni-alkyl complexes diat are resistant to β-H elimination see:(a) Liang, L.-C.; Lin, J.-M.; Hung, C.-H. Organometallics 2003, 22, 3007.
  • 74
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    • The yield of ligand remains unchanged whether the synthesis is done under an argon or nitrogen atmosphere
    • The yield of ligand remains unchanged whether the synthesis is done under an argon or nitrogen atmosphere.
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* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.