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Volumn 27, Issue 13, 2008, Pages 2959-2970

Preparation and reactions of base-free bis(1,3-di-tert- butylcyclopentadienyl)titanium, Cp′2Ti, and related compounds

Author keywords

[No Author keywords available]

Indexed keywords

METALLOCENE;

EID: 47949106107     PISSN: 02767333     EISSN: None     Source Type: Journal    
DOI: 10.1021/om7012315     Document Type: Article
Times cited : (46)

References (66)
  • 13
  • 22
    • 36849043779 scopus 로고    scopus 로고
    • We encountered similar problems with Cp′2V. However, crystals of Cp′2Cr gave an excellent data set and a good X-ray structure. The Cp′2Cr and Cp′2 Fe crystallize in an orthorhombic crystal lattice, whereas Cp′2Ti and Cp′2V crystallize in a tetragonal lattice: Cp′ 2Ti: a, 12.0614(11) Å, b, 12.0614(11) Å, c =8.5317(11) Å, α, β= γ, 90°; Cp′2V: a, 11.9810(11) Å, b, 11.9810(11) Å, c, 8.6312(11) Å, α, β, γ, 90°; Cp′2Cr: a, 11.7750(6) Å, b, 12.4122(6) Å, c, 32.6410(20) Å, α, β, γ, 90°, Pccn: Schultz, M. Acta Crystallogr. 2007, E63, m3085
    • 2Cr: a = 11.7750(6) Å, b = 12.4122(6) Å, c = 32.6410(20) Å, α. = β = γ = 90°, Pccn: Schultz, M. Acta Crystallogr. 2007, E63, m3085.
  • 23
    • 0011593421 scopus 로고    scopus 로고
    • 2Fe: a = 11.561(2) Å, b= 12.113(2) Å, c =33.437(6) Å, α = β = γ = 90°, Pccn: Boese, R.; Blaeser, D.; Kuhn, N. Z. Kristallogr. 1993, 205, 282-284.
    • 2Fe: a = 11.561(2) Å, b= 12.113(2) Å, c =33.437(6) Å, α = β = γ = 90°, Pccn: Boese, R.; Blaeser, D.; Kuhn, N. Z. Kristallogr. 1993, 205, 282-284.
  • 25
    • 47949104141 scopus 로고    scopus 로고
    • The moment might be low due to the extreme sensitivity of the base-free titanocene to trace amounts of N2 in argon even in the solid state. This is particularly true for those samples that are finely ground, i.e, those used for the magnetic susceptibility measurements
    • 2 in argon even in the solid state. This is particularly true for those samples that are finely ground, i.e., those used for the magnetic susceptibility measurements.
  • 26
    • 0000268787 scopus 로고    scopus 로고
    • B is determined in the solid state.
    • B is determined in the solid state.
  • 36
    • 0000070293 scopus 로고
    • Magnetochemistry-Advances in Theory and Experimentation
    • Lippard, S. J, Ed, J. Wiley & Sons: New York
    • O'Connor, C. J., Magnetochemistry-Advances in Theory and Experimentation. In Progress in Inorganic Chemistry; Lippard, S. J., Ed.; J. Wiley & Sons: New York, 1982; Vol. 29, pp 203-285.
    • (1982) Progress in Inorganic Chemistry , vol.29 , pp. 203-285
    • O'Connor, C.J.1
  • 39
    • 47949085695 scopus 로고    scopus 로고
    • A referee suggested that the resonance at δ 2.65 may be assigned to the D2h conformer and the one at δ 5.3 to the D2d conformer, since the ratio irreversibly changes toward the δ 5.3 resonance, which is the least sterically congested conformer. Over time, the resonance at δ 2.65 evolved into two resonances, which might be due to various Cp″ ring conformations within the D2h. conformation. While we agree with the general postulate that isomers are present see the next paragraph, we can provide no experimental evidence for the specific assignment. The solid state magnetic measurements might be useful, but they were obtained only to temperatures of 300 K; on cooling from 300 to 5 K, no obvious deviation from the original Χ vs T plots were evident to the eye. We thank a referee for this suggestion
    • 2h. conformation. While we agree with the general postulate that isomers are present (see the next paragraph), we can provide no experimental evidence for the specific assignment. The solid state magnetic measurements might be useful, but they were obtained only to temperatures of 300 K; on cooling from 300 to 5 K, no obvious deviation from the original Χ vs T plots were evident to the eye. We thank a referee for this suggestion.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.