Bridged ferrocenes. 10. Structural phenomena

Manny Hillman, Etsuko Fujita, Helen Dauplaise, Åke Kvick, Robert C. Kerber

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

The structures of 1,1′,2,2′-bis(tetramethylene)ferrocene, I, 1,1′,2,2′,4,4′-tris(tetramethylene)ferrocene, II, and 1,1′,2,2′,4,4′-tris(pentamethylene)ferrocene, III, are given and are compared to the previously determined2 structure of 1,1′,2,2′,4,4′-tris(trimethylene)ferrocene, IV. The iron-to-ring distances are consistent with the reported Mössbauer spectra3 and redox potentials.4 The cyclopentadienyl rings are eclipsed in the compounds with trimethylene and pentamethylene bridges but are staggered by 12-14° in the compounds with tetramethylene bridges. In compounds with tetra- and pentamethylene bridges the presence of staggering or eclipsing is attributed to the need to avoid eclipsing of the protons in the bridges. In the compound with three trimethylene bridges, the shortness of the bridges is of primary importance. The staggered conformation observed in I and II may be the source of the apparent anomalies observed in the ring-proton region of the NMR spectra of bridged ferrocenes. The bridge-proton region of the NMR spectra at 360 MHz are given for I and other bridged ferrocenes. Disorder of the bridge carbons observed in the crystals are correlated with the flipping of the bridges observed in the NMR spectra.

Original languageEnglish
Pages (from-to)1170-1177
Number of pages8
JournalOrganometallics
Volume3
Issue number8
Publication statusPublished - 1984

Fingerprint

ferrocenes
Protons
Nuclear magnetic resonance
nuclear magnetic resonance
protons
rings
staggering
Conformations
Carbon
Iron
disorders
anomalies
iron

ASJC Scopus subject areas

  • Inorganic Chemistry
  • Organic Chemistry

Cite this

Hillman, M., Fujita, E., Dauplaise, H., Kvick, Å., & Kerber, R. C. (1984). Bridged ferrocenes. 10. Structural phenomena. Organometallics, 3(8), 1170-1177.

Bridged ferrocenes. 10. Structural phenomena. / Hillman, Manny; Fujita, Etsuko; Dauplaise, Helen; Kvick, Åke; Kerber, Robert C.

In: Organometallics, Vol. 3, No. 8, 1984, p. 1170-1177.

Research output: Contribution to journalArticle

Hillman, M, Fujita, E, Dauplaise, H, Kvick, Å & Kerber, RC 1984, 'Bridged ferrocenes. 10. Structural phenomena', Organometallics, vol. 3, no. 8, pp. 1170-1177.
Hillman M, Fujita E, Dauplaise H, Kvick Å, Kerber RC. Bridged ferrocenes. 10. Structural phenomena. Organometallics. 1984;3(8):1170-1177.
Hillman, Manny ; Fujita, Etsuko ; Dauplaise, Helen ; Kvick, Åke ; Kerber, Robert C. / Bridged ferrocenes. 10. Structural phenomena. In: Organometallics. 1984 ; Vol. 3, No. 8. pp. 1170-1177.
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