Abstract
A synthesis of [10]paracyclophane (Pc) and its organometallic complexes, Pc·Cr(CO)3, [PcMn(CO)3]+BF4 −, (PcRuC5Me5)+·PF6 −, (PcRhC5Me5)2+(BF4 −)2, and PcCo4(CO)9 has been carried out. The1H NMR spectra of mononuclear complexes of neutral Cr and monocationic derivatives of Mn and Ru have been examined. η6-Coordination with a transition metal atom causes a decrease in the ring π-current which is exhibited as a downfield displacement of the resonance signals from the protons of the β-ε-CH2 groups in relation to those of free Pc. In the monocationic complexes the deshielding action of the positive charge is also added to this effect. In the1H NMR spectrum of the cluster PcCo4(CO)9 the resonance signals from the β-ε-CH2 protons are shifted upfield in relation to the Pc signals. Consequently, the concept of the ring π-current decrease needs more detailed investigation for cluster systems.
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Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 8, pp. 1467–1470, August, 1993.
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Kreindlin, A.Z., Kaganovich, V.S., Petrovsky, P.V. et al. On the decrease in the ring π-current upon η6-coordination with a transition metal atom. Russ Chem Bull 42, 1405–1408 (1993). https://doi.org/10.1007/BF00699942
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DOI: https://doi.org/10.1007/BF00699942