ISSN:
1662-8985
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mononuclear FeII complex [FeII(ppba)]2+ (ppba = (6-pivalamido-2-pyridylmethyl)(2-pyridylmethyl)tert-butylamine) (1) has been synthesized and structurally characterized. Theaddition of H2O2 (10eq) to an acetone solution of 1 at -78°C generated FeIIIPPBA-OOH species,accompanied by a color change from pale yellow to reddish purple, which showed an intenseabsorption band corresponding to LMCT band (HOO- to Fe) at 528 nm (ε = 1120 M-1cm-1). The ESRspectrum for FeIIIPPBA-OOH species (g// = 4.22, g⊥ = 7.70 in acetone at 77 K) was typical of ahigh-spin FeIII species, suggesting that the FeIIIPPBA-OOH species is maintained as a mononuclearcomplex in the solution state. The resonance Raman spectra, when H216O2 and H218O2 were used,exhibited intense bands characteristic to the O-O stretching vibrations at 880 cm-1 ν(16O-16O) and 824cm-1 ν(18O-18O), respectively. These findings suggest that FeIIIPPBA-OOH species is[FeIII(ppba)(OOH)]2+ (2). In order to understand the catalytic reactivity of complex 2, oxidativereactions for some organic substrates by complex 2 were carried out in the presence of H2O2;thioanisole was oxidized to the corresponding sulfoxide and sulfone, respectively, and furthermore,cyclohexene was converted to cyclohexene oxide, cyclohexenol and cyclohexenone
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/39/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.11-12.331.pdf
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