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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 27, Number 8
BKCSDE 27(8)
August 20, 2006 

Structure and Properties of a Nonheme Pentacoordinate Iron(II) Complex with a Macrocyclic Triazapyridinophane Ligand
Minyoung You, Mi Sook Seo, Kwan Mook Kim, Wonwoo Nam*, Jinheung Kim*
Mononuclear iron(II) complex, Macrocyclic ligand, Nonheme, Catalytic oxidation
A macrocyclic ligand, N,N',N''-tribenzyl-2,11,20-triaza[3,3,3](2,6)pyridinophane (BAPP), was used to prepare an iron(II) complex as a nonheme model complex, [(BAPP)Fe]+2 (1). X-ray crystallography of a colorless crystal of 1 revealed that BAPP acted as a pentadentate ligand due to geometrical strain for the formation of a six-coordinate iron(II) complex by BAPP. As a result, the iron center revealed a significantly distorted square pyramidal geometry similar to that found in the active site of taurine dioxygenase (tauD). In the reaction of 1 with PhIO, no intermediate was observed in the UV-visible region of spectrometer at low temperatures. Catalytic oxidations of triphenyl phosphine with PhIO at -40 oC revealed that 1 was able to convert triphenyl phosphine to triphenyl phosphine oxide. Thioanisole was also oxidized to the corresponding methylphenyl sulfoxide under the same conditions.
1140 - 1144
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