Axial ligand substituted nonheme FeIV=O complexes: observation of near-UV LMCT bands and Fe=O Raman vibrations.

نویسندگان

  • Chivukula V Sastri
  • Mi Joo Park
  • Takehiro Ohta
  • Timothy A Jackson
  • Audria Stubna
  • Mi Sook Seo
  • Jimin Lee
  • Jinheung Kim
  • Teizo Kitagawa
  • Eckard Münck
  • Lawrence Que
  • Wonwoo Nam
چکیده

Axial ligand substitution of a mononuclear nonheme oxoiron(IV) complex, [FeIV(O)(TMC)(NCCH3)]2+ (1) (TMC = 1,4,8,11-tetramethyl-1,4,8,11-tetraazacyclotetradecane), leads to the formation of new FeIV=O species with relatively intense electronic absorption features in the near-UV region. The presence of these near-UV features allowed us to make the first observation of Fe=O vibrations of S = 1 mononuclear nonheme oxoiron(IV) complexes by resonance Raman spectroscopy. We have also demonstrated that the reactivity of nonheme oxoiron(IV) intermediates is markedly influenced by the axial ligands.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Resonance Raman Spectroscopic Evidence for the Identity of the Bacteriochlorophyll c Organization in Protein-Free and Protein-Containing Chlorosomes from Chloroflexus auvantiacus*

Protein-free and protein-containing chlorosomes from Chloroflexus aurantiacus, strain 0k -70fl, were studied by resonance Raman (RR) spectroscopy. Both preparations gave the same spectra o f the bacteriochlorophyll c (BChl c) chromophores in the range o f 12001750 cm “1. This strongly corroborates previous evidence [Griebenow et al., Z. Naturforsch. 45c, 823 -828 (1990), and references therein]...

متن کامل

Synthesis, Spectroscopy and Magnetism of Alkoxobridged Dinuclear Copper(II) Complexes with 2  Amino  Picolines as the Ligands

The synthesis, spectroscopic and magnetic characterization of a series of new alkoxo-bridged binuclear copper (II) compounds are described. All complexes have the general formula [Cu (m-OR)(L)2]2(ClO4)2 · x H2O, in which m-OR = CH3O-, C2H5O- or C3H7O-<e...

متن کامل

Axial Coordination of Pseudohalides Modulates the Physical Properties of a Non-Heme Fe=O Unit

High valent non-heme iron-oxygen species, such as Fe=O adducts, have been proposed as key intermediates for numerous non-heme iron enzymes. However, only one such Fe=O adduct has been detected in an enzyme system. In contrast, synthetic complexes containing non-heme Fe=O units have been generated using a variety of supporting ligands, and these studies have already demonstrated that the coordin...

متن کامل

An FeIV=O complex of a tetradentate tripodal nonheme ligand.

The reaction of [Fe(II)(tris(2-pyridylmethyl)amine, TPA)(NCCH(3))(2)](2+) with 1 equiv. peracetic acid in CH(3)CN at -40 degrees C results in the nearly quantitative formation of a pale green intermediate with lambda(max) at 724 nm ( epsilon approximately 300 M(-1).cm(-1)) formulated as [Fe(IV)(O)(TPA)](2+) by a combination of spectroscopic techniques. Its electrospray mass spectrum shows a pro...

متن کامل

Electronic Spectra and Photochemistry of Tin(II), Lead(II), Antimony(III), and Bismuth(III) Bromide Complexes in Solution

The electronic spectra o f bromo complexes o f main group metal ions with an s2 electronic configuration (SnBr3~, PbBr3~, PbBr42_, SbBr4~, SbBr63~, BiBr4~, BiBr63~) in acetonitrile show long-wavelength absorption bands which are assigned to metal-centered sp transitions. Com­ pared to the corresponding chloro complexes the sp bands o f the bromo complexes appear at longer wavelength due to sp/L...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:
  • Journal of the American Chemical Society

دوره 127 36  شماره 

صفحات  -

تاریخ انتشار 2005