X- and Q-band EPR on 57Fe-enriched [(C6H5)4As]2[FeI(NO)(mnt)2]

Teschmit, Grit; Kirmse, R.

doi:10.1016/s1387-7003(99)00115-x

Cited by 5 publications

(4 citation statements)

References 17 publications

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“…The spectra closely resemble those reported for other five- and six-coordinated {FeNO} 7 ( S = 1/2) species. , From DFT calculations 16 it has been concluded that these complexes should be described as low-spin Fe(II) coordinated to a neutral NO • radical. The spectrum of [ 5a ] 2- has been reported and interpreted previously 10 X-Band EPR spectrum of [ 2a ] 2- in frozen CH 2 Cl 2 at 30 K. Conditions: ν = 9.43 GHz, power 1.0 × 10 -5 mW; modulation 7.0 G. For simulation parameters, see Table . …”

Section: Resultsmentioning

confidence: 95%

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)₂]^z(z= 1+, 0, 1−, 2−)

et al. 2006

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Four members of the electron-transfer series [Fe(NO)(S(2)C(2)R(2))2]z (z = 1+, 0, 1-, 2-) have been isolated as solid materials (R = p-tolyl): [1a](BF4), [1a]0, [Co(Cp)2][1a], and [Co(Cp)2]2[1a]. In addition, complexes [2a]0 (R = 4,4-diphenyl), [3a]0 (R = p-methoxyphenyl), [Et(4)N][4a] (R = phenyl), and [PPh(4)][5a] (R = -CN) have been synthesized and the members of each of their electron-transfer series electrochemically generated in CH(2)Cl(2) solution. All species have been characterized electro- and magnetochemically. Their electronic, Mössbauer, and electron paramagnetic resonance spectra as well as their infrared spectra have been recorded in order to elucidate the electronic structure of each member of the electron-transfer series. It is shown that the monocationic, neutral, and monoanionic species possess an {FeNO}6 (S = 0) moiety where the redox chemistry is sulfur ligand-based, (L)2-(L*)1-: [Fe(NO)(L*)2]+ (S = 0), [Fe(NO)(L*)(L)]0 <--> [Fe(NO)(L)(L*)]0 (S = 1/2), [Fe(NO)(L)2]- (S = 0). Further one-electron reduction generates a dianion with an {FeNO}7 (S = 1/2) unit and two fully reduced, diamagnetic dianions L2-: [Fe(NO)(L)2]2- (S = 1/2).

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Section: Resultsmentioning

confidence: 95%

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)₂]^z(z= 1+, 0, 1−, 2−)

et al. 2006

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“…Magnetic susceptibility and Mössbauer measurements on [Fe(NO)(salen)] 2+ have detected transitions between the S = 3/2 and S = 1/2 spin states . In contrast to this behavior, the isoelectronic five-coordinate iron(I) complexes Fe(NO)(E 2 CNR 2 ) 2 (E = S, Se) and [Fe(NO)(S 2 CC(CN) 2 ) 2 ] 2- have been found to be pure low-spin species by ESR spectroscopic and magnetic susceptibility methods. − Kirmse and co-workers have utilized isotopic labeling techniques to prove that trace amounts of Fe(NO)(S 2 CNEt 2 ) 2 are responsible for a previously ill-explained triplet at g = 2.0 in the ESR spectrum of Fe(S 2 CNEt 2 ) 3 . The nitrosyl-containing impurity is present as a result of traces of nitrate ions in the FeCl 3 starting materials .…”

Section: Group 8 Nitrosylsmentioning

confidence: 99%

Coordination and Organometallic Chemistry of Metal−NO Complexes

2002

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“…A super hyperfine interaction based on the low abundance of the naturally occurring 13 C nuclei in the paramagnetic ion, Mo(CN) 8 ] 3− is known. [21][22][23] Reaction of complex 1 with acids…”

Section: Resultsmentioning

confidence: 99%

Super reduced Fe4S4 cluster of Balch's dithiolene series

et al. 2012

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A super reduced Fe(4)S(4) cluster with a sulfur based radical, [NBu(4)](4)[Fe(3)(III)Fe(II)(μ(3)-S)(4)(mnt)(3)(6-)(mnt)(1-)˙](4-)˙, (1) (mnt, maleonitrile dithiolate) which evolves H(2)S gas on treatment with acid under ambient conditions has been synthesized and structurally characterized. The Fe-S distances in 1 are in the range 2.246-2.383 Å, in stark contrast to that of the known n = -2 member of the series based on the [Fe(4)(μ(3)-S)(4)(S(2)C(2)R(2))(4)](n) unit (R = CF(3), Ph) with Fe-S bond lengths of 2.149-2.186 Å. The EPR of 1 displays very weak signals at g, 4.03 and 2.38 along with a strong S-based radical EPR signal at g, 2.003 associated with five structured components tentatively assigned to hyperfine interaction arising out of the naturally abundant (57)Fe with = 88 G. The EPR profile resembles the reduced Fe-S cluster of CO inhibited Clostridium pasteurianum W5 hydrogenase or the Fe(4)S(4) centers of wild-type enzyme, IspH treated with HMBPP or IPP.

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X- and Q-band EPR on 57Fe-enriched [(C6H5)4As]2[FeI(NO)(mnt)2]

Cited by 5 publications

References 17 publications

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)₂]^z(z= 1+, 0, 1−, 2−)

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)₂]^z(z= 1+, 0, 1−, 2−)

Coordination and Organometallic Chemistry of Metal−NO Complexes

Super reduced Fe4S4 cluster of Balch's dithiolene series

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X- and Q-band EPR on 57Fe-enriched [(C6H5)4As]2[FeI(NO)(mnt)2]

Cited by 5 publications

References 17 publications

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)2]z(z= 1+, 0, 1−, 2−)

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)2]z(z= 1+, 0, 1−, 2−)

Coordination and Organometallic Chemistry of Metal−NO Complexes

Super reduced Fe4S4 cluster of Balch's dithiolene series

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Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)₂]^z(z= 1+, 0, 1−, 2−)

Electronic Structure of Nitric Oxide Adducts of Bis(diaryl-1,2-dithiolene)iron Compounds: Four-Membered Electron-Transfer Series [Fe(NO)(L)₂]^z(z= 1+, 0, 1−, 2−)