Iron

Ward, Michael D.

doi:10.1016/0010-8545(92)80037-r

Cited by 4 publications

(1 citation statement)

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“…Coordination by the carboxyl group is a pervasive feature of iron(III) chemistry and biochemistry. − But for one exception, systems incorporating such binding are universally high-spin ( s = 5 / 2 per iron(III)). Species of the low-spin ( s = 1 / 2 ) category remain a synthetic and structural curiosity, and the prospect of realizing them aroused our interest.…”

Section: Introductionmentioning

confidence: 99%

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN₄O₂

Karmakar

Chakravorty

1996

Inorg. Chem.

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Three tridentate ligands H2PhL (Ar = Ph), H2ToL (Ar = p-tolyl), and H2NpL (Ar = α-naphthyl) of structural type HONC(Ar)NNC6H4CO2H have been synthesized. These (general abbreviation H2ArL) react with iron(III) chloride, affording the pink Et4N[Fe(ArL)2] (s = 1/2; μeff = 1.98−2.04 μB) in which azo oxime chelation ensures spin-pairing while carboxylate coordination stabilizes the trivalent state. The EPR spectra of the complexes in frozen dimethylformamide−toluene glass (77 K) are rhombic with g values in the range 1.997−2.173. The X-ray structure of Et4N[Fe(NpL)2]·H2O·CH2Cl2 has been determined, revealing meridional binding of the two ligands affording cis-FeN4O2 geometry. The effect of spin-pairing is expressed in the relatively short (∼1.90 Å) Fe−O and Fe−N lengths. The water of crystallization is hydrogen-bonded to carboxyl O atoms. The iron(III)−iron(II) reduction potentials lie near −0.1 V vs SCE. Crystal data for Et4N[Fe(NpL)2]·H2O·CH2Cl2: crystal system triclinic, space group P1̄, a = 11.539(9) Å, b = 13.306(13) Å, c = 14.60(2) Å, α = 89.30(9)°, β = 82.65(9)°, γ = 79.90(8)°, V = 2189(4) Å3, Z = 2, R = 6.59%, R w = 6.23%.

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Section: Introductionmentioning

confidence: 99%

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN₄O₂

Karmakar

Chakravorty

1996

Inorg. Chem.

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ChemInform Abstract: Iron

Ward

1992

ChemInform

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Interplay between iron complexes, nitric oxide and sulfur ligands: Structure, (photo)reactivity and biological importance

Szaciłowski

Chmura

Stasicka

2005

Coordination Chemistry Reviews

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Iron

Cited by 4 publications

References 493 publications

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN₄O₂

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN₄O₂

ChemInform Abstract: Iron

Interplay between iron complexes, nitric oxide and sulfur ligands: Structure, (photo)reactivity and biological importance

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Iron

Cited by 4 publications

References 493 publications

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN4O2

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN4O2

ChemInform Abstract: Iron

Interplay between iron complexes, nitric oxide and sulfur ligands: Structure, (photo)reactivity and biological importance

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Product

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Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN₄O₂

Carboxyl-Bonded Low-Spin Iron(III). Chemistry of a Family of Coordination Type cis-FeN₄O₂