Towards a model for the oxidized form of purple acid phosphatase:
crystal structure and magnetic properties of a binuclear
iron(III) complex containing phosphate
ligands
Abstract
A novel binuclear iron(III) complex
[{FeL[O
2
P(OPh)
2
]}
2
][ClO
4
]
2
was synthesized and characterized by X-ray
single-crystal structure analysis, where HL is
bis(benzimidazol-2-ylmethyl)(2-hydroxyethyl)amine. The crystals are
triclinic, space group P![[1 with combining macron]](https://www.rsc.org/images/entities/char_0031_0304.gif)
, with
a = 11.523(9),
b = 11.809(6),
c = 13.406(4) Å,
α = 68.52(4), β = 71.41(5),
γ = 71.85(6)° and Z = 1.
The structure shows that the iron(III) ions are bridged by
the oxygen atoms of two L ligands and a phosphate ligand is terminally
co-ordinated to each iron(III). Magnetic susceptibility
measurements in the range 4.2–300 K and subsequent calculations
based on an isotropic Heisenberg model suggest antiferromagnetic
coupling between the iron(III) ions with
J = -17.5 cm
-1
.
, with
a = 11.523(9),
b = 11.809(6),
c = 13.406(4) Å,
α = 68.52(4), β = 71.41(5),
γ = 71.85(6)° and Z = 1.
The structure shows that the iron(III) ions are bridged by
the oxygen atoms of two L ligands and a phosphate ligand is terminally
co-ordinated to each iron(III). Magnetic susceptibility
measurements in the range 4.2–300 K and subsequent calculations
based on an isotropic Heisenberg model suggest antiferromagnetic
coupling between the iron(III) ions with
J = -17.5 cm
-1
.
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