In:
Journal of Applied Physics, AIP Publishing, Vol. 67, No. 9 ( 1990-05-01), p. 5861-5861
Abstract:
A sulfur-bridged iron dimeric compound of potassium bis(dithiooxalato)nitrosyliron monohydrate, K2Fe(C2O2S2)2NO⋅H2O, crystallized in the monoclinic space group C2/c with unit-cell dimensions of a=18.416(6) Å, b=15.800(6) Å, c=9.834(4) Å, and β=111.26(3)° with z=8. The coordination around the iron atom is distorted tetragonal pyramidal with an average basal Fe-S distance of 2.27 Å. The sixth coordination position of iron is filled by a sulfur atom from an adjacent complex ion with an Fe-S distance of 3.823 Å. The Fe-N-O fragment has an angle of 161.8(3)°, and the N-O distance is 1.148(3) Å. The loosely bound dimer exhibits surprisingly strong intramolecular anitferromagnetic interactions with the coupling constant J=−23.8 cm−1. This antiferromagnetic exchange occurs through an unsymmetrical unit with two short Fe-S distances and two rather long Fe-S distances. From the extended Hückel calculation of a monomer fragment, the relatively large superexchange interaction results from the effective overlap of iron 3dz2 and 4pz orbitals with the orbital of the bridging sulfur atom.
Type of Medium:
Online Resource
ISSN:
0021-8979
,
1089-7550
Language:
English
Publisher:
AIP Publishing
Publication Date:
1990
detail.hit.zdb_id:
220641-9
detail.hit.zdb_id:
3112-4
detail.hit.zdb_id:
1476463-5
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