Three complexes, [Mn(salphen)(H(2)O)](2)[Fe(CN)(5)(NO)] x 2 CH(3)OH (1) (salphen = N,N'-phenylenebis(salicylideneiminato) dianion), [Mn(naphtmen)(CH(3)OH)](2)[Fe(CN)(5)(NO)] (2) (naphtmen = N,N'-(1,1,2,2-tetramethylethylene)bis(naphthylideneiminato) dianion), and {[Mn(salen)](2)[Fe(CN)(5)(NO)] x H(2)O}(n) (3) (salen = N,N'-ethylene-bis(salicylideneiminato) dianion), were synthesized and structurally characterized by X-ray single-crystal diffraction. The structural analyses show that complexes 1 and 2 consist of the discrete linear trinuclear [Mn(SB)](2)[Fe(CN)(5)(NO)] units (SB = salphen for 1, naphtmen for 2); in complex 3, the nitroprusside anion coordinates to the axial sites of the four [Mn(salen)](+) entities through its four cyano nitrogen atoms, providing a two-dimensional network. The magnetic analysis indicates that the nitroprusside bridging ligand propagates a very weak antiferromagnetic exchange and single-ion anisotropy (D) plays an important role in the overall magnetic properties. Different from complexes 2 and 3, complex 1 shows a typical spin-flop transition with a critical field of 20 kOe.

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2010) Synthesis, crystal structure, spectroscopy, and magnetism of a mixed valence Co(III)-Co(II)-Co(III) complex stabilized by N-(2-hydroxybenzyl)salicylaldimine, Journal of Coordination Chemistry, 63:3, 505-514,Here, HL b is salicylaldimine, which is afforded by an in situ transformation of H 2 L a via cleavage of the C-N bond. Complex 1 has been characterized by X-ray crystallography as well as elemental analysis, UV-Vis, and IR spectroscopy. The cathodic and anodic responses of 1 in DMF appeared at À1.46 V (Co III ! Co II , quasi-irreversible) and þ0.99 V (Co II ! Co III , irreversible) versus saturated calomel electrode, respectively. The magnetic behavior of 1 has been analyzed by the one-ion approximation with spin-orbit coupling in O h symmetry giving ¼ À121 cm À1 .

Bimetallic oxalate {[N -(n-C4H9)4][FeFe(C2O4)3]}n has been investigated by the Mössbauer spectroscopy. The Mössbauer studies conrm that high-spin Fe(III) (S = 5/2) and Fe(II) (S = 2) ions are present in the compound. These spectra above 60 K consist of three quadrupole doublets, indicating that there are three dierent Fe sites in the material. The Mössbauer results reveal that spontaneous magnetization of Fe(II) sublattices increases more steeply than that of Fe(III) sublattices as the temperature decreases from TC. Great increase of quadrupole splitting at 50 K provides compelling evidence for the predicted JahnTeller transition.