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Coordination compounds containing three different spin carriers (2p, 3d, and 4f), with the general formula [MDy(LH)(hfac)] (M = Co, Ni, Mn, Zn), have been obtained using Mannich ligands decorated with a nitronyl-nitroxide fragment. The synthetic approach is general and leads to binuclear 3d-4f complexes, the two metal ions being bridged by one aminoxyl group and by one oxygen atom arising from a hfac ligand. Triangular spin topology affords significant 2p-3d, 3d-4f, and 2p-4f exchange interactions. For the [CoDyRad] derivative obtained using a nitronyl-nitroxide chiral ligand, a high energy barrier (∼200 cm) and a slow relaxation behavior below 30 K were found and rationalized by calculations. The improvement of magnetic properties comes from the synergy of optimal single ions properties and exchange couplings contributions where the Co-Rad interaction becomes the leading one. The role played by this interaction is clearly proved by the investigation of the magnetic properties of the [ZnDyRad] derivative, with a much lower energy barrier (12.7 cm) and by the lack of SMM behavior of the previously reported [CoDyRad] compound ( . 2017 , 53 , 6504 ), with a linear topology of spin carriers and a negligible Co-Rad interaction.
This article was published in the following journal.
Name: Inorganic chemistry
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High molecular weight, insoluble polymers which contain functional groups that are capable of undergoing exchange reactions (ION EXCHANGE) with either cations or anions.
People who engage in occupational sexual behavior in exchange for economic rewards or other extrinsic considerations.
A condition occurring in the female offspring of dizygotic twins (TWIN, DIZYGOTIC) in a mixed-sex pregnancy, usually in CATTLE. Freemartinism can occur in other mammals. When placental fusion between the male and the female FETUSES permits the exchange of fetal cells and fetal hormones, TESTICULAR HORMONES from the male fetus can androgenize the female fetus producing a sterile XX/XY chimeric "female"(CHIMERISM).
Separation technique in which the stationary phase consists of ion exchange resins. The resins contain loosely held small ions that easily exchange places with other small ions of like charge present in solutions washed over the resins.
Any situation where an animal or human is trained to respond differentially to two stimuli (e.g., approach and avoidance) under reward and punishment conditions and subsequently trained under reversed reward values (i.e., the approach which was previously rewarded is punished and vice versa).