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Keywords = cymantrenecarboxylate

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19 pages, 4761 KB  
Article
Mononuclear Transition Metal Cymantrenecarboxylates as Precursors for Spinel-Type Manganites
by Pavel S. Koroteev, Andrey B. Ilyukhin, Andrey V. Gavrikov, Konstantin A. Babeshkin and Nikolay N. Efimov
Molecules 2022, 27(3), 1082; https://doi.org/10.3390/molecules27031082 - 6 Feb 2022
Cited by 5 | Viewed by 5222
Abstract
Novel mononuclear cymantrenecarboxylate complexes of transition metals, [Co(H2O)6](CymCO2)2·4H2O (Cym = (η5-C5H4)Mn(CO)3) (1), [Ni(H2O)6](CymCO2)2·4H2O [...] Read more.
Novel mononuclear cymantrenecarboxylate complexes of transition metals, [Co(H2O)6](CymCO2)2·4H2O (Cym = (η5-C5H4)Mn(CO)3) (1), [Ni(H2O)6](CymCO2)2·4H2O (2), [Zn(H2O)6](CymCO2)2·4H2O (3), [Co(CymCO2)2(imz)2] (imz = imidazole, 4), [Co(CymCO2)2(bpy)2]·2PhMe (bpy = 2,2′-bipyridyl, 5), [Ni(CymCO2)(bpy)2(H2O)][CymCO2]·0.5MePh·2H2O (6), [Cu(CymCO2)2(imz)2] (7), and [Cu(CymCO2)2(bpy)(H2O)] (8), were obtained and characterized by single-crystal X-ray analysis. Complexes 1–3 are isostructural. Magnetism of the Co complexes 1, 4, and 5 was studied; it was shown that they exhibit the properties of field-induced single-molecule magnets with magnetization reversal barriers (ΔE/kB) of 44, 13, and 10 K, respectively. Thermal decomposition of complexes 1–8 was studied by means of DSC and TGA methods. The final products of thermolysis of 1–6 in air, according to powder XRD data, are the pure spinel phases MMn2O4; for the cases of copper complexes, the mixtures of CuMn2O4 and CuO were found in the products. Full article
(This article belongs to the Special Issue Metal-Organic Complexes: Applications in Chemistry and Materials Science)
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15 pages, 4108 KB  
Article
Magnetic Behavior of Carboxylate and β-Diketonate Lanthanide Complexes Containing Stable Organometallic Moieties in the Core-Forming Ligand
by Nikolay N. Efimov, Pavel S. Koroteev, Andrey V. Gavrikov, Andrey B. Ilyukhin, Zhanna V. Dobrokhotova and Vladimir M. Novotortsev
Magnetochemistry 2016, 2(4), 38; https://doi.org/10.3390/magnetochemistry2040038 - 10 Oct 2016
Cited by 23 | Viewed by 7965
Abstract
Information concerning the structures of compounds of rare earth elements with carboxylic acids and a β-diketone containing stable organometallic moieties that we obtained previously is presented. Additional results for 15 complexes with the [Gd2O2] core allowed confirming and improving [...] Read more.
Information concerning the structures of compounds of rare earth elements with carboxylic acids and a β-diketone containing stable organometallic moieties that we obtained previously is presented. Additional results for 15 complexes with the [Gd2O2] core allowed confirming and improving the correlation between JGd–Gd′ and the Gd…Gd distance for complexes of this type that we found earlier. For the first time, dc and ac magnetic measurements were carried out for the formerly-described complex [Dy2(O2CCym)4(NO3)2(DMSO)4] (2), Cym = (η5-C5H4)Mn(CO)3), and two new binuclear complexes, namely [Dy2(O2CFc)4(NO3)2(DMSO)4] (3), and [Dy2(O2CFc)6(DMSO)2(H2O)2] (4), Fc = (η5-C5H4)Fe(η5-C5H5)). For binuclear [Dy2(O2CCym)6(DMSO)4] (1), as well as for a 1D-polymer [Dy(O2CCym)(acac)2(H2O)]n (6), ac magnetic measurements were carried out more precisely. The characteristics of a single-molecule magnet and of a single-chain magnet were determined for Complexes 2 and 6, respectively. Full article
(This article belongs to the Special Issue Molecules in Quantum Information)
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