Cobalt Triflates [Co(H2O)6](CF3SO3)2 and Co(CF3SO3)2: Synthesis, Crystal Structures, Thermal Stability, and Magnetic Properties

被引：0

作者：

Karpova, E.V. ^{[1
]}

Ryabov, M.A. ^{[1
]}

Zakharov, M.A. ^{[1
]}

Alekseeva, A.M. ^{[1
]}

Mironov, A.V. ^{[1
]}

Kozlyakova, E.S. ^{[1
,2
]}

Korolev, V.V. ^{[2
]}

Morozov, I.V. ^{[1
,2
]}

机构：

[1] Moscow State University, Moscow, Russia

[2] Moscow State Institute of Steel and Alloys (National Research Technological University MISiS), Moscow, Russia

来源：

Russian Journal of Coordination Chemistry/Koordinatsionnaya Khimiya | 2022年 / 48卷 / 11期

基金：

俄罗斯基础研究基金会;

关键词：

Anhydrous salts - Argon flow - Cobalt atoms - Cobalt(II) triflate - Compound I - Crystals structures - IR-spectroscopy - Molecular magnet - Space Groups - Triflates;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

Abstract: Cobalt triflate hexahydrate [Co(H2O)6](CF3SO3)2 (I) is crystallized from aquos solution. The dehydration of salt I at 200°C in an argon flow affords anhydrous salt Co(CF3SO3)2 (II). The crystal structures of compounds I and II are determined from single crystal and powder X-ray diffraction data, respectively. Compound I is isostructural to [Ni(H2O)6](CF3SO3)2 and crystallizes in the space group (Formula presented.)m1, а = 7.3914(16), с = 8.704(2) Å, V = 411.8(2) Å3, Z = 1. The structure of compound II (space group (Formula presented.), а = 4.9996(1), с = 31.3137(8) Å, V = 677.86(3) Å3, Z = 3) belongs to the structural type M(CF3SO3)2, where M = Mg, Ca, and Zn. In the structures of both compounds, the cobalt atoms are in the octahedral environment of the oxygen atoms belonging to the water molecules (I) or triflate groups (II). In compound I, the [Co(H2O)6]2+ cations localized in the nodes of a regular triangular network are linked with the (CF3-SO3)– anions via hydrogen bonds to form layers parallel to the (001) plane. When compound I is dehydrated to form compound II, the [CoO6] octahedra are coupled via the μ3-CF3SO3 group with the retention of the layered structure. The synthesized compounds are characterized by IR spectroscopy, TG/DTA/MS. The results of studying the magnetic properties of compounds I and II indicate no magnetic ordering at low temperatures and correspond to the paramagnetic behavior of compounds I and II at high temperatures with a considerable contribution of the spin-orbital interaction to the effective magnetic moment of the cobalt atom. © 2022, Pleiades Publishing, Ltd.

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