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Magnetyczne oddziaływania nadwymienne przez wiązania wodorowe=Magnetic interactions through hydrogen bonds.
Autorzy
Rok wydania
2008
Czasopismo
Numer woluminu
62
Strony
449-478
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Hydrogen bonds play a key role in interactions in biological structures, supra-molecular chemistry, and crystal engineering [28, 29]. The development of supramo-lecular structure created by hydrogen bonds is a new challenge for the synthesis ofmaterials, in order to study their magnetic behaviour [59, 62]. A role played byhydrogen bonds in the transmission of magnetic interactions is still not fully under-stood, but the number of magnetically coupled hydrogen-bonded systems is gro-wing.The present paper describes magnetic properties of copper(II) complexes [33]with nitrobenzoate and salicylate ligands where the system of hydrogen bondsO–H···O is the only path of magnetic interaction. Magnetic measurements in thetemperature range 1.8–300 K show magnetic phase-transition at 6 K to antiferromag-netically coupled CuII dimers with singlet-tryplet energy gap 2J = –6.26 cm–1.A variety of different supramolecular hydrogen bond structures [27, 33–52,57–62] and significant changes in their magnetic properties were analyzed to showthe role of hydrogen bonds in magnetic interactions. Magnetostructural correlationhas been made taking into account both covalently bridging ligand and the existenceof intermolecular hydrogen bonds. An evidence for hydrogen-bond-mediated exchangecoupling has been observed in magnetic study as well as in DFT calculations [40, 48].Intermolecular interaction has been generally treated as a nuance, but today,it has established itself as an important functional tool, tunable at will [59] in thedesign of nanosized magnetic materials and their dimensionally-expanded com-pounds [57–62]. Intermolecular magnetic exchange interactions through hydrogenbonds, can have a large influence on the quantum properties of single molecularmagnets SMMs [59]. Hydrogen bonding leads to coupling of the magnetic effects ofindividual SMMs units and to different quantum behaviour. Even very weak hydro-gen bond inter-molecular interactions demonstrate a possibility of switching froman original nanosized magnetic system to a correlated system, for example, fromsingle molecule magnet SMM to single chain magnet SCM or from such nanosizedmagnets to a bulk magnet [59].
Słowa kluczowe
copper(II) complexes, intermolecular magnetic exchange interactions, hydrogen bonds, nanosized magnetic materials
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Adres publiczny
https://www.dbc.wroc.pl/dlibra/publication/2554/edition/2574/content
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