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Magnetic relaxation in dysprosium and terbium 1D-zigzag coordination chains having only 4,4′-bipyridine as connector.

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Title: Magnetic relaxation in dysprosium and terbium 1D-zigzag coordination chains having only 4,4′-bipyridine as connector.
Authors: Bellucci, Luca1 (AUTHOR), Labella, Luca1 (AUTHOR) luca.labella@unipi.it, Marchetti, Fabio1 (AUTHOR), Pineider, Francesco1 (AUTHOR), Poneti, Giordano1,2 (AUTHOR) gponeti@iq.ufrj.br, Samaritani, Simona1 (AUTHOR)
Source: Inorganica Chimica Acta. Feb2021, Vol. 516, pN.PAG-N.PAG. 1p.
Subjects: Magnetic relaxation, Terbium, Dysprosium, Coordination polymers, Magnetic properties, Magnetic fields
Abstract: • High yield synthesis of lanthanide 1D-zigzag coordination polymers. • Zero field magnetization dynamics for the dysprosium derivative. • Two different relaxation processes for the dysprosium/yttrium system. • Each magnetic relaxation process compatible with a mixed Raman/Direct mechanism. The coordination chain {[Dy(dbm) 3 bpy]·C 7 H 8 } n (1) having only 4,4′-bipyridine as connector has been prepared in high yield and its structural and magnetic properties have been investigated. It is isostructural with the terbium analogue {[Tb(dbm) 3 bpy]·C 7 H 8 } n (2) and features units repeating in a 1D-zigzag fashion, where the metal is octa-coordinated in a distorted square antiprism geometry. Despite the 1D structure, the absence of paramagnetic connectors prevents the direct magnetic intrachain interaction among the lanthanide ions. In zero magnetic field, only a small fraction of the magnetization of 1 displayed slow dynamics with no dependence on temperature. Upon application of a 1 kOe magnetic field, a relaxation process appears, compatible with a mixed Raman/Direct mechanisms. Magnetic dilution in the diamagnetic Y(III)-based analogue revealed that actually two distinct relaxation processes are active for 1 , whose temperature dependence can be interpreted again with a mixed Raman/Direct relaxation model. Compound 2 displayed only in-field slow relaxation, compatible with the models employed for 1. [ABSTRACT FROM AUTHOR]
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Abstract:• High yield synthesis of lanthanide 1D-zigzag coordination polymers. • Zero field magnetization dynamics for the dysprosium derivative. • Two different relaxation processes for the dysprosium/yttrium system. • Each magnetic relaxation process compatible with a mixed Raman/Direct mechanism. The coordination chain {[Dy(dbm) 3 bpy]·C 7 H 8 } n (1) having only 4,4′-bipyridine as connector has been prepared in high yield and its structural and magnetic properties have been investigated. It is isostructural with the terbium analogue {[Tb(dbm) 3 bpy]·C 7 H 8 } n (2) and features units repeating in a 1D-zigzag fashion, where the metal is octa-coordinated in a distorted square antiprism geometry. Despite the 1D structure, the absence of paramagnetic connectors prevents the direct magnetic intrachain interaction among the lanthanide ions. In zero magnetic field, only a small fraction of the magnetization of 1 displayed slow dynamics with no dependence on temperature. Upon application of a 1 kOe magnetic field, a relaxation process appears, compatible with a mixed Raman/Direct mechanisms. Magnetic dilution in the diamagnetic Y(III)-based analogue revealed that actually two distinct relaxation processes are active for 1 , whose temperature dependence can be interpreted again with a mixed Raman/Direct relaxation model. Compound 2 displayed only in-field slow relaxation, compatible with the models employed for 1. [ABSTRACT FROM AUTHOR]
ISSN:00201693
DOI:10.1016/j.ica.2020.120165