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Modulated spin dynamics of [Co] coordination helicates differential strand composition
Ist Teil von
Dalton transactions : an international journal of inorganic chemistry, 2024-04, Vol.53 (17), p.7611-7618
Erscheinungsjahr
2024
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
Coordination supramolecular chemistry provides a versatile entry into materials with functionalities of technological relevance at the nanoscale. Here, we describe how two different bis-pyrazolylpyridine ligands (L1 and L2) assemble with Co(
ii
) ions into dinuclear triple-stranded helicates, in turn, encapsulating different anionic guests. These constructs are described as (Cl@[Co
2
(L1)
3
])
3+
, (SiF
6
@[Co
2
(L1)(L2)
3
])
2+
and (ClO
4
@[Co
2
(L2)
3
])
3+
, as established by single-crystal X-ray diffraction. Extensive magnetic and calorimetric measurements, numerical treatments and theoretical calculations reveal that the individual Co(
ii
) centers of these supramolecular entities exhibit field-induced slow relaxation of magnetization, dominated by direct and Raman mechanisms. While the small variations in the spin dynamics are not easily correlated with the evident structural differences among the three species, the specific heat measurements suggest two vibronic pathways of magnetic relaxation: one that would be associated with the host lattice and another linked with the guest.
A family of
bis
-pyrazolylpyridine ligands represents a versatile entry into [Co
2
] triple-stranded helicates encapsulating various anionic guests, enabling to study the effects of different factors on the mechanisms of magnetic relaxation of their individual Co(
ii
) centers.
Sprache
–
Identifikatoren
ISSN: 1477-9226
eISSN: 1477-9234
DOI: 10.1039/d4dt00629a
Titel-ID: cdi_rsc_primary_d4dt00629a
Format
–
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