In:
European Journal of Inorganic Chemistry, Wiley, Vol. 2019, No. 8 ( 2019-02-28), p. 1119-1127
Abstract:
Co(acac) 2 (H 2 O) 2 ( 1 , acac = acetylacetonate), a transition metal complex ( S = 3/2), displays field‐induced slow magnetic relaxation as a single‐molecule magnet. For 1 and its isotopologues Co(acac) 2 (D 2 O) 2 ( 1‐ d 4 ) and Co(acac‐ d 7 ) 2 (D 2 O) 2 ( 1‐ d 18 ) in approximately D 4 h symmetry, zero‐field splitting of the ground electronic state leads to two Kramers doublets (KDs): lower energy M S = ±1/2 ( ϕ 1,2 ) and higher energy M S = ±3/2 ( ϕ 3,4 ) states. This work employs inelastic neutron scattering (INS), a unique method to probe magnetic transitions, to probe different magnetic excitations in 1‐ d 4 and 1‐ d 18 . Direct‐geometry, time‐of‐flight Disk‐Chopper Spectrometer (DCS), with applied magnetic fields up to 10 T, has been used to study the intra‐KD transition as a result of Zeeman splitting, M S = –1/2 ( ϕ 1 ) → M S = +1/2 ( ϕ 2 ), in 1‐ d 18 . This is a rare study of the M S = –1/2 → M S = +1/2 excitation in transition metal complexes by INS. Indirect‐geometry INS spectrometer VISION has been used to probe the inter‐KD, ZFS transition, M S = ±1/2 ( ϕ 1,2 ) → M S = ±3/2 ( ϕ 3,4 ) in both 1‐ d 4 and 1‐ d 18 , by variable‐temperature (VT) properties of this excitation. The INS spectra measured on VISION also give phonon features of the complexes that are well described by periodic DFT phonon calculations.
Type of Medium:
Online Resource
ISSN:
1434-1948
,
1099-0682
DOI:
10.1002/ejic.v2019.8
DOI:
10.1002/ejic.201801088
Language:
English
Publisher:
Wiley
Publication Date:
2019
detail.hit.zdb_id:
1475009-0
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