Field-induced slow relaxation of magnetization in dinuclear and trinuclear Co-III ... Mn-III complexes

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33161064" target="_blank" >RIV/61989592:15310/16:33161064 - isvavai.cz</a>

Result on the web

<a href="http://pubs.rsc.org/en/content/articlehtml/2016/ra/c5ra23922b" target="_blank" >http://pubs.rsc.org/en/content/articlehtml/2016/ra/c5ra23922b</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c5ra23922b" target="_blank" >10.1039/c5ra23922b</a>

Result language

angličtina

Original language name

Field-induced slow relaxation of magnetization in dinuclear and trinuclear Co-III ... Mn-III complexes

Original language description

Two new dinuclear, [Co(3EtO-L5)(mu-CN) Mn(L4a) Cl] (1) and [Co(3EtO-L5)(mu-CN) Mn(L4a) Br] (2), and two trinuclear [{Co(3EtO-L5)(mu-CN)}(2)Mn(L4a)]I (3) and [{Co(3EtO-L5)(mu-CN)}(2)Mn(L4a)](NO3) (4) complexes were prepared and thoroughly characterized (H(2)3EtO-L5 N, N'-bis(3-ethoxy-2-hydroxybenzylidene)-1,6- diamino-3-azahexane, L4a(2-) = N, N'-ethane-bis(salicylideneiminate) dianion). The crystal structures were determined for all four compounds, while the static and dynamic magnetic properties were studied only for compounds 1-3. It has been revealed by simultaneous fitting of temperature and field dependent magnetic data and by using the spin Hamiltonian formalism involving the axial anisotropy term that the manganese(III) atoms possess relatively large and negative axial magnetic anisotropy in 1-3, with D = -3.9(2) cm(-1) in 1, -4.9(2) cm(-1) in 2, and -4.1(1) cm(-1) in 3. These results were supported by ab initio CASSCF calculations which were in good agreement with the experimental ones, however, a small rhombicity was calculated contrary to the experimental evaluations: D-calc(E-calc/D-calc) = -3.2 cm(-1) (0.04) in 1, -3.0 cm(-1) (0.03) in 2, and -3.6 cm(-1) (0.04) in 3. The measurements of dynamic magnetic data confirmed that compounds 1-3 represent a new type of Mn(III) field-induced single-ion magnet. The peak maxima of the frequency dependent out-phase susceptibility were below the lowest accessible temperature in all the three cases (i. e. below 1.9 K) and this prevented us from the construction of the Argand diagram. Nevertheless, the approximate procedure for extracting the spin-reversal barrier (U-eff) and relaxation time (tau(0)) was used, and the values of U-eff ranging from 11 to 20 K and t(0) from 0.1 to 19 x 10(-7) s were obtained.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

CA - Inorganic chemistry

OECD FORD branch

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Project

<a href="/en/project/LO1305" target="_blank" >LO1305: Development of the center of advanced technologies and materials</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2016

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

RSC Advances (online)

ISSN

2046-2069

e-ISSN

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Volume of the periodical

6

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

10

Pages from-to

3074-3083

UT code for WoS article

000368193500065

EID of the result in the Scopus database

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