Solvent-induced structural diversity in tetranuclear Ni(II) Schiff-base complexes: the first Ni-4 single-molecule magnet with a defective dicubane-like topology

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61989592%3A15310%2F16%3A33161112" target="_blank" >RIV/61989592:15310/16:33161112 - isvavai.cz</a>

Výsledek na webu

<a href="http://pubs.rsc.org/en/content/articlepdf/2016/dt/c6dt03520e" target="_blank" >http://pubs.rsc.org/en/content/articlepdf/2016/dt/c6dt03520e</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1039/c6dt03520e" target="_blank" >10.1039/c6dt03520e</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Solvent-induced structural diversity in tetranuclear Ni(II) Schiff-base complexes: the first Ni-4 single-molecule magnet with a defective dicubane-like topology

Popis výsledku v původním jazyce

Two tetranuclear Ni-II complexes, namely [Ni-4(L)(4)(CH(3)OH())3(H2O)]center dot CH3OH (1) and (Pr3NH)(2)[Ni-4(L)(4) (CH3COO)(2)] (2, Pr3N = tripropylamine), were synthesized from a tridentate Schiff base ligand H2L (2-[(E)-(2-hydroxybenzylidene) amino] phenol) and Ni(CH3COO)(2)center dot 4H(2)O, using different solvents and their ratios (CH3OH and/or CH2Cl2). The prepared Ni-4 complexes are of different structural types, involving an Ni4O4 cubane-like core (1) and Ni4O6 defective dicubane-like core (2), with all the Ni atoms hexacoordinated. The complexes were characterized by elemental analysis, FT-IR spectroscopy, variable temperature and field magnetic measurements, and single crystal X-ray analysis. The DFT and CASSCF/NEVPT2 theoretical calculations were utilized to reveal information about the isotropic exchange parameters (J(ij)) and single-ion zero-field splitting parameters (D-i, E-i). The variable temperature magnetic data suggested the competition of the antiferromagnetic and ferromagnetic intracluster interactions in compound 1, which is in contrast to compound 2, where all intracluster interactions are ferromagnetic resulting in the ground spin state S = 4 with an easy-axis type of anisotropy quantified by the axial zero-field splitting parameter D = -0.81 cm(-1). This resulted in the observation of a field-induced slow-relaxation of magnetization (U = 3.3-6.7 K), which means that the complex 2 represents the first Ni-4 single-molecule magnet with the defective dicubane-like topology.

Název v anglickém jazyce

Solvent-induced structural diversity in tetranuclear Ni(II) Schiff-base complexes: the first Ni-4 single-molecule magnet with a defective dicubane-like topology

Popis výsledku anglicky

Two tetranuclear Ni-II complexes, namely [Ni-4(L)(4)(CH(3)OH())3(H2O)]center dot CH3OH (1) and (Pr3NH)(2)[Ni-4(L)(4) (CH3COO)(2)] (2, Pr3N = tripropylamine), were synthesized from a tridentate Schiff base ligand H2L (2-[(E)-(2-hydroxybenzylidene) amino] phenol) and Ni(CH3COO)(2)center dot 4H(2)O, using different solvents and their ratios (CH3OH and/or CH2Cl2). The prepared Ni-4 complexes are of different structural types, involving an Ni4O4 cubane-like core (1) and Ni4O6 defective dicubane-like core (2), with all the Ni atoms hexacoordinated. The complexes were characterized by elemental analysis, FT-IR spectroscopy, variable temperature and field magnetic measurements, and single crystal X-ray analysis. The DFT and CASSCF/NEVPT2 theoretical calculations were utilized to reveal information about the isotropic exchange parameters (J(ij)) and single-ion zero-field splitting parameters (D-i, E-i). The variable temperature magnetic data suggested the competition of the antiferromagnetic and ferromagnetic intracluster interactions in compound 1, which is in contrast to compound 2, where all intracluster interactions are ferromagnetic resulting in the ground spin state S = 4 with an easy-axis type of anisotropy quantified by the axial zero-field splitting parameter D = -0.81 cm(-1). This resulted in the observation of a field-induced slow-relaxation of magnetization (U = 3.3-6.7 K), which means that the complex 2 represents the first Ni-4 single-molecule magnet with the defective dicubane-like topology.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CA - Anorganická chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Dalton Transactions (print)

ISSN

1477-9226

e-ISSN

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Svazek periodika

45

Číslo periodika v rámci svazku

46

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

13

Strana od-do

18622-18634

Kód UT WoS článku

000388369000027

EID výsledku v databázi Scopus

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