Hydroxide-Bridged Mixed-Valence Tetranuclear Cobalt 4-Nitrophenol Inclusion Complex Showing Single Molecule Magnet Property - Sorbonne Université
Journal Articles ChemistrySelect Year : 2017

Hydroxide-Bridged Mixed-Valence Tetranuclear Cobalt 4-Nitrophenol Inclusion Complex Showing Single Molecule Magnet Property

Abstract

Two tetranuclear hydroxide-bridged mixed-valence cobalt complexes, one having 4-nitrophenolate anions and other having 4-nitrophenol as guest, namely [(μ2-dea)2(phen)2Co2(μ3-OH)2Co2(phen)2](np)4\textbullet H2O (1), [(μ2-dea)2(phen)2Co2(μ3-OH)2 Co2(phen)2]Cl4\textbullet 2Hnp\textbullet 9H2O (2) (Hnp=4-nitrophenol, phen=1,10-phenanthroline, dea=di-deprotonated diethanolamine) were synthesized and structurally characterized. Complex cation of these two complexes are based on Co4O4(OH)2 units where two cobalt ions are in Co2+ and other two are in Co3+ oxidation states. Reaction of same set of reactants namely phen, Hnp and diethanolamine with cobalt nitrate in presence or absence of hydrochloric acid resulted complex 1 and 2 respectively. The two triply-bridging hydroxides of complex 1 are in identical environment, but the complex 2 has two triply-bridging hydroxides in slightly different environments having differences in Co-O(hydroxide) bond distances around them. Complex 2 is ferromagnetic and shows field induced Single Molecule Magnets (SMM) behavior.
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Dates and versions

hal-02887487 , version 1 (02-07-2020)

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Krapa Shankar, Abhishake Mondal, Yanling Li, Yves Journaux, Jubaraj B. Baruah. Hydroxide-Bridged Mixed-Valence Tetranuclear Cobalt 4-Nitrophenol Inclusion Complex Showing Single Molecule Magnet Property. ChemistrySelect, 2017, 2 (26), pp.7792--7798. ⟨10.1002/slct.201701328⟩. ⟨hal-02887487⟩
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