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A Mixed Valence CoIICoIII2 Field-Supported Single Molecule Magnet: Solvent-Dependent Structural Variation.

ABSTRACT: One-pot reaction of the Schiff base N,N'-ethylene bis(salicylaldimine) (H2L), CoCl2.6H2O, and [Ph2SnCl2] in acetone produces the mixed valence CoIICoIII2 compound [CoIICoIII2(?-L)2(Ph)2(?-Cl)2]·(CH3)2CO·H2O (1). Our recent study already revealed that the same reaction mixtures in methanol or ethanol produced a heterometallic SnIVCoIII (2) or monometallic CoIII complex (3), respectively. Comparison of these organometallic systems shows that the 2,1-intermetallic Ph shift occurs in any of those solvents, but their relevant structural features (mononuclear, dinuclear-heterometallic, and trinuclear mixed valence) are solvent dependent. Geometrical structural rotation is also discussed among the related organometallic CoIICoIII2 systems. The AC magnetic susceptibility measurements indicate that 1 is a single molecule magnet (SMM), exhibiting a field-induced slow magnetic relaxation with two modes. The relaxation time for the low-frequency channel is as slow as ?~0.6 s at T = 2.0 K and BDC = 1.0 T.

SUBMITTER: Hazra S 

PROVIDER: S-EPMC7922140 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature

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A Mixed Valence Co<sup>II</sup>Co<sup>III</sup><sub>2</sub> Field-Supported Single Molecule Magnet: Solvent-Dependent Structural Variation.

Hazra Susanta S   Rajnák Cyril C   Titiš Ján J   Guedes da Silva M Fátima C MFC   Boča Roman R   Pombeiro Armando J L AJL  

Molecules (Basel, Switzerland) 20210218 4

One-pot reaction of the Schiff base <i>N</i>,<i>N</i>'-ethylene bis(salicylaldimine) (H<sub>2</sub>L), CoCl<sub>2</sub>.6H<sub>2</sub>O, and [Ph<sub>2</sub>SnCl<sub>2</sub>] in acetone produces the mixed valence Co<sup>II</sup>Co<sup>III</sup><sub>2</sub> compound [Co<sup>II</sup>Co<sup>III</sup><sub>2</sub>(μ-L)<sub>2</sub>(Ph)<sub>2</sub>(μ-Cl)<sub>2</sub>]·(CH<sub>3</sub>)<sub>2</sub>CO·H<sub>2</sub>O (<b>1</b>). Our recent study already revealed that the same reaction mixtures in methanol or  ...[more]

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