CoII4, CoII7, and a Series of CoII2LnIII (LnIII = NdIII, SmIII, GdIII,TbIII, DyIII) Coordination Clusters: Searchfor Single Molecule Magnets Article Swipe
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· 2016
· Open Access
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· DOI: https://doi.org/10.1021/acs.inorgchem.6b01402.s002
· OA: W3080888867
We report herein\nthe syntheses and investigation of the magnetic properties of a Co<sup>II</sup><sub>4</sub> compound, a series of trinuclear Co<sup>II</sup><sub>2</sub>Ln<sup>III</sup> (Ln<sup>III</sup> = Nd<sup>III</sup>, Sm<sup>III</sup>, Gd<sup>III</sup>, Tb<sup>III</sup>, Dy<sup>III</sup>) complexes, and a Co<sup>II</sup><sub>7</sub> complex. The homometallic\nCo<sup>II</sup><sub>4</sub> core was obtained from the reaction of\nLn(NO<sub>3</sub>)<sub>3</sub><b>·</b><i>x</i>H<sub>2</sub>O/Co(NO<sub>3</sub>)<sub>2</sub><b>·</b>6H<sub>2</sub>O/H<sub>2</sub>vab/Et<sub>3</sub>N in a 0.5:0.5:1:2 ratio in\nmethanol. Variation in synthetic conditions was necessary to get the\ndesired Co<sup>II</sup>–Ln<sup>III</sup> complexes. The Co<sup>II</sup>–Ln<sup>III</sup> assembly was synthesized from Ln(NO<sub>3</sub>)<sub>3</sub><b>·</b><i>x</i>H<sub>2</sub>O/Co(OAc)<sub>2</sub><b>·</b>4H<sub>2</sub>O/H<sub>2</sub>vab/NaOMe in a 0.4:0.5:1:1 ratio in methanol. The isostructural\nCo<sup>II</sup><sub>2</sub>Ln<sup>III</sup> complexes have a core\nstructure with the general formula [Co<sub>2</sub>Ln(Hvab)<sub>4</sub>(NO<sub>3</sub>)](NO<sub>3</sub>)<sub>2</sub><b>·</b>MeOH<b>·</b>H<sub>2</sub>O, (where H<sub>2</sub>vab =\n2-[(2-hydroxymethyl-phenylimino)-methyl]-6-methoxy-phenol) with simultaneous\ncrystallization of Co<sup>II</sup><sub>7</sub> complex in each reaction.\nThe magnetic investigation of these complexes reveals that both homometallic\ncomplexes and four Co<sup>II</sup>–Ln<sup>III</sup> complexes\n(except Co<sup>II</sup>–Nd<sup>III</sup>) display behavior\ncharacteristic of single molecule magnets.
