Co II 4 , Co II 7 , and a Series of Co II 2 Ln III (Ln III = Nd III , Sm III , Gd III , Tb III , Dy III ) Coordination Clusters: Search for Single Molecule Magnets

• Published in: Inorganic chemistry Vol. 55; no. 20; pp. 10192 - 10202
• Main Authors: Modak, Ritwik, Sikdar, Yeasin, Thuijs, Annaliese E, Christou, George, Goswami, Sanchita
• Format: Journal Article
• Language: English
• Published: United States 17.10.2016
• ISSN: 0020-1669; 1520-510X
• DOI: 10.1021/acs.inorgchem.6b01402

We report herein the syntheses and investigation of the magnetic properties of a Co compound, a series of trinuclear Co Ln (Ln = Nd , Sm , Gd , Tb , Dy ) complexes, and a Co complex. The homometallic Co core was obtained from the reaction of Ln(NO ) ·xH O/Co(NO ) ·6H O/H vab/Et N in a 0.5:0.5:1:2 ratio in methanol. Variation in synthetic conditions was necessary to get the desired Co -Ln complexes. The Co -Ln assembly was synthesized from Ln(NO ) ·xH O/Co(OAc) ·4H O/H vab/NaOMe in a 0.4:0.5:1:1 ratio in methanol. The isostructural Co Ln complexes have a core structure with the general formula [Co Ln(Hvab) (NO )](NO ) ·MeOH·H O, (where H vab = 2-[(2-hydroxymethyl-phenylimino)-methyl]-6-methoxy-phenol) with simultaneous crystallization of Co complex in each reaction. The magnetic investigation of these complexes reveals that both homometallic complexes and four Co -Ln complexes (except Co -Nd ) display behavior characteristic of single molecule magnets.