ic6b01402_si_003.cif (13.99 kB)

CoII4, CoII7, and a Series of CoII2LnIII (LnIII = NdIII, SmIII, GdIII, TbIII, DyIII) Coordination Clusters: Search for Single Molecule Magnets

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posted on 03.10.2016, 16:04 by Ritwik Modak, Yeasin Sikdar, Annaliese E. Thuijs, George Christou, Sanchita Goswami
We report herein the syntheses and investigation of the magnetic properties of a CoII4 compound, a series of trinuclear CoII2LnIII (LnIII = NdIII, SmIII, GdIII, TbIII, DyIII) complexes, and a CoII7 complex. The homometallic CoII4 core was obtained from the reaction of Ln­(NO3)3·xH2O/­Co­(NO3)2·6H2O/­H2vab/Et3N in a 0.5:0.5:1:2 ratio in methanol. Variation in synthetic conditions was necessary to get the desired CoII–LnIII complexes. The CoII–LnIII assembly was synthesized from Ln­(NO3)3·xH2O/­Co­(OAc)2·4H2O/­H2vab/NaOMe in a 0.4:0.5:1:1 ratio in methanol. The isostructural CoII2LnIII complexes have a core structure with the general formula [Co2Ln­(Hvab)4­(NO3)]­(NO3)2­·MeOH·H2O, (where H2vab = 2-[(2-hydroxymethyl-phenylimino)-methyl]-6-methoxy-phenol) with simultaneous crystallization of CoII7 complex in each reaction. The magnetic investigation of these complexes reveals that both homometallic complexes and four CoII–LnIII complexes (except CoII–NdIII) display behavior characteristic of single molecule magnets.