CoII4, CoII7, and a Series of CoII2LnIII(LnIII= NdIII, SmIII, GdIII, TbIII, DyIII) Coordination Clusters: Search for Single Molecule Magnets.
We report herein the syntheses and investigation of the magnetic properties of a CoII4compound, a series of trinuclear CoII2LnIII(LnIII= NdIII, SmIII, GdIII, TbIII, DyIII) complexes, and a CoII7complex. The homometallic CoII4core 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-LnIIIcomplexes. The CoII-LnIIIassembly 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 CoII2LnIIIcomplexes 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 CoII7complex in each reaction. The magnetic investigation of these complexes reveals that both homometallic complexes and four CoII-LnIIIcomplexes (except CoII-NdIII) display behavior characteristic of single molecule magnets.
Department of Chemistry, University of Calcutta , 92, A. P. C. Road, Kolkata 700009, India.
Ritwik
R
Modak
Department of Chemistry, University of Calcutta , 92, A. P. C. Road, Kolkata 700009, India.
Yeasin
Y
Sikdar
Department of Chemistry, University of Florida , Gainesville, Florida 32611-7200, United States.
Annaliese E
AE
Thuijs
Department of Chemistry, University of Florida , Gainesville, Florida 32611-7200, United States.
George
G
Christou
Department of Chemistry, University of Calcutta , 92, A. P. C. Road, Kolkata 700009, India.
Sanchita
S
Goswami