NDLI: Magnetic properties of the seven-coordinated nanoporous framework material $Co(bpy)_{1.5}(NO_{3})

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Bartolomé, Juan Turta, Constantin Luzón, Javier Alonso, Pablo Javier Bartolomé, Elena Arauzo, Ana Racles, Carmen
Description	Author Affiliation: Bartolomé E ( Escola Universitària Salesiana de Sarrià, Barcelona, Spain. ebartolome@euss.es)
Abstract	The magnetic properties of the porous metal–organic complex $Co(bpy)_{1.5}(NO_{3})_{2}$ ( bpy = 4,4′-bipyridine ), investigated by SQUID magnetometry , EPR and heat capacity measurements, are reported. The tongue-and-groove structure of this complex is formed by the assembly of T-shaped building blocks, where each Co is bound to three bpy ligands . Co(II) is hepta-coordinated by three N atoms from the bpy units, and four O atoms from two nitrate groups. Experimental results showed a large crystal field effect induced anisotropy with a zero field splitting of Δ = 198 K between the ground and excited Kramers doublets, a factor of two larger than previously reported values in Co(II) hepta-coordinated complexes. EPR revealed orthorhombic crystal field anisotropy, with gyromagnetic principal values of $g_{1}^{}$ = 6.1, $g_{2}^{}$ = 4.2 and $g_{3}^{}$ = 2.2, in an $S^{}$ = 1/2 effective spin on the ground state Kramers doublet. Ab initio simulations allowed us to assign the anisotropy easy axis of magnetization to the binary symmetry axis of the molecule, aligned with the Co–N apical direction of the T-block.
ISSN	14779226
Issue Number	34
Journal	Dalton Trans.
Volume Number	41
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2012-09-14
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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