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Tuning of magnetic frustration in S=1/2 Kagomé lattices {[Cu3(CO3)2(bpe)3](CLO4)2}n and {[Cu3(CO3)2(bpy)3](CLO4)2}n through rigid and flexible ligands

M. O. Ajeesh,A. Yogi,M. Padmanabhan,R. Nath

Published 2014 in Solid State Communications

ABSTRACT

Abstract Single crystalline and polycrystalline samples of S = 1 / 2 Kagome lattices { [ Cu 3 ( CO 3 ) 2 ( bpe ) 3 ] ( CLO 4 ) 2 } n and { [ Cu 3 ( CO 3 ) 2 ( bpy ) 3 ] ( CLO 4 ) 2 } n , respectively were synthesized. Their structural and magnetic properties were characterized by means of x-ray diffraction and magnetization measurements. Both compounds crystalize in a hexagonal structure (space group P−6) consisting of CuO4 Kagome layers in the ab-plane but linked along c direction through either rigid bpy or flexible bpe ligands to form 3D frame works. Magnetic measurements reveal that both the compounds undergo ferromagnetic ordering ( T C ) at low temperatures and the T C and the extent of frustration could be tuned by changing the nature of the pillar ligands. {[Cu3(CO3)2(bpe)3](CLO4)2}n which is made up of flexible bpe ligands has a T C of 5.7 K and a Curie-Weiss temperature ( θ CW ) of −39.7 K giving rise to a frustration parameter of | θ CW | / T C ≃ 6.96 . But the replacement of bpe by a more rigid and electronically delocalized bpy ligand leads to an enhanced T C ≃ 9.3 K and a reduced frustration parameter of | θ CW | / T C ≃ 3.54 .

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