Synthesis and crystal structure determination of a one-dimensional end-to-end cyanate-bridged copper(II) compoun
Abstract
The compound [{CuL(µ-NCO)}n][ClO4]n1(L =N, N, N′, N″, N″-pentamethyl-3-azapentane-1, 5-diamine) was synthesized and characterized. The crystal structure was determined by single-crystal X-ray analysis: orthorhombic, space group P21nb, a= 6.534(2), b= 10.945(3), c= 22.683(4)Å, Z = 4. The magnetic behaviour was recorded between 290 and 2 K, showing antiferromagnetic coupling. The magnetic susceptibility data were fitted to the expression for a homogeneous S=½ linear chain, giving the parameters 2J=–1.26 cm–1and g= 2.10. Polycrystalline powder ESR spectra recorded at 4, 77, 180 and 298 K remained unchanged, showing axial distortion with g∥= 2.21 and g⊥= 2.06. The single-crystal ESR spectrum was also recorded at room temperature: g1= 2.059, g2= 2.055, g3= 2.21 3.