SYNTHESIS AND CRYSTAL-STRUCTURE DETERMINATION OF A ONE-DIMENSIONAL END-TO-END CYANATE-BRIDGED COPPER(II) COMPOUND

The compound [{CuL(mu-NCO)}(n)][ClO4](n) 1 (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 P2(1)/nb, a = 6.534(2), b = 10.945(3), c = 22.683(4) Angstrom, 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 = 1/2 linear chain, giving the parameters 2J = -1.26 cm(-1) and g = 2.10. Polycrystalline powder ESR spectra recorded at 4, 77, 180 and 298 K remained unchanged, showing axial distortion with g(parallel to) = 2.21 and g(perpendicular to) = 2.06. The single-crystal ESR spectrum was also recorded at room temperature: g(1) = 2.059, g(2) = 2.055, g(3) = 2.213.