摘要:
Four new copper(II) complexes, derived from the cyanato ligand and tridentate amines, with different nuclearity and different coordination modes, have been synthesized and their crystal structures determined by X-ray diffraction methods: [Cu(NCO)(Et(5)dien)](ClO4) (1), mononuclear, [Cu-2(mu(1,3)-NCO)(2)(EtMe(4)dien)(2)](ClO4)(2) (2), dinuclear, [Cu(mu-ClO4)(NCO)(ept)](n) (3), monodimensional, and [Cu-2(mu(1,1)-NCO)(2)(Medien)(2)](ClO4)(2) (4), dinuclear. Et(5)dien is 1,1,4,7,7-pentaethyldiethylenetriamine, EtMe(4)dien is 4-ethyl-1,1,7,7-tetramethyldiethylenetriamine, ept is N-(2-aminoethyl)-1,3-propanediamine and Medien is 4-methyldiethylenetriamine. Magnetic susceptibility data, measured from 2-300 K, show slight ferromagnetic coupling for the dinuclear end-to-end (mu(1,3)) compound 2, antiferromagnetic coupling for the dinuclear end-on (mu(1,1)) 4, and antiferromagnetic coupling for the mu-ClO4, monodimensional compound 3. These data were fitted to the appropriate equations derived from the Hamiltonian H = -JS(1)S(2) giving the parameters J = +0.5(2) cm(-1), g = 2.088(3) and J = -4.6(3) cm(-1), g = 2.099(13) for 2 and 4, respectively and J = -1.9(1) cm (-1), g = 2.121(7) for 3. (C) 1999 Elsevier Science S.A. All rights reserved.