New Mononuclear Cu(II) Complexes and 1D Chains with 4-Amino-4H-1,2,4-triazole

The crystal structures of two mononuclear Cu(II) NH(2)trz complexes [Cu(NH(2)trz)(4)(H(2)O)](AsF(6))(2) (I) and [Cu(NH(2)trz)(4)(H(2)O)](PF(6))(2) (II) as well as two coordination polymers [Cu(μ(2)-NH(2)trz)(2)Cl]Cl·H(2)O (III) and [Cu(μ(2)-NH(2)trz)(2)Cl] (SiF(6))(0.5)·1.5H(2)O (IV) are presented. Cationic 1D chains with bridging bis-monodentate μ(2)-coordinated NH(2)trz and bridging μ(2)-coordinated chloride ligands are present in III and IV. In these coordination polymers, the Cu(II) ions are strongly antiferromagnetically coupled with J = −128.4 cm(−1) for III and J = −143 cm(−1) for IV (H = −J∑S(i)S(i)(+1)), due to the nature of the bridges between spin centers. Inter-chain interactions present in the crystal structures were taken into consideration, as well as g factors, which were determined experimentally, for the quantitative modeling of their magnetic properties.