Two μ1,5-dicyanamide bridged 2D and 3D metal complexes formed by covalent bonding and weak interactions

One 2D and one 3D dicyanamide bridged complexes, [Cu(dca)2(et2-en)]n (1) and [Mn(dca)2(im)2]n (2) [dca=dicyanamide, et2-en=N,N-diethyl-ethylenediamine, im=imidazole], have been synthesized. Both the complexes are 1D by covalent bonding but interchain H-bonding promotes dimensionality. Moreover, π–π interaction among the imidazole ligands also plays an important role to have an interlocked 3D structure for 2. Magnetic study of both the complexes shows weak antiferromagnetic interaction between the metal centers. The magnetic data have been fitted with appropriate equations yielding best fit parameters for 1: J=−0.58±0.02 cm−1, g=2.11±0.01 with R=3.2×10−6 and for 2, J=−0.21 cm−1, g=2.00 and R=5.6×10−4.