Two new 3D architectures of Cu(II): Syntheses, crystal structures and low temperature magnetic studies

Two new 3D frameworks based upon copper(II) and 1,2-bis(4-pyridyl)ethane (bpe), [Cu(bpe)(H2O)(2)] (ClO4)(2) (1) and [Cu(bPe)(2)(dca)(2)] (2) [dca = dicyanamide anion], have been synthesised and characterised by variable temperature magnetic susceptibility measurements down to 2 K. Complex (1) is a ID chain with coordinated bpe and water molecules, this chain on interchain H-bonding through counter perchlorate anions and coordinated water produces a 3D architecture. While complex (2) is a alpha-Po mimetic interlocked 3D architecture produced by the interpenetration of 3D network of Cu(II) with bridging bpe and dca. Low temperature magnetic behaviour down to 2 K reveals the existence of very weak antiferromagnetic interaction in complex 1 whereas complex 2 shows the presence of ferromagnetic interaction through the dca pathway.