Assembly of a Novel Dumbbell-type Dinuclear Copper(II) Complex: Synthesis, Structure and Properties

A new dumbbell-type 4,4′-bipy-bridged dinuclear copper(II) complex, [Cu2(4,4′-bipy)L2(H2O)2](ClO4)4·8CH3OH·10H2O, where L = 1-[bis(3-aminopropyl)amino]-2- propanol and bipy = bipyridine, has been synthesized and characterized, X-ray crystallographic analysis shows that the [Cu2(4,4′-bipy)L2(H2O)2]4+ cations and water molecules generate layer structures extending parallel to bc planes through hydrogen bonding interactions of O–H···O and C–H···O. The layers are also connected by hydrogen bonding interactions involving methanol, water, and perchlorate anions. These interactions lead to the formation of rectangular channels of 12.3 A × 6.0 A along the crystallographic c axis. Perchlorate anions fill in each channel in a sandwich-like packing mode, they are joined with the adjacent layers by water heptamers. Magnetic susceptibility measurements show that the magnetic exchange interaction is weak although it has a regular π-type electron transfer pathway. Furthermore, the electrochemical and thermogravimetric properties of the complex were also investigated.