A novel 1D chain of azido bridged copper(II) with a salen-type di-Schiff base ligand

One new complex of Cu(II), [(CuL)2Cu3(N3)6]n (1) has been synthesized by reacting the “ligand complex”, [CuL] with copper acetate and sodium azide (NaN3) in methanol–water where the di-Schiff base ligand H2L = N,N′-bis(α-methylsalicylidene)-1,3-propanediamine. The X-ray single crystal structural analysis shows that complex 1 consists of an incomplete face-sharing double cube of four Cu(II) ions with the formula of [(CuL)2Cu2(N3)2]2+ which are connected by [Cu(N3)4]2− unit to form a novel 1D chain.

► Synthesis and crystal structure of one novel Cu(II)-azide complex with di-Schiff base ligand.
► The complex is a pentanuclear, 1D coordination polymer formed by μ1,1 and μ1,1,1-azido bridge.
► It contains an incomplete face-sharing double cube.
► This chain structure is unprecedented among the Cu(II)-azide polymers.