Molecular layer consisting of linear Azido-bridged heptanuclear copper unit: In-situ synthesis, structure and magnetic property

We present here a new example of Cu–azido compound (L′)2[Cu7(N3)16] (1) synthesized using imidazolium-type cationic template in-situ obtained from metal-mediated cyclizations of 2-[(pyridin-2-ylmethylen)amino]ethanol. The compound possesses a rarely observed anionic Cu–azide layer, which consists of [Cu7(N3)16]2− anionic heptanuclear units extensively linked by end-on azido bridges. The molecular geometry results in ferromagnetic interactions within the Cu–azide heptanuclear unit. The title compound displays long-range antiferromagnetic ordering with Néel temperature being ca. 7.85 K.