Two copper(II) azido complexes of the types mononuclear [Cu(TMEDA)2(N3)2] (1) and dinuclear
[Cu(TMEDA)(μ1,1-N3)(N3)]2 (2) [TMEDA = trimethylenediamine; N3
– = azide ion] have been
synthesized and characterized. X-ray structural analysis revealed that each copper(II) center in complex
1 adopts a distorted octahedron geometry with a CuN6 chromophore ligated through four N atoms of
two different symmetrical TMEDA ligands as bidentate chelator and two N atoms of two terminal
azides. In complex 2, each copper(II) center adopts a distorted square pyramidal geometry with a
CuN5 chromophore ligated through two N atoms of TMEDA as bidentate chelator and two N atoms of
two different azides as μ1,1-N3 bridging mode and one N atom of terminal azide ion. The two copper
centers are connected through double μ1,1-N3 bridges affording a dinuclear structure with Cu···Cu
separation 3.327(2) Å. In crystalline state, mononuclear units in complex 1 are associated through
intermolecular N-H···N and C-H···N hydrogen bonds to form a 2D sheet structure viewed along
crystallographic b-axis, whereas dinuclear entities in complex 2 are propagated through intermolecular
N-H···N and C-H···N hydrogen bonds to form a 3D network structure viewed along crystallographic
a-axis. The Variable-temperature magnetic susceptibility measurement evidenced a dominant
antiferromagnetic interaction between the metal centers through μ1,1-azide bridges in complex 2 with J =
− 0.40 cm-1. The antibacterial activities of the complexes have also been studied.