Two new azido bridging Mn(II) 1D systems: Synthesis and characterization of trans-[Mn(N3)2(2-aminopyridine)2]n and trans-[Mn(N3)2(4-azidopyridine)2]n

Two new manganese(II) azido complexes [Mn(L)2(N3)2]n with L = 2-aminopyridine (1) and 4-azidopyridine (2) have been synthesized and structurally characterized by spectroscopic and crystallographic methods. Both complexes 1 and 2 crystallize in the triclinic system, space group P-1, and their structures are featuring six-coordinate manganese centres, chains of [Mn(N3)2]n, and two trans 2-aminopyridine or 4-azidopyridine ligands giving 1D systems. In the [Mn(N3)2]n-chains of 1 each manganese atom is connected by double di end-on (EO) azido bridges forming cyclic Mn2N2 units, whereas in 2, the metal centers are alternatively bridged by double di-end-to-end (EE) and double di end-on (EO) azido ligands. The intra-chain Mn…Mn distances are 3.5350(12) in 1, and 3.3701(18) and 5.032(3) Å, in 2, respectively. In 1 the polymeric chains of polyhedra are connected by hydrogen bonds of type N–H…N to generate a 2D supramolecular network. Magnetic susceptibility measurements were performed only for complex 1 which shows weak ferromagnetic interactions with a J value of 1.2 cm−1.