Synthesis, Structure, and Magnetic Behavior of Two New 1D Polymeric Manganese Azido Complexes

Two new Mn II one‐dimensional compounds with formulae [Mn(μ‐N 3 ) 2 (pyzamid) 2 ] n ( 1 ) and [Mn 2 (3‐ampy) 4 (μ‐N 3 ) 2 (N 3 ) 2 (H 2 O) 2 ] n , ( 2 ) (pyzamid = pyrazineamide and 3‐ampy = 3‐aminopyridine) were structurally and magnetically characterized. Compound 1 crystallizes in the monoclinic system, P 2/ c space group, and polymerizes through double end‐on azido bridges giving 1D chains with the Mn II atoms in a MnN 6 environment. Compound 2 crystallizes in the triclinic system, P $\bar {1}$ space group, and consists of alternate [Mn(3‐ampy) 2 (μ‐N 3 ) 2 (N 3 ) 2 ] and [Mn(3‐ampy) 2 (μ‐N 3 ) 2 (H 2 O) 2 ] octahedrons (MnN 6 – MnN 4 O 2 environments), linked by single end‐to‐end azido bridges. Both chains show very uncommon topologies. Attemps to obtain manganese/azido derivatives with the qux = quinoline‐4‐carboxylato anion gave the recently reported compound [Mn(μ‐qux) 2 (μ‐H 2 O)] n ( 3 ), which consists of a chain with only carboxylato and aqua bridges with the Mn II atoms in a MnO 6 slightly distorted octahedron. In good agreement with the expected behavior, magnetic susceptibility measurements show weak ferromagnetic interactions for 1 , whereas compound 2 exhibits moderate antiferromagnetic coupling.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)