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A three-dimensional supramolecular compound [Mn(N 3 ) 2 (H 2 O) 3 (hmt)] n , where hmt stands for hexamethylenetetramine, was synthesized and characterized by IR, crystal structure and magnetic susceptibility. The compound [Mn(N 3 ) 2 (H 2 O) 3 (hmt)] n , crystallizes in the orthorhombic system, space group P n 2 1 a , with a = 6.5201(9), b = 9.322(2), c = 22.192(3) Å, β = 90° and Z = 2. The Mn atom is coordinated in an octahedral arrangement by three nitrogen atoms from three azido ions, and three oxygen atoms from three water molecules, respectively. The azide ligand bridges Mn atoms in µ-1,3 fashion, forming a zigzag chain. Hmt connected with the zigzag chain by hydrogen bonds, to form a three-dimensional supramolecular structure. The magnetic susceptibility data show that there is an antiferromagnetic exchange interaction in the title compound. The data were modeled using an infinite chain model leading to J = - 4.8 cm -1 . [ABSTRACT FROM AUTHOR]