Syntheses and crystal structures of four manganese coordination polymers with 1,4-bis(1,2,4-triazol-1-yl)butane

Four new mangenese coordination polymers {[Mn(btb)(H2O)4](NO3)2}n (1), [Mn(btb)2(NO3)2]n (2), {[Mn(btb)2(H2O)2](NO3)2(H2O)2}n (3) and [Mn(btb)(H2O)2(N3)2]n (4) were synthesized in different solvent systems using the flexible ligand 1,4-bis(1,2,4-triazol-1-yl)butane (btb). The X-ray diffraction analysis shows that 1 and 4 are one-dimensional chain structures, while 2 and 3 form planar and undulating two-dimensional (4, 4) networks, respectively. 1 and 4 further form three-dimensional hydrogen bonding networks via hydrogen bonding interactions. The btb ligands exhibit the completely anti conformation in 1, 2 and 4, and the anti–anti–gauche conformation in 3. The thermogravimetric properties of the four coordination polymers were investigated. 3 can convert to 2 by dehydration which is shown by XPRD measurement. 4 can convert to [Mn(btb)(N3)2] by dehydration and this is confirmed by IR of the azide ligand.