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)(N-3)(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 bib 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)(N-3)(2)] by dehydration and this is confirmed by IR of the azide ligand. (c) 2006 Elsevier B.V. All rights reserved.