Three coordination polymers with helical chains based on methylenediisophthalic acid (H4MDIP)

Based on methylenediisophthalic acid (H4MDIP), three novel coordination polymers {[Mn-2(MDIP)(bime)(H2O)(2)](2)center dot 2H(2)O}(n) (1) [bime 1,2-ethanediylbis(imidazole)], {[Mn-3(HMDIP)(2)(H2O)(4)]center dot 4,4'-bipy center dot 3H(2)O}(n) (2) [4,4'-bipy 4,4'-bipyridine], and {[Co-5(MDIP)(2)(H2O)(6)(mu-OH)(2)]center dot 7H(2)O}(n) (3) have been synthesized and characterized by IR spectra, single-crystal X-ray diffraction analyses and thermal stability studies. The introduction of the bime and 4,4'-bipy ligands into Mn(CH3COO)(2)center dot 4H(2)O and H4MDIP system leads to the formation of complexes 1 and 2, and the absence of the second ligand in the Co(NO3)(2)center dot 6H(2)O and H4MDIP system leads to shape complex 3. Complex 1 is a 3D architecture with [Mn(-OCO-)](infinity) helical chain. Coordination polymer 2 is a 2D sheet structure with trinuclear unit, in which two kinds of 2(1) helical chains ([Mn(IP)](infinity) (IP isophthalic acid) and [Mn(MDIP)](infinity)) are included. Complex 3 exhibits the 3D porous structure with a pentanuclear cobalt unit in which a 1D shallow helical chain of hydrogen-bonded water molecules is shaped. From the topology point of view, complex 1 exhibits a (4,6)-connected network with the Schlafli symbol (4(2).6(3).8)(2)(4(4).6(2).7(4).8(4).9), complex 2 displays a (3,6)-connected network with CdI2 topology, and complex 3 displays a (4, 8)-connected network with Schlafli symbol (4(4).6(2))(2)(4(16).6(12)) which is a decorated scu net.