Influences of mixed solvent DMF/H2O or DMA/H2O on the topologies of coordination polymers

Abstract

Four coordination polymers were prepared by solvent-thermal method with Zn(NO3)2·6H2O and H2dmbdc (H2dmbdc= 2,5-dimethylbenzenedicarboxylic acid) or H2ip(H2ip = isophthalic acid). Complex 1, [Zn3(dmbdc)3(dmf)2]n shows 2D (3,6) net with trizinc secondary building units (SBUs) was obtained in DMF; Complex 2, {[Zn4O(dmbdc)3(dmf)NH(CH3)2]·DMF}n was synthesized in DMF/H2O (volume ratio 1:1), and Complex 2 is 3D porous framework with Zn4O tetrahedral SBUs; however, only Complex 3, [Zn3(dmbdc)3(dma)2]n was obtained in DMA and DMA/H2O (volume ratio 1:1), and Complex 3 is isomorphic to 1 except the DMF was replaced with DMA; Complex 4, {[Zn4O(H2O)(ip)3 (dma)]·2DMA}n also contain Zn4O tetrahedral SBUs in both DMA and DMA/H2O(1:1). Therefore, the change of single solvent (DMF or DMA) have not obvious effect on the structures of coordination polymers, however, there are evident change in the topology of coordination polymers when we make use of water mixed with the different polarity solvents DMF or DMA.