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.

Keywords:

• Mixed solvent
• coordination polymers
• crystal structure
• DMF/H2O
• DMA/H2O

Additional information

Funding

Financial support from the National Natural Science Foundation of China (21471125), the Opening Project of PCOSS, Xiamen University(No. 201921), Excellent Talent Foundation of Education Department of Anhui Province (No. gxyq2018055), the Natural Science Foundation of the Education Department of Anhui Province (No. KJ2019A0731, KJ2020A0096), the fifth batch of “special branch plan” projects in Anhui Province were appreciated.