Coordination polymers constructed by 1,3-bi(4-pyridyl)propane with four different conformations and 2,2′-dinitro-4,4′-biphenyldicarboxylate ligands: the effects of metal ions

Five coordination polymers, [Mn-2(NBPDC)(2)(bpp)](n) (1), [Co-4(NBPDC)(4)(bpp)(2)(H2O)(5.25)](n) (2), [Ni(NBPDC)(bpp)(H2O)(2)](n) (3), [Zn(NBPDC)(bpp)](n) (4) and [Cd-2(NBPDC)(2)(bpp)](n) (5) (NBPDC = 2,2'-dinitro-4,4'-biphenyldicarboxyl acid, bpp = 1,3-bi(4-pyridyl)propane), have been prepared and structurally characterized. In these compounds, NBPDC and bpp exhibit different coordination modes tuned by different metal ions, and construct various architectures by bridging a variety of inorganic building units. Compound 1 presents a hex net with point symbol for net: {3(6).4(18).5(3).6}. Compound 2 shows a self-penetrating ilc topology by linking Co-4 clusters with NBPDC and bpp. Compound 3 presents a 2D structure with (4, 4) topology. Compound 4 shows a diamond network with a 5-fold interpenetrating architecture, featuring left-handed and right-handed helix chains. Compound 5 presents a pcu topology by linking rod-shaped secondary building units. The magnetic properties of compounds 1 and 2 have been characterized.