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

Abstract

Five coordination polymers, [Mn2(NBPDC)2(bpp)]n (1), [Co4(NBPDC)4(bpp)2(H2O)5.25]n (2), [Ni(NBPDC)(bpp)(H2O)2]n (3), [Zn(NBPDC)(bpp)]n (4) and [Cd2(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: {36.418.53.6}. Compound 2 shows a self-penetrating ilc topology by linking Co4 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.