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.