Three novel polymeric frameworks assembled from CdII, CoII, and MnII with the mixed organic ligands 3,4-pyridinedicarboxylate, 1,3-bis(4-pyridyl)propane, or 1,2-bis(4-pyridyl)ethane

Hydrothermal reactions of Cd-II, Co-II, and Mn-II with the mixed ligands 3,4-pyridinedicarboxylate (pydc), 1,3-bis(4-pyridyl)-propane (bpp), or 1,2-bis(4-pyridyl)ethane (bpe) gave crystals of {[Cd(pydc)(bpp)].0.5H(2)O}(n) (1), {[Co(pydc)(H2O)-(bpe)(0.5)].0.5H(2)O}(n) (2), and {[Mn(pydc) (H2O)(bpe)0.5].0.5H(2)O}(n), (3), respectively. Single-crystal X-ray analyses reveal that these are all three-dimensional non-interpenetrating coordination polymers. Their structures alter markedly with the conformation and the function of the ligands. In 1, the 3,4-pyridinedicarboxylate acted as a three-connector, a coordination topology of the type (3,5) [containing 3 and 5 connected centers] being generated through self-assembly, while in 2 and 3, with the help of the four-connector 3,4-pyridinedicarboxylate and the terminal ligand water molecule, another three-dimensional framework with a coordination topology of the type (4, 5) was obtained. (C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003.