Eshtiagh-Hosseini, Hossein Hassanpoor, Azam Alfi, Nafiseh Mirzaei, Masoud Fromm, Katharina M. Shokrollahi, Ardeshir Gschwind, Fabienne Karami, Elham 2010-05-13 A 3-D metal-organic coordination polymer based on pyrazine-2,3-dicarboxylic acid (pzdcH₂) formulated as {[Mn(pzdc)(H₂O)₂] · 2H₂O}<i>_n</i> (<b>1</b>), was obtained by the treatment of MnCl₂ · 6H₂O with pzdcH₂, 8-hydroxy quinoline (8-HQ), and 2-amino-4-methyl pyridine (ampy). In this study, we describe the synthesis, elemental analysis, IR spectroscopy, TG analysis, and single X-ray diffraction. The X-ray single crystal structure reveals that the chemical environment around each Mn(II) is a distorted octahedral by participating one nitrogen, five oxygens from three (pzdc)²⁻ and two water molecules, O₅MnN. The centrosymmetric 1-D ladder-like structure of <b>1</b> is bridged by oxygens of (pzdc)²⁻, and Mn-pzdc-Mn bonds are the rungs for our ladder structure. In the crystal structure, intermolecular O-H ··· O hydrogen bonds result in the formation of a supramolecular structure, effective for the stabilization of the structure. The thermal decomposition of <b>1</b> indicates that it is quite thermally stable. The protonation constants of ampy, 8-HQ and pzdcH₂ as the building blocks of proton transfer systems including pzdcH₂-ampy and pzdcH₂-8-HQ and the corresponding stability constants of these systems were determined by potentiometric study. The stoichiometry and stability constants of complexes of pzdcH₂-ampy and pzdcH₂-8-HQ with Mn²⁺ were investigated by this method in aqueous solution. The results obtained from solution study are comparable with the solid state results. application/pdf https://folia.unifr.ch/global/documents/301699 https://folia.unifr.ch/documents/301699/files/fro_sxr.pdf eng info:eu-repo/semantics/altIdentifier/doi/10.1080/00958972.2010.508518 info:eu-repo/semantics/openAccess License undefined Journal of Coordination Chemistry. - 2010, vol. 63, no. 18, p. 3175-3186 Manganese Pyrazine-2,3-dicarboxylic acid Crystal structure Coordination polymer Solution studies info:eu-repo/classification/udc/54 Synthesis, X-ray crystal structure, thermal and solution studies of a centrosymmetric metal-organic polymer based on proton transfer methodology http://purl.org/coar/resource_type/c_6501