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Different Complexation Behavior of a Proton Transfer Compound Obtained from Pyridine-2,6-dicarboxylic Acid and Creatinine with Tl(I), Cu(II), Fe(III) and Bi(III): Synthesis, Characterization, Crystal Structures and Solution Studies

Aghabozorg H., Ramezanipour F., Soleimannejad J., Sharif M. A., Shokrollahi A., Shamsipur M., Moghimi A., Attar Gharamaleki J., Lippolis V., Blake A. J.

Polish Journal of Chemistry

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2008

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Vol. 82, nr 3

487-507

EN

The different complexation methods of a proton transfer compound, (creatH)(pydcH)źH2O (pydcH2 = pyridine-2,6-di carboxylic acid; creat = creatinine) with metal ions have been studied and formation of [(Tl(pydcH)]n (1), [(Fe(pydc)(H2O)2)2ox]ź6H2O (2), [Cu(pydc)(pydcH2)]ź2H2O (3) and (creatH)2[Bi(pydc)2]2ź4H2O (4) are re ported. The characterization was performed using IR spectroscopy and single crystal X-ray diffraction analysis. The Tl(I) complex [(Tl(pydcH)]n (1) obtained from (creatH)(pydcH)źH2O is a polymeric system, showing only the contribution of the anionic species of (creatH)(pydcH)źH2O to the complexation. The Fe(III) and the Cu(II) complexes [(Fe(pydc)(H2O)2)2ox]ź6H2O (2) (ox = ox a late) and [Cu(pydc)(pydcH2)]ź2H2O (3) were also obtained from (creatH)(pydcH)źH2O. The Bi(III) complex (creatH)2[Bi(pydc)2]2ź4H2O (4) is a dimeric system, showing both contribution of the cationic and anionic fragments. The complexes 1-4 show a variety of structural features including mononuclear, binuclear, polymeric structures and unusual ligand formation. In compounds (1), (2), (3) and (4), a large number of hydrogen bonds are observed. These interactions as well as p-p stacking play an important role in the formation and stabilization of supra molecular systems in the crystal lattices. The stoichiometry and stability of the Cu(II), Tl(I) and Bi(III) complexes with (pydc)(creat) and Fe(III) with pydc-ox mixture in aqueous solution were investigated by potentiometric pH titration.

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Novel Proton Transfer Compounds Containing 2,6-Pyridinedicarboxylic Acid and Melamine and Their PbII Complex: Synthesis, Characterization, Crystal Structure and Solution Studies

Sharif M., Aghabozorg H., Shokrollahi A., Kickelbick G., Moghimi A., Shamsipur M.

Polish Journal of Chemistry

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2006

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Vol. 80, nr 6

847-863

EN

Two novel proton transfer compounds LH2, (tataH2)(pydc), and L'H2, (tataH)2(pydc), (pydcH2 = 2,6-pyridinedicarboxylic acid and tata = melamine, 2,4,6-triamino-1,3,5-triazine), were synthesized and characterized by IR, 1Hand 13C NMRspectroscopy and solid state CPMAS 13C NMR. The (tataH2)2[Pb(pydc)2]2x2tata x4H2O complex (1) was prepared using L'H2and lead(II) nitrate, and characterized by IR andNMRspectroscopy and single crystal X-ray analysis. The PbII complex is a binuclear anionic complex [Pb(pydc)2] 2 4 , in which two metal fragments are linked via a central ten-membered PbN(13)C(18)C(22)O(24)Pb(A)N(13A)C(18A)C(22A)O(24A) ring. Extensive hydrogen bonding between carboxylate groups, (tataH2)2+ and water molecules throughout the PbII complex together with ion pairing play important roles in stabilizing the corresponding lattice. The protonation constants of the reactants, the equilibrium constants for the reaction of pydc with tata and the stoichiometry and stability of the PbII complex with L'H2 in aqueous solution were investigated by potentiometric pH titrations. The stoichiometry of one of themost abundant complexed species in solution was found to be the same as that of the crystalline lead complex.

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Characterization, Crystal Structure, and Solution Studies of a Proton Transfer Compound Obtained from 2,6-Pyridinedicarboxylic Acid and 1,4,10,13-Tetraoxa-7,16-diazacyclooctadecane

Moghimi A., Lippolis V., Aghabozorg H., Shokrollahi A., Shokrollahi A., Sheshmani S., Blake A.

Polish Journal of Chemistry

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2006

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Vol. 80, nr 8

1385-1396

EN

The proton transfer compound, (DA18C6H2)(pydcH)2_0.25H2O, has been prepared from the reaction between 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane, diaza-18-crown-6 (DA18C6), and 2,6-pyridinedicarboxylic acid, dipicolinic acid (pydcH2). The characterization was performed using 1H and 13C NMR, IR spectroscopy and single crystal X-ray diffraction analysis. The asymmetric unit consists of one (DA18C6H2)2+ cation adopting a sigmoidal conformation which interacts with two (pydcH)- anions via hydrogen bonds involving the protonated amine groups of the diazacrown ether. -COOHźźź-OOC- head-to-tail hydrogen bonds generate 2D undulating layers along [100] and [001] in the crystal lattice. The protonation constants of DA18C6 and pydcH2 and equilibrium constants for the reaction of the two reactants were determined by potentiometric pH titration. The solution studies supported the formation also in solution of (DA18C6H2)(pydcH)2 as the most abundant species at pH = 3.4.