Synthesis, X-ray characterization and study of new ionic complexes of 2-pyridone, obtained by oxidation with I-2
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Antoniadis, C. D.
Hadjikakou, S. K.
Hadjiliadis, N.
Kubicki, M.
Butler, I. S.
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Royal Society of Chemistry
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peer reviewed
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New Journal of Chemistry
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The reaction of 2-pyridone (C5H5NO or PYOH) with diiodine in molar ratios of 2 : 1 and 1 : 2 resulted in the formation of complexes {[(PYOH)(3)(PYOH)(+)]center dot I-3(-)} (1) and {{(PYOH)(6)center dot[(PYOH)(2)](2+)}center dot 0.5I(-)center dot 1.5I(7)(-)center dot I-2} (2), respectively. The reactions were carried out in dichloromethane solutions in air. The compounds were characterized by elemental analysis, DTA-TGA chromatography, FT-Raman, FT-IR, UV-vis and EPR spectroscopies. Crystal structures of the named complexes have been determined by X-ray diffraction at 120(1) K (1) and 293(2) K (2). Compound 1, [(C20H20N4O4)I-3], monoclinic, space group C2/c, consists of a cationic PYOH+ radical species and an I-3(-) counter anion; three neutral PYOH molecules are also bound to the complex. The crystal structure of [(C40H40N8O8)I-13] (2) reveals a centrosymmetric P-1 triclinic space group containing two cationic PYOH+ species, with the anionic counterparts being one half I- and three halves I-7(-). Also, a neutral diiodine molecule I-2 is retained by weak halogen-halogen interactions to I-, as well as six neutral PYOH ligands. The structures of 1 and 2 consist of hydrogen-bonded pyridine layers; polyiodide fragments fill the spaces between the layers, additionally kept together by a number of weak C-H center dot center dot center dot I interactions.
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charge-transfer complexes, crystal-structures, molecular-complexes, polyiodide salts, pressure superconductivity, electrical-properties, chemical oxidation, antithyroid drugs, diiodine adducts, ft-raman
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<Go to ISI>://000228744800011
http://pubs.rsc.org/en/content/articlepdf/2005/nj/b417828a
http://pubs.rsc.org/en/content/articlepdf/2005/nj/b417828a
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en
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Πανεπιστήμιο Ιωαννίνων. Σχολή Θετικών Επιστημών. Τμήμα Χημείας