Stable cationic coordination polymers of the Cu(II)-vitamin B6 type : Structural analysis, application abilities and physicochemical properties in the solid state and solutions

Małgorzata Ogryzek , Agnieszka Chylewska , Paulina H. Marek , Izabela D. Madura , Lech Chmurzyński , Mariusz Makowski

Abstract

The stability of two cationic coordination polymers, {[Cu(NO3)(pm)2]}nNO3·H2O and {[Cu(Cl)(pn)2]}nNO3 (pm and pn denote pyridoxamine and pyridoxine, respectively), have been investigated in the solid state and solutions. The characterization of the solid precipitates has been acquired by X-ray, FT-IR spectroscopic, elemental analysis and thermogravimetric (27–900 °C) methods. The distorted tetragonal bipyramide geometry of a copper coordination sphere has been found in both compounds. In each case two bidentate vitamin B6 zwitterionic molecules (either pm or pn) are in equatorial positions while the axial ones are occupied by bridging ions (NO3− or Cl−). Interligand hydrogen bonds have been found to stabilize the polymers whereas the packing in crystals results from ionic interactions and charge assisted hydrogen bonding with terminal hydroxyl groups. In Cu-pm crystal lattice water molecules are also involved in the interchain H-bond network. The conductivity measurements and UV–Vis spectroscopy have confirmed the stabilization of the cationic coordination polymers in solutions. The redox properties of the compounds studied has been investigated by using cyclic voltammetry. The acid-base properties in aqueous solutions have been studied and the values of deprotonation constants have been determined by potentiometric and UV–Vis spectroscopic microtitration techniques. Finally, the application of the Cu(II)-vitamin B6 type complexes as sensing materials was proposed.
Author Małgorzata Ogryzek POM
Małgorzata Ogryzek,,
- Laboratory of Intermolecular Interactions
, Agnieszka Chylewska POM
Agnieszka Chylewska,,
- Laboratory of Intermolecular Interactions
, Paulina H. Marek
Paulina H. Marek,,
-
, Izabela D. Madura
Izabela D. Madura,,
-
, Lech Chmurzyński PFZK
Lech Chmurzyński,,
- Laboratory of Physicochemistry of Coordination Complexes
, Mariusz Makowski POM
Mariusz Makowski,,
- Laboratory of Intermolecular Interactions
Journal seriesDyes and Pigments, ISSN 0143-7208
Issue year2017
Vol136
Pages278-291
Publication size in sheets0.65
Keywords in EnglishCu(II) complexes, vitamin B6, X-ray, potentiometry, UV-Vis spectrophotometry
DOIDOI:10.1016/j.dyepig.2016.08.055
URL http://dx.doi.org/10.1016/j.dyepig.2016.08.055
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.473 (2) - 2016=3.417 (5)
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