Thermal behavior of inosine 5′-monophosphate complexes with cobalt(II), nickel(II), copper(II) and cadmium(II) cations

Add time:09/26/2019    Source:sciencedirect.com

Interaction of nucleotides and metals has been largely studied since they have biological importance. Divalent complexes of inosine 5'-monophosphate with cobalt(II) (IMP-Co), nickel(II) (IMP-Ni), copper(II) (IMP-Cu) and cadmium(II) (IMP-Cd) have been characterized by elemental analysis and submitted to thermogravimetry (TG), differential thermal analysis (DTA), differential scanning calorimetry (DSC) and thermogravimetry coupled to infrared spectroscopy (TG-FTIR). Cadmium(II) complex with inosine 5′-monophosphate had also its crystalline structure elucidated by single-crystal X-ray diffraction. Elemental analysis revealed that the isolated metal complexes presented a 1:1 stoichiometry. The thermal stability order was: IMP-Co (193 °C) = IMP-Cd (193 °C) < IMP-Ni (206 °C) < IMP-Cu (219 °C), after dehydration. Cd2+ ions present octahedral coordination with an IMP ligand through nitrogen donor atom and the remaining coordinating sites through five water molecules. The crystal packing assembly has a similar distribution to the DNA molecule, with alternation between the atoms leading to a helical conformation.

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