Exploring the coordination abilities of 1,5-diisopropyl-3-(4′-carboxyphenyl)-6-oxoverdazyl

Publication date: Available online 28 June 2019Source: Comptes Rendus ChimieAuthor(s): Varun Kumar, Sergiu Shova, Ghenadie Novitchi, Cyrille TrainAbstractThe reactivity of 1,5-diisopropyl-3-(4′-carboxyphenyl)-6-oxoverdazyl HIi-Pr toward divalent metal ions is dominated by the coordination of the carboxylate moiety onto the metal ions. The formula of the compound obtained by the reaction with the earth-alkaline magnesium (II) is [Mg(Ii-Pr)2·2H2O]n·0.35H2O (Ii-Pr–Mg) whereas the reaction with 3d divalent metal ions yields compounds of general formula [M(Ii-Pr)2(CH3OH)4] (M = Mn (Ii-Pr–Mn), Co (Ii-Pr–Co), Ni (Ii-Pr–Ni), Zn (Ii-Pr–Zn)). The single-crystal X-ray diffraction analysis of Ii-Pr–Mg reveals that the magnesium (II) adduct forms a one-dimensional (1D) coordination polymer with a terminal radical in a bidentate κ(O,O′) coordination mode and a bridging one in a μ − 1κ(O); 1κ (O′) syn–anti mode. The coordination sphere of the magnesium (II) is completed by two water molecules that established H-bonds with the carboxylate moiety of the terminal radicals that further reinforce the 1D coordination polymer. Adjacent chains interact through π-stacking of head-to-tail radicals. The single-crystal X-ray diffraction analysis of Ii-Pr–Mn and Ii-Pr–Ni reveals that the two compounds are isostructural. They are composed of mononuclear complexes where the divalent metal is surrounded by two radicals coordinated by monodentate carboxylate and four methano...

Source: Comptes Rendus Chimie - June 30, 2019 Category: Chemistry Source Type: research