MS36-P11 Effect of dehydratation on zinc malonate complexes with 1,2-bis(pyridin-4-yl)ethylene Ivan Ushakov (A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Laboratory for X-Ray Diffraction Studies, Moscow, Russia) Alexander Goloveshkin (A.N.Nesmeyanov Institute of Organoelement Compounds of Russian Academy of Sciences, Moscow, Russia) Anna Vologzhanina (A.N Nesmeyanov Institute of Organoelement Compounds, Moscow, Russia) Ekaterina Zorina-Tikhonova (Kurnakov Institute of Inorganic Chemistry, Moscow, Russia) Aleksandr Chistyakov (Kurnakov Institute of Inorganic Chemistry, Moscow, Russia) Aleksei Sidorov (Kurnakov Institute of Inorganic Chemistry, Moscow, Russia) Igor Eremenko (Kurnakov Institute of Inorganic Chemistry, Moscow, Russia)email: f0rbmen@gmail.comRecently we carried out a series of photoinitiated reactions in zinc malonates with bis(pyrid-4-yl)ethylene [1]. The transformation of {[Zn(bpe)(Me2mal)]·H2O}n to {[Zn(bpe)(Me2mal)]2[Zn2(tpcb)(Me2mal)2]·H2O}n (Me2mal = dimethylmalonate, tpcb = 1,1,2,2-tetrakis(pyridine-4-yl)cyclobutane) was proposed to be affected by dehydratation reaction. Thus, we studied the effect of dehydration on above {[Zn(bpe)(Me2mal)]·H2O}n and its isostructural analog {[Zn(bpe)(cbdc)]·H2O}n (cbdc = cyclobutane-1,1-dicarboxylato). Both compounds were heated for 2 hours at 120°C until constant weight and then irradiated with UV for 8 hours. Transformations of crystalline compounds were controlled by means of powder X-ray diffraction (Figure) and 1H NMR. As it follows from Figure, similarly with {[Zn(bpe)(Me2mal)]·H2O}n dehydration of {[Zn(bpe)(cbdc)]·H2O}n to {[Zn(bpe)(cbdc]}n and irradiation of the latter compound can be described as a two-stage solid-state process. Based on our data, irradiation of {[Zn(bpe)(cbdc)]·H2O}n at room temperature seem to be accompanied by dehydration. Analysis of the reaction products is underway now.References:

[1] Ekaterina N. Zorina-Tikhonova et al., (2018) IUCrJ , 5 2052-2525.
Keywords: photoinitiation, complex compounds, X-ray diffraction