Investigation of thermal behaviour of Zn(II) malonate coordination polymers with nicotinamide-like pillars

Chişca Diana; Croitor Lilia; Coropceanu Eduard; Petuhov Oleg; Fonari Marina

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CHIŞCA, Diana, CROITOR, Lilia, COROPCEANU, Eduard, PETUHOV, Oleg, FONARI, Marina. Investigation of thermal behaviour of Zn(II) malonate coordination polymers with nicotinamide-like pillars. In: Central and Eastern European Conference on Thermal Analysis and Calorimetry, Ed. 4, 28-31 august 2017, Chişinău. Germany: Academica Greifswald, 2017, Editia 4, p. 411. ISBN 978-3-940237-47-7.

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Central and Eastern European Conference on Thermal Analysis and Calorimetry
Editia 4, 2017

Conferința "Central and Eastern European Conference"
4, Chişinău, Moldova, 28-31 august 2017

Investigation of thermal behaviour of Zn(II) malonate coordination polymers with nicotinamide-like pillars

Pag. 411-411

Chişca Diana¹, Croitor Lilia¹, Coropceanu Eduard²³, Petuhov Oleg², Fonari Marina¹

¹ Institute of Applied Physics, Academy of Sciences of Moldova,
² Institute of Chemistry of the Academy of Sciences of Moldova,
³ Tiraspol State University

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Menționat în lucrare: 17.80012.02.05F Designul, prepararea și studiul materialelor metalorganice în baza metalelor de tranziție și liganzilor micști și polidentați cu proprietăți utile

Disponibil în IBN: 23 octombrie 2019

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The rational construction of coordination polymers (CPs), normally existing as infinite crystalline lattices extended from inorganic vertices and organic struts, essentially benefits from the development of crystal engineering strategies. Herein we report the thermogravimetric behaviour of three bidimensional (2D) zinc(II) CPs with composition {[Zn(mal)(nia)(H2O)]·dmf}n (1), {[Zn(mal)(S-nia)(H2O)]·dmf}n (2) and {[Zn(mal)(izo-nia)(H2O)]·dmf}n (3) (where H2mal=malonic acid, nia=nicotinamide, izo-nia=isonicotinamide, S-nia=thionicotinamide, dmf=N,N'-dimethylformamide), and discuss the influence of the nicotinamidelike ligands on their stability. All compounds were subjected to the combined thermal analysis TG/DTG/DTA in the temperature range of 20-1020 oC, to evaluate the areas of their thermal stability. Up to 195 oC all compounds are losing a water and dmf molecule, the processes being accompanied by endothermic effects. The thermic degradation of 1 and 3 go in the same way, with minimal differences being noted in the decomposition steps: initial removing a formamide molecule from the nicotinamide ligands, then decarboxylation of malonic acid takes place. The decomposition of 2 goes differently: initially the decarboxylation of malonic acid occurs followed by the oxidation of thionicotinamide. As a result, ZnS is formed, which in the presence of oxygen from the air passes in ZnSO4 and the process results in a mass increasing. The thermic analysis of the zinc(II) malonate CPs with nicotinamide-like ligands have indicated a similarity in the decomposition processes of complexes containing nicotinamide and isonicotinamide, at the same time, the thionicotinamide ligand degrades thermally at a higher temperature, indicating a more pronounced thermal stability.

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