Author/Authors :
Natalya Zauzolkova، نويسنده , , Zhanna Dobrokhotova، نويسنده , , Anatoly Lermontov، نويسنده , , Ekaterina Zorina، نويسنده , , Anna Emelina، نويسنده , , Mikhail Bukov، نويسنده , , Vladimir Chernyshev، نويسنده , , Aleksey Sidorov، نويسنده , , Mikhail Kiskin، نويسنده , , Artem Bogomyakov، نويسنده , , Anton Lytvynenko، نويسنده , , Sergey Kolotilov، نويسنده , , Yuriy Velikodnyi، نويسنده , , Maksim Kovba، نويسنده , , Vladimir Novotortsev، نويسنده , , Igor Eremenko، نويسنده ,
Abstract :
The reactions of CuSO4·5H2O, dimethylmalonic acid and Ba(OH)2·H2O (Cu: H2Me2mal: Ba=1: 2: 2) in aqueous and aqueous-ethanol solutions (H2O: EtOH=1: 1) resulted in formation of 3D-porous coordination polymers [(H2O)3(μ-H2O)2CuBa(μ3-Me2mal)(Me2mal)]n (1) and [(μ-H2O)CuBa(μ3-Me2mal)(μ4-Me2mal)]n (2), respectively. It has been shown that compound 2 was an intermediate in the thermal degradation of compound 1. Thorough studies of solid-state thermolysis of 1 and 2 allowed to detect formation of coordination polymer [CuBa(μ4-Me2mal)(μ5-Me2mal)]n (3), structure of which was determined by X-ray powder diffraction. It has been found that the channels in polymer 3 were accessible for guest molecules (MeOH). Theoretical estimation of methanol diffusion barrier was carried out. Complete solid-phase thermolysis of 1 and 2 leads to a mixture of BaCuO2, BaCO3, and CuO. Special conditions for obtaining of a crystalline phase of pure cubic BaCuO2 were determined.
Keywords :
Copper(II)-barium complexes , Porous coordination polymer , Barium cuprate , Thermal behavior , Synthesis , X-ray study
