A novel Co(II) porous coordination layer: synthesis, structure and thermal analysis
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VITIU (BOLDIŞOR), Aliona, CROITOR, Lilia, PETUHOV, Oleg, KOROPCHANU, E., BOUROSH, Pavlina. A novel Co(II) porous coordination layer: synthesis, structure and thermal analysis. In: Central and Eastern European Conference on Thermal Analysis and Calorimetry: and 14th Mediterranean Conference on Calorimetry and Thermal Analysis, Ed. 5, 28-31 august 2017, Chişinău. Roma, Italy: Academica Greifswald, 2019, Editia 5, p. 313. ISBN 978-3-940237-59-0.
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Central and Eastern European Conference on Thermal Analysis and Calorimetry
Editia 5, 2019
Conferința "Central and Eastern European Conference on Thermal Analysis and Calorimetry"
5, Chişinău, Moldova, 28-31 august 2017

A novel Co(II) porous coordination layer: synthesis, structure and thermal analysis

CZU: 547.1:546

Pag. 313-313

Vitiu (Boldişor) Aliona12, Croitor Lilia1, Petuhov Oleg2, Koropchanu E.23, Bourosh Pavlina1
 
1 Institute of Applied Physics,
2 Institute of Chemistry,
3 Tiraspol State University
 
Disponibil în IBN: 9 iunie 2020


Rezumat

The design of porous coordination polymers (PCPs) that show selective adsorption or high adsorption capacity is an important topic in research on applicable porous materials. 2,2'- Dithiodibenzoic acid (H2dtdb) is a multifunctional ligand containing two carboxylic groups and two thio donor atoms, which may coordinate to the metal ions by diverse modes, and allow of different coordination polymer topologies. The twisted binding site of the S ̶ S bond makes the ligand flexible and in combination with 1,2-bipyridine ethane (bpe) spacer and Co(II) salt gave us the opportunity to obtain new PCP: {[Co4(Htb)4(tb)2(bpe)(H2O)2]·2(dmf)·9(H2O)}n (1). Surprisingly, H2dtdb was split into two molecules after cleavage of S–S bond forming the thiobenzoate ligand (tb‒ ). Figure 1. Fragment of 2D layer (a) and TG-DTA pattern of 1(b) The compound crystallizes in centrosymmetric triclinic space group P-1: a= 10.3970(4), b= 13.7039(5), c= 13.7672(7) Å, α= 66.058(4), β= 88.257(4), γ= 75.025(3)°, V=1725.71(13) Å3 . Compound 1 is a three-dimensional polymer that could be used to adsorb small molecules and also, shows a theoretical interest because it contains a high number of molecules of water and dmf, which can be removed by degassing and track the changes in porosity and structure. To determine the adsorption properties, it is necessary to know the temperature at which the structure of the compound remains unchanged and its thermal behavior. For this, the simultaneous thermal analysis was used, figure 1b. Received results gave us information about thermal stability and temperatures of reactions during the heating in the wide temperature ranges. Due to the high solvent content in the external sphere, compound 1 begins to lose weight once the heated is start. Up to 240 oC, the sample loses all water and dmf molecules. Using the obtained data, compound 1 was degassed at three different temperatures: 20, 120 and 150 oC, after which the adsorption isotherms of nitrogen were measured. The influence of degassing temperature on the adsorption properties will be presented and discussed.