New Coordination Compounds of CuII with Schiff Base Ligands—Crystal Structure, Thermal, and Spectral Investigations

Crystals

Agata Bartyzel¹  Beata Cristóvão¹  Dariusz Osypiuk¹ 

[1] Department of General and Coordination Chemistry and Crystallography, Faculty of Chemistry, Institute of Chemical Sciences, Maria Curie-Sklodowska University in Lublin, Maria Curie-Sklodowska Sq. 2, 20-031 Lublin, Poland;

关键词: Schiff base;    N,O-donor ligand;    complexes of Cu(II);    crystal structure;    thermal properties;   

DOI  :  10.3390/cryst10111004

来源: DOAJ

【 摘 要 】

The new mono-, di- and tetranuclear coordination compounds [Cu(HL¹)]·H₂O (1), [Cu₂(L¹)(OAc)(MeOH)]·2H₂O·MeOH (2), [Cu₄(L²)₂(OAc)₂]·4MeOH (3), and [Cu₄(L²)₂(OAc)₂]·4H₂O·4MeOH (4) were synthesized by the direct reaction of 2,2′-{(2-hydroxypropane-1,3-diyl)bis[nitrilomethylidene]}bis(4-bromo-6-methoxyphenol) (H₃L¹) or 2,2′-{(2-hydroxypropane-1,3-diyl)bis(nitriloeth-1-yl-1-ylidene)}diphenol (H₃L²) and the Cu(II) salt. They were characterized by elemental analysis, X-ray fluorescence (XRF), Fourier transform infrared (FTIR) spectroscopy, simultaneous thermal analysis and differential scanning calorimetry (TG/DSC), and thermal analysis coupled with Fourier transform infrared spectroscopy (TG-FTIR) techniques and the single crystal X-ray diffraction study. In the dinuclear complex 2, the copper(II) ions are bridged by an alkoxo- and a carboxylato bridges. The tetranuclear complexes 3 and 4 are formed from dinuclear species linkage through the phenoxo oxygen atoms of the fully deprotonated H₃L². Compounds 1–4 are stable at room temperature. During heating in air, at first, the solvent molecules (water and/or methanol) are lost and after that, the organic part undergoes defragmentation and combustion. The final decomposition solid product is CuO. The main gaseous products resulting from the thermal degradation of 1–4 in a nitrogen atmosphere were: H₂O, MeOH, CH₃COOH, CH₄, C₆H₅OH, CO₂, CO, and NH₃.

【 授权许可】

Unknown