Abstract
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.
Highlights
Crystals 2020, 10, 1004 nitrogen atoms of one Schiff base and occasionally, additional donor atoms derived from other molecules are present
We report the crystal structures, thermal, and spectral properties of four new complexes.In In research, we used two Schiff as ligands that differed in the Schiff base thethe research, we used two Schiff bases bases as ligands that differed in the amount
The Fourier-transform infrared spectroscopy (FTIR) (4000–400 cm−1 ) of 1, 2, and H3 L1 was performed on a M–80 spectrophotometer Carl Zeiss Jena using KBr pellets
Summary
The interest in the N,O-donor Schiff bases in the field of coordination chemistry has increased over the last several years because they can form stable coordination compounds with most transition metals [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21] These types of ligands and their complexes show interesting properties that can be potentially used in various fields such as catalysis [7,8,9], analytical chemistry [10,11], magnetic [5,6,12,13,14,15], and photoluminescence materials [4,16,17,18,19], etc. The coordination environment of the metal ion consists of two oxygen and two nitrogen atoms of one Schiff base and occasionally, additional donor atoms derived from other molecules
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