Thermal behaviour and optical properties of a new dimeric 1D mixed halide hybrid material [CuBrCl(C2H8N2)]

• Published in: Inorganic chemistry communications 2022-08, Vol.142, p.109654, Article 109654
• Main Authors: Abid Derbel, Marwa, Nasr, Samia, Naïli, Houcine, Rekik, Walid
• Format: Article
• Language: English
• Subjects: 1D crystal structure; Hybrid material; Octahedral coordination; Semi conductors; Thermal decomposition
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/j.inoche.2022.109654

[Display omitted] •The partial substitution of bromine by chlorine allowed to obtain a one-dimensional material while the pure chlorine and bomine compounds are supramolecular and modified the role of the organic part which passes from a counter ion in pure bromine or chlorine compounds to a chelating bidentate ligand in the mixed complex.•Thethermogravimetric analysis indicates that the precursor decomposes in two stages giving rise to the copper oxide CuO as final residue.•The new compound is characterized by band gap energy of 2.92 eV so it can be classified as semiconductor material which is of preeminent importance for the optoelectronics applications. A new organic–inorganic copper-based hybrid material containing ethylendiamine as organic part and mixed bromide/chloride as halide ions has been synthesized and crystallographically characterized. At room temperature, this new compound adopts the monoclinic symmetry (space group P21/m) and presents the following unit-cell parameters: a = 6.927(3) Å, b = 5.884(3) Å, c = 8.399(4) Å, β = 94.856(13)°, V = 341.1(2)Å3 and Z = 2. The 1D structure of the title compound consists of infinite dimeric chains running along the crystallographic b axis. These chains are constructed from dimeric units [Cu2Br2Cl2(C2H8N2)2] linked together by sharing (Br/Cl) atoms. N-H…Br/Cl hydrogen bonds guarantee the connection between the dimeric chains and the cohesion of the structure. The thermogravimetric analysis shows that this new hybrid material decomposes in two stages giving rise to the copper oxide as final residue. The UV–visible absorption shows that the new complex undergoes three optical absorption bands at 238, 317 and 686 nm, respectively. From the gap energy value of 2.92 eV it can be concluded that the new mixed halide compound is a semiconductor material.