Two new copper(II) complexes based on 4-(1H-1, 2, 4-triazol-1-yl)phenol and different co-ligands: synthesis, crystal structures, luminescent properties and magnetic behavior. Issue 8 (17th April 2020) - Zhao, Hong-Kun
Abstract: Two 4-(1 H -1, 2, 4-triazol-1-yl)phenol (hptrz)-based transition metal complexes with different aromatic polycarboxylic acids as co-ligands, {[Cu2 (H2 O)4 (hptrz)2 (btec)]⋅2H2 O}n (1 ) and [Cu(hptrz)2 (H2 btc)2 ]·H2 O (2 ) (H4 btec = benzene-1, 2, 4, 5-tetracarboxylic acid, H3 btc = benzene-1, 3, 5-tricarboxylic acid), have been obtained, which were structurally characterized by single-crystal X-ray diffraction, elemental analysis, FT-IR spectra, thermogravimetric curves and luminescence spectra in detail. Structural analysis reveals that 1 is a 1-D infinite chain framework extended by btec 4– anions, whereas 2 is isolated centrosymmetric mononuclear entities. In contrast, the neutral hptrz is a terminal ligand to complete the metal coordination sphere and it also helps to assemble the low-dimensional coordination sphere into a high-dimensional supramolecular architecture by O–H···O hydrogen-bonding interactions. Additionally, the high stability and luminescence emission suggest that 1 and 2 are good candidates for light emission materials. The magnetic features of 1 may be due to weak antiferromagnetic coupling between Cu II ions which are separated by btec 4– anions. Graphical Abstract: