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

Abstract

Two 4-(1H-1,2,4-triazol-1-yl)phenol (hptrz)-based transition metal complexes with different aromatic polycarboxylic acids as co-ligands, {[Cu₂(H₂O)₄(hptrz)₂(btec)]⋅2H₂O}_n (1) and [Cu(hptrz)₂ (H₂btc)₂]·H₂O (2) (H₄btec = benzene-1,2,4,5-tetracarboxylic acid, H₃btc = 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

Keywords:

• 4-(1H-1,2,4-Triazol-1-yl)phenol
• copper(II)complexes
• co-ligand
• hydrogen bond
• luminescent property
• magnetic behavior

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This present work was financially supported by the National Natural Science Foundation of China [grants 21671149, 21571140 and 21531005], which are gratefully acknowledged.