Jahn–Teller distortion in 2-pyridyl-(1,2,3)-triazole-containing copper(ii) compounds

Abstract

Octahedral copper(ii) compounds, containing two 2-pyridyl-(1,2,3)-triazole ligands as well as two Cl ions, exhibit elongation Jahn–Teller distortion.

Unusual Effect of Impurities on the Spectral Characterization of 1,2,3-Triazoles Synthesized by the Cu-Catalyzed Azide–Alkyne Click Reaction

“…According to the Cambridge structural database (CSD, version 2020.3.0), copper complexes bearing 1,2,3-triazole ligands are well known with >230 structures reported (upon exclusion of duplicate records). The Cu­(I) − and Cu­(II) − complexes are nearly equally distributed among the found structures. These complexes predominantly demonstrate that a ligand is coordinated to Cu by its third position, but in 19 complexes, ligands are bound via the second position, and 34 complexes display coordination by two nitrogen atoms at the second and third positions.…”

A new square pyramidal copper(II) complex [Cu(C10H24N4)Br]Br: Crystal structure, thermal analysis, Hirschfeld surfaces, electrical and semiconducting properties

“…The Br1 occupies the apical pyramidal position at 2.6028 (6) Å and a deviation of Cu(II) from the basal plane of 0.396 Å. This axial elongation is due to Jahn-Teller effect characteristic of Cu(II) complexes [53,54]. The Cu-N bond lengths are relatively insensitive to ring strain and/or alkyl substitution on the aliphatic linear tetradentate amines.…”

Iodine(iii)-promoted regioselective and efficient synthesis of β-triazolyl BODIPYs for the selective recognition of nickel ions and bovine serum albumin

“…In a recent study, the most stable structure of the 2-pyridyl-(1,2,3)-triazole-copper complex was found to display elongation distortion along the opposite Cu–N(triazole) bonds. 37 Ni( ii ) may also form a hexa-coordinated complex without any Jahn Teller distortion 32 and, therefore, can account for the higher binding constant value with 5d . The results indicate that 5d can act as a dual sensor for both Cu 2+ and Ni 2+ ions.…”