Synthesis and characterization of catalytically active Ni(II) complexes with bis(phenol)diamine ligands

Jafari, Zahra (avtor), Safaei, Elham (avtor), Wojtczak, Andrzej (avtor), Zeinalipour-Yazdi, Constantinos D. (avtor), Kozlevčar, Bojan (avtor), Jagličić, Zvonko (avtor)

A novel N,N’-dimethylethylenediamine derivative of substituted bis(phenol)diamine ligands, namely 2-(tert-butyl)-4-methylphenol in H$_2$L$^1$, was synthesized by a convenient green procedure. Nickel)II) complex [NiL$^1$] 1 has been synthesized and characterized by various methods along with crystal structure determined. Ni(II) coordination center in a mononuclear complex is surrounded by two phenolate oxygen atoms and two amine nitrogen atoms of the ligand in a square planar arrangement. The magnetic susceptibility of the title complex indicates a paramagnetic behavior above 150 K, while strong ferromagnetism below 100 K. Furthermore, the cyclic voltammetry studies show two ligand-centered oxidation of the phenolate groups to phenoxyl radical and the metal-centered reduction of Ni(II) to Ni(0). The Glaser coupling reaction of phenylacetylene was also studied. A strong catalytic activity at room T in THF solvent is observed for 1 in the presence of zinc powder as a reducing agent. A full conversion rate was achieved after 7 h at 25 °C. The DFT analysis corroborates with the square-planar NiO$_2$N$_2$ chromophore of 1 being reduced in catalytically active Ni(0) by applied Zn. The calculated Gibbs free energy of the reaction leading to the formation of the substrate Ni-complex is favorable endothermic. Most of the data for 1 were obtained also for the very similar previously reported [NiL$^2$] 2, with 2,4- di tert-butylphenol in H$_2$L$^2$, which were than compared.

• Jezik: Angleški jezik
• Ključne besede: bisphenoldiamine, nickel complexes, Glaser reaction, coupling of phenylacetylene, ferromagnetism, green procedure
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FKKT - Fakulteta za kemijo in kemijsko tehnologijo ; FGG - Fakulteta za gradbeništvo in geodezijo
• Status publikacije: Objavljeno
• Različica publikacije: Recenzirani rokopis
• Leto izida: 2025
• Št. strani: 8 str.
• Številčenje: Vol. 574, art. 122353
• PID: 20.500.12556/RUL-161611
• UDK: 546.742:547.415.1
• ISSN pri članku: 0020-1693
• DOI: 10.1016/j.ica.2024.122353
• COBISS.SI-ID: 207250179
• Datum objave v RUL: 12.09.2024

Gradivo je del revije

• Naslov: Inorganica Chimica Acta
• Skrajšan naslov: Inorg. Chim. Acta
• Založnik: Elsevier
• ISSN: 0020-1693
• COBISS.SI-ID: 25620736

Licence

• Licenca: CC BY-NC-ND 4.0, Creative Commons Priznanje avtorstva-Nekomercialno-Brez predelav 4.0 Mednarodna
• Povezava: http://creativecommons.org/licenses/by-nc-nd/4.0/deed.sl
• Opis: Najbolj omejujoča licenca Creative Commons. Uporabniki lahko prenesejo in delijo delo v nekomercialne namene in ga ne smejo uporabiti za nobene druge namene.

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: bisfenoldiamini, nikljevi kompleksi, Glaserjeva reakcija, sklopitev fenilacetilena, feromagnetizem, zeleni postopek