Ruthenium(II) complexes bearing tridentate 2-(methylsulfoxide)-phenylsalicylaldimine Schiff-base ligands

• Published in: Inorganica Chimica Acta 2025-01, Vol.574, p.122373, Article 122373
• Main Authors: Zhu, Ya-Meng, Lu, Dan-Dan, Zhang, Zhi-Cui, Jia, Ai-Quan, Zhang, Qian-Feng
• Format: Article
• Language: English
• Subjects: Crystal structure; Ruthenium(II); Schiff base; Sulfoxide; Synthesis
• ISSN: 0020-1693
• DOI: 10.1016/j.ica.2024.122373

[Display omitted] •Five ruthenium(II) complexes with sulfoxide-containing Schiff base ligands were synthesized.•The prepared new mononuclear ruthenium complexes were characterized by X-ray crystallography.•The ruthenium(II) complexes could efficiently catalyze cyclopropanation of styrene. The sulfoxide-containing Schiff base (E)-2-((2-(methylsulfinylphenyl)imino) methyl) phenol (HL) was synthesized by aldolamine condensation and oxidation. In the presence of triethylamine, equal amounts of [RuCl2(CO)2]n, [RuHCl(CO)(PPh3)3], cis-[RuCl2(dmso)4] (dmso = dimethylsulfoxide) and [RuCl2(PPh3)3] were reacted with HL to give the ruthenium(II) complexes [RuCl(L)(CO)2] (1), [RuCl(L)(CO)(PPh3)] (2), [RuCl(L)(dmso)2] (3), and [RuCl(L)(PPh3)2] (4), respectively. Compound 4 converted to be [RuCl(L)(PPh3)(CH3CN)] (4′) by recrystallization in acetonitrile. The structures of HL, 1, 2, 3 and 4′ have been confirmed by single crystal X-ray crystallography. In addition, the UV–visible, infrared and fluorescence spectra of HL and its ruthenium complexes 1–4 along with their electrochemical properties were investigated. The catalytic properties of complexes 1–4 for the cyclopropylation of styrene were also presented.