Synthesis and characterization of bis(diphenylphosphinomethyl)amino ligands and their Ni(II), Pd(II) complexes: Application to hydrogenation of styrene

✍ Scribed by Mustafa Keleş; Orhan Altan; Osman Serindaǧ

• Publisher: John Wiley and Sons
• Year: 2008
• Tongue: English
• Weight: 213 KB
• Volume: 19
• Category: Article
• ISSN: 1042-7163
• DOI: 10.1002/hc.20384

✦ Synopsis

Abstract

Transition metal complexes of Ni(II) and Pd(II) with ditertiary bis(diphenylphosphinomethyl)amino ligands, (Ph~2~PCH~2~)~2~NC(CH~3~)~3~ (1) and [(Ph~2~PCH~2~)Nm‐PhSO~3~]Na (2) (Ph = phenyl), have been synthesized in good yields under nitrogen atmosphere by Schlenk technique. All complexes have been characterized using elemental analyses and spectroscopic techniques such as atomic absorption, FT‐IR, and NMR (^1^H, ^31^P). Atomic absorption spectroscopic analysis showed that the reactions of ligands 1 and 2 with NiCl~2~ ⋅ 6H~2~O and [PdCl~2~(COD)] occurred in 1:1 molar ratio. The metal complexes [NiCl~2~(Ph~2~PCH~2~)~2~Nm‐PhSO~3~Na] (4) and [PdCl~2~(Ph~2~PCH~2~)~2~Nm‐PhSO~3~Na] (6) were found to be soluble in ethanolic and aqueous solutions, as well as slightly soluble in water. Electrochemical behaviors of complexes were investigated by cyclic voltammetry. Catalytic effects of Pd(II) complexes were tested throughout the hydrogenation of styrene to ethylbenzene. © 2008 Wiley Periodicals, Inc. Heteroatom Chem 19:113–118, 2008; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/hc.20384