Synthesis, crystal structures and magnetic properties of two iron (II) tris(pyridyl)phosphine selenides complexes

ABSTRACT

We reported the synthesis of tris(pyridyl)phosphine selenide (TppSe) and tris(4-methylpyridin-2-yl)phosphine selenide (MeTppSe), which were prepared by a simple and straightforward one-pot method with red phosphorus in a KOH/DMSO suspension, and treatment of resulted phosphines with selenium in hot toluene. These compounds were characterized by mass spectroscopy, ¹H, ¹³C and ³¹P NMR spectroscopies and the structure of MeTppSe was characterised by a single-crystal X-ray diffraction. Furthermore, The reactions of selenides with Fe(ClO₄)₂·6H₂O afforded two new iron(II) mononuclear metal complexes [Fe(TppSe)₂][ClO₄]₂·3DMF (1) and [Fe(MeTppSe)₂][ClO₄]₂·2DMF (2). Detailed structural analyses and magnetic susceptibility measurements confirm no spin transition from low-spin to the high-spin state between 2 and 300 K in two iron(II) complexes.

GRAPHICAL ABSTRACT

KEYWORDS:

• Selenide
• Iron(II) mononuclear metal complexes
• magnetic
• spin transition

Additional information

Funding

Educational Commission of Hubei Province of China (No. B2017141). The National Undergraduate Training Program for Innovation and Entrepreneurship (No. 201613256001). The open fund of Hubei Key Laboratory of Pollutant Analysis & Reuse Technology (No. PA160209). The key fund of The School of Art and Science of Hubei Normal University (No. Ky201701).