83679-04-3

Basic information

• Product Name: {PH(C₆H₅)3}⁽¹⁺⁾*FeCl₄^(1-) = {PH(C₆H₅)3}{FeCl₄}
• CAS NO: 83679-04-3
• Molecular Weight: 460.958
• Mol File: 83679-04-3.mol
• Article Data: 2

Chemical Properties

• CAS DataBase Reference: {PH(C₆H₅)3}⁽¹⁺⁾*FeCl₄^(1-) = {PH(C₆H₅)3}{FeCl₄}(CAS DataBase Reference)
• NIST Chemistry Reference: {PH(C₆H₅)3}⁽¹⁺⁾*FeCl₄^(1-) = {PH(C₆H₅)3}{FeCl₄}(83679-04-3)
• EPA Substance Registry System: {PH(C₆H₅)3}⁽¹⁺⁾*FeCl₄^(1-) = {PH(C₆H₅)3}{FeCl₄}(83679-04-3)

Safety Data

• Hazardous Substances Data: 83679-04-3(Hazardous Substances Data)

Upstream product

• 21144-09-2 FeCl₃(P(C₆H₅)3) 
• 16950-17-7 tetrachloroferrate(III) acid 
• 15647-89-9 triphenylphosphine hydrochloride 

Relevant articles and documents

FeCl3-phosphine adducts with trigonal-bipyramidal geometry. Influence of the phosphine on the spin state

Anhydrous FeCl interacts with phosphine ligands in various solvents and in various molar ratios to afford the adducts FeCl3(PR3)n (R = Ph, c-C6H11, n = 1, 2; R = Me, n = 1-3). The 1:1 adducts could only be characterized by low-temperature EPR spectroscopy. They are high-spin (S = 5/2) mononuclear compounds with a tetrahedral geometry. They decompose in aromatic hydrocarbons and halogenated hydrocarbons by complex pathways, including oxidation of the solvent C-H bonds. The 1:2 adducts were isolated and fully characterized. The PPh3 and PMe3 adducts were also characterized crystallographically. FeCl3(PPh3)2: orthorhombic, space group Pbca, a = 17.934 (2) ?, b = 17.075 (3) ?, c = 22.403 (3) ?, V = 6860 (3) ?3, Z = 8, dc = 1.33 g·cm-3, μ(Cu Kα) = 67.90 cm-1, R = 0.066, Rw = 0.066 for 199 parameters and 1916 observations with Fo2 > 3σ(Fo2). FeCl3(PMe3)2: orthorhombic, space group Pnma, a = 9.846 (2) ?, b = 10.680 (3) ?, c = 13.439 (7) ?, V = 1413 (1) ?3, Z = 4, dc = 1.48 g·cm-3, μ(Cu Kα) = 156.99 cm-1, R = 0.053, Rw = 0.066 for 64 parameters and 558 observations with Fo2 > 3σ(Fo2). Both compounds show a trigonal-bipyramidal structure with the two phosphine ligands in the axial positions. All bond parameters are comparable with the notable exception of the Fe-P bond lengths, which are (average) 2.64 ? in the PPh3 and 2.335 ? in the PMe3 derivative. Other properties of these compounds also differ: FeCl3(PPh3)2 is a high-spin (S = 5/2) compound, as shown by magnetic susceptibility and EPR studies. FeCl3(PMe3)2 is EPR silent at liquid-nitrogen temperature and shows a temperature-dependent magnetic moment in solution, consistent with an equilibrium between S = 5/2 and S = 3/2 spin states, the latter being the ground state. A temperature-independent (in the 10-300 K range) magnetic susceptibility corresponding to three unpaired electrons is observed in the solid state. FeCl3(PMe3)3 can only be obtained in equilibrium with the 1:2 adduct in the presence of a large excess of PMe3. Its EPR spectrum is consistent with a low-spin (S = 1/2) state and an octahedral coordination geometry with a meridional configuration. Visible spectroscopic properties and a qualitative MO diagram for these species are also discussed.