Crystal and molecular structure of tetra(triphenylphosphine oxide) sodium hexafluorophosphate

The complex compound of [Na(OPPh 3 ) 4 ]PF 6 formula was obtained in the reaction of triphenylphosphine oxide (OPPh 3 ) with sodium hexafluorophosphate (NaPF 6 ) in dichloromethane (CH 2 Cl 2 ). The slow crystallization at roomtemperature produced crystals suitable for X-ray analysis. Crystals are triclinic, space group P1 with a = 12.035(3), b = 14.268(3), c = 19.397(4) A, α = 72.72(2), β = 89.14(2), γ = 88.29(2)°, V = 3178.9(12) A 3 and Z = 2 at 100 K. The sodium cation is surrounded by four oxygen atoms of OPPh 3 ligands in a tetrahedral fashion. The slight difference of Na-O distances (2.207(2)-2.239(2) A) as well as remarkable difference of P-O-Na angles (137.37(7)-172.55(9)°) found in [Na(OPPh 3 ) 4 ] + cation are explained by formation of intramolecular C-H...O interactions as well as intermolecular interactions of C-H...F type between phenyl rings and fluorins of PF - 6 .