Radical Ion 1 Hexafluoroarsenate

TETRABUTYLAMMONIUM HEXAFLUOROARSENATE AND BIS(4,4, 5,5 -TETRAMETHYL-2,2 -BI-l,3-DISELENOLYLIDENE) RADICAL ION (1 + ) HEXAFLUOROARSENATE 

Submitted by STEVE COMPTON, HAU H. WANG.t and JACK M. WlLLIAMSt Checked by MARSHA M. LEEi  

Initially, 3.97 g of potassium hexafluoroarsenate (17.4 mmol) in 36 mL of distilled water is added slowly to 140 mL of an aqueous solution that contains 6.42 g of tetrabutylammonium iodide [Alfa Inorganics] (17.4 mmol) at 60°. A pale yellow precipitate of tetrabutylammonium hexafluoroarsenate forms immediately. The mixture is stirred for 10 min and then allowed to cool to room temperature. The precipitate is removed by filtration and is washed with five 10-mL portions of distilled water. The crude product is recrystallized twice fix)m hot methanol. The yield is 5.77 g of white needles of [CH3(CH2)3]4N[AsFJ (13.4 mmol, 80%) (mp 245-248°). 

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