Phosphorous III Fluorides

Note that the change in the coupling constant is consistent with the relative amount of s-character in the phosphorous orbital bound to the fluorines. 

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PF3 and other phosphorous (III) fluorides have pyramidal structures, with the F—P—F bond angle for PF3 being 98 °. Thus, all P—F fluorines... 

Phosphor(III)-fluorid und -chlorid-difluorid addieren bei 20° Bis-[trifluormethyl]-chlor-amin zu (Bis- tri-fluormethyl]-amino)-chlor-trifluor- bzw. (Bis-[trifluormethyl]-amino)-dichlor-difluor-phosphoran ... 

Phosphorus (III) fluoride is a fairly stable, colorless gas which is decomposed slowly by water, forming phosphorous acid and hydrogen fluoride. At elevated temperatures, in the presence of silica, it quickly decomposes. It condenses ft —101.1° to form a colorless, mobile liquid and solidifies at — 151.5° to a white solid. 

Fluoride Drainage water from water treatment plant Distillation UV—Vis 0.05—15 mg L 1 Flow injection system sulphuric and phosphoric acids for sample acidification determination relies on the La(III)—fluoride—alizarin complex. [311]... 

The yellow colour disappears if phosphoric acid or potassium fluoride is added they form colourless complexes with iron(III). 

Carl Wilhelm Scheele (1742-1786) was another phenomenal chemist of the phlogistic era. He was actually the first discoverer of oxygen (1772-1774), on which he first published in 1777. He made other important discoveries including (i) chlorine and manganese, (ii) silicon fluoride and hydrofluoric acid from fluorspar, (iii) phosphorus from bone ash, phosphoric acid from the action of nitric acid on phosphorus, (iv) arsenic acid, molybydic acid, tungstic acid, arsenic... 

In 13 M NH4F, Am(iv) autoreduces at a rate of about 4% per hour [140], increasing to 10% per hour in 3 m fluoride solution [261]. Self-reduction of Am(iv) to Am(iii) in phosphoric acid solution follows first-order reaction kinetics [261-263]. 

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