Polyphosphinic structural isomer

In addition to structural isomers, stereoisomeric and, recently, rotational isomeric polyphosphonic and polyphosphinic acids can be separated. Most intriguing in this connection is the chromatogram in Fig. 3-103 of the sterically-crowded polyphosphonic acid 10,... 

Although some of the more complex polyphosphines have been made, their separation and isolation in pure form has not yet been achieved. Many are yellow or colourless liquids which are frequently difficult to crystallise. As the number of P atoms increases, the likelihood of structural isomers increases. 

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See also in sourсe #XX -- [ ]

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