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二—(2—乙基己基)膦酸(P_(220))具有双碳磷键结构。与P(204)比较,减少了两个酯氧原子,而P(507)则多一个酯氧原子。它们可用下列符号表示:
Bis (2-ethylhexyl) phosphonic acid (P_ (220)) has a double-carbon phosphorus bond structure. Compared to P (204), two ester oxygen atoms are reduced, while P (507) is one more ester oxygen atom. They can be represented by the following symbols: