The cover picture shows a note system starting with a stacked group of three semibreves. These notes symbolize the three phosphorus(V) species
discussed in this paper, namely trifluorophosphates, [R3
, difluorophosphoranes, R3
. As in the periodic table, the heavy homologue bismuth is located on a lower note. Details are discussed
in the article by B. Hoge et al.