Align FrameLabel Right

You could use Labeled outside of the Graphics object. For example:

Labeled[
    Graphics[{}, Frame->True], 
    {"vertical label", "horizontal label"},
    {{Left, Top}, {Bottom, Right}},
    RotateLabel -> True
]

Plot[Exp[z], {z, 0.32, 1},
 PlotRange -> {All, All},
 Frame -> True,
 GridLines -> Automatic,
 LabelStyle -> {Black, 19},
 Axes -> False,
 FrameLabel -> {
   Row[{Spacer@180, "Distance (nm)"}],
   Row[{Spacer@50, "Potencial  (Nm)"}]}]