Adding dipole moments in chemfig

This is more of a comment than an answer but I use the tikz arrow |-> to overcome my issue. It's not exactly what I want but gets me out of a bind for the moment.

documentclass{minimal}
usepackage{chemfig}
usepackage{tikz}
begin{document}
chemfig{
        chemabove[3pt]{C}{scriptstyledelta -}(-[::270,0.5,,,draw=none]@{a})-
        chemabove[3pt]{H}{scriptstyledelta +}(-[::270,0.5,,,draw=none]@{b})
        }
chemmove{
          draw[|->, very thick] (b)--(a);
         } 
qquad
chemfig{
         chemabove[3pt]{O}{scriptstyledelta -}(-[::270,0.5,,,draw=none]@{c})-
         chemabove[3pt]{H}{scriptstyledelta +}(-[::270,0.5,,,draw=none]@{d})
        }
chemmove{
          draw[|->, very thick] (d)--(c);
          }
end{document}

Create a command called name bond as such :

newcommandnamebond[4][5pt]{chemmove{path(#2)--(#3)node[midway,sloped,yshift=#1]{#4};}}

Then you can just use textcomp to implement a normal rightarrow.

usepackage{textcomp}

chemfig{@{a}H-[1]@{b}chemabove{N}{uparrow}(<[6]@{c}H)-[7]@{d}H} 

namebond{a}{b}{textrightarrow}
namebond{c}{b}{textrightarrow}
namebond{d}{b}{textleftarrow}

I use the following code:

scalebox{1.25}{
chemfig{C(-[:90]H(-[::270,0.5,,,draw=none]@{e}))
(-[:-150]H(-[::270,0.25,,,draw=none]@{c}))
(-[:-100]H(-[::90,0.60,,,draw=none]@{g}))
(-[:-30]H(-[::52,0.75,,,draw=none]@{a}))
(-[::-30,0.5,,,draw=none]@{h})
(-[::30,0.6,,,draw=none]@{f})
(-[::105,0.25,,,draw=none]@{d})
(-[::15,0.75,,,draw=none]@{b})
(-[::0,2.5,,,draw=none]@{j})}}
chemmove{
      draw[|->, very thick] (a)--(b);
      draw[|->, very thick] (c)--(d);
      draw[|->, very thick] (e)--(f);
      draw[|->, very thick] (g)--(h);
      node at (j) {$mu = 0$};
     }
qquad
scalebox{1.25}{
chemfig{@{x1}lewis{2:,N}
(-[:-150]H(-[::270,0.25,,,draw=none]@{c}))
(-[:-100]H(-[::90,0.60,,,draw=none]@{g}))
(-[:-30]H(-[::52,0.75,,,draw=none]@{a})
(-[::0,1.25,,,draw=none]@{e}))
(-[::-30,0.5,,,draw=none]@{h})
(-[::105,0.25,,,draw=none]@{d})
(-[::15,0.75,,,draw=none]@{b})
(-[::0,2,,,draw=none]@{f})}}
chemmove{
      draw[|->, very thick] (a)--(b);
      draw[|->, very thick] (c)--(d);
      draw[|->, very thick] (g)--(h);
      draw[|->, very thick] (e)--++(90:1.25) node [midway, right] {$mu > 0$};
     }
qquad
scalebox{1.25}{
chemfig{O(-[:210]H(-[::270,0.25,,,draw=none]@{c}))
(-[:-30]H(-[::52,0.75,,,draw=none]@{a})
(-[::0,1.25,,,draw=none]@{e}))
(-[::30,0.75,,,draw=none]@{b})
(-[::105,0.25,,,draw=none]@{d})
(-[::0,2,,,draw=none]@{f})}}
chemmove{
      draw[|->, very thick] (a)--(b);
      draw[|->, very thick] (c)--(d);
      draw[|->, very thick] (e)--++(90:1.25) node [midway, right] {$mu > 0$};
     }