I was looking for a way to indicate the point in a molecule where a rotation around a bond would occur. I found some, but I didn't know if they would work on CHEMFIG.
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2If you have already a solution to your problem, ask without including the solution and reply yourself making a separate answer in order to not list it as "unanswered".– FranJul 19, 2020 at 7:34
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1 Answer
So I had an inspiration, and I created a way to do this in CHEMFIG, and it's easy, you don't need to create new commands.
Just create a brand on a bond, and use that brand as the starting and ending point of a arrow. An adjustment in the exit and arrival angles of the arrow creates the desired circular shape.
No new packages, no new commands, no new tools
%=========================================================
\documentclass[margin={12mm 12mm}]{standalone}
\usepackage[utf8x]{inputenc}
\usepackage{chemfig}
\setatomsep{1.8em}
\usetikzlibrary{arrows}
\begin{document}
\schemestart
\chemfig{A-[@a0,3]B}
\qquad
\chemfig{A-[@b1,3]B}
\qquad
\chemfig{A-[@c2,3]B}
\chemmove{\draw[red, shorten <=4pt,shorten >=4pt](a).. controls +(80:16mm) and +(280:16mm)..(a);
\draw[red,shorten <=4pt,shorten >=4pt](b).. controls +(130:16mm) and +(330:16mm)..(b);
\draw[red,shorten <=4pt,shorten >=4pt](c).. controls +(170:14mm) and +(10:14mm)..(c);
}
\schemestop
\end{document}
%================================================
