How to write reactions spanning more lines?

Question

I would like to insert a few reactions in my latex document which need to be on more lines, similarly to the reactions shown below.

What is the easiest way to achieve this? Up to now I only wrote very single reactions using \ce{} into equations environment. Is there an easy extension to that?

Answer 1

You might want to have a look at the chemfig package, particularly at its scheming commands. For details see the chemfig manual, especially part V Reaction Schemes. Below is an example of its usage:

\documentclass{article}
\usepackage{chemfig,amsmath}

\begin{document}

\schemestart
 E\phantom{I}
 \arrow{<=>[S][$K_S$]}
 ES\phantom{I}
 \arrow{<=>[*0I][*0$K_{ii}$]}[-90]
 EIS
 \arrow{<=>[S][$K_{SS}$]}[180]
 EI
 \arrow{<=>[*0$K_i$][*0I]}[90]
 \arrow(@c2--){->[$k_{\text{cat}}$]}
 E \+ P
 \arrow(@c3--){->[$k_0$]}
 EI \+ P
\schemestop

\end{document}