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\documentclass[12pt]{article} 
\usepackage{amstext, amsmath}
\usepackage{chemarrow}

\begin{document}
\let\rightarrow\chemarrow
Begin $\xrightarrow[\text{Text below the arrow}\footnote{this is footnote}]{\text{Text above the arrow}}$ end
\end{document}

It shows the footnote number but does not actually show the footnote at the bottom

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1 Answer 1

up vote 9 down vote accepted

use \footnotemark and \footnotetext

\documentclass[12pt]{article} 
\usepackage{amstext, amsmath}
\usepackage{chemarrow}

\begin{document}
\let\rightarrow\chemarrow
Begin $\xrightarrow
  [\text{Text below the arrow\footnotemark[1]}]
  {\text{Text above the arrow}}$ end
\footnotetext[1]{this is footnote}\stepcounter{footnote}

foo\footnote{bar}
\end{document}
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