Veja um exemplo simples:
\documentclass{article}
\usepackage{chemfig,chemmacros}
\chemsetup[chemformula]{format=\sffamily}
\renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}}
\setatomsep{2em}
\setdoublesep{.6ex}
\setbondstyle{semithick}
\begin{document}
\begin{center}
\schemestart
\chemfig{-[:30](-[2])-[:-30]OH}
\arrow
\chemfig{-[:30](-[2])=^[:-30]O}
\schemestop
\end{center}
\end{document}
\chemsetup[chemformula]{format=\sffamily}
\renewcommand*\printatom[1]{\ensuremath{\mathsf{#1}}}
\setatomsep{2em}
\setdoublesep{.6ex}
\setbondstyle{semithick}
\begin{center}
\schemestart
\chemfig{-[:30](-[2])-[:-30]OH}
\arrow
\chemfig{-[:30](-[2])=^[:-30]O}
\schemestop
\end{center}
Outro exemplo:
...
\begin{center}\small\setatomsep{1.5em}
\schemestart
\chemfig{*6(=-=(-(=[2]O)-[::-60]O-[0]O-[::30](=[2]O)-[::-60]*6(=-=-=-))-=-)}
\arrow{->[$\Delta$]}
2 \chemfig{*6(=-=(-(=[2]O)-[::-60]\lewis{0.,O})-=-)}
\arrow
2 \chemfig{*6(=-=(-[,.15,,,draw=none]\lewis{0.,})-=-)}\+\ch{2 CO2 ^}
\schemestop
\end{center}
...
\begin{center}\small\setatomsep{1.5em}
\schemestart
\chemfig{*6(=-=(-(=[2]O)-[::-60]O-[0]O-[::30](=[2]O)-[::-60]*6(=-=-=-))-=-)}
\arrow{->[$\Delta$]}
2 \chemfig{*6(=-=(-(=[2]O)-[::-60]\lewis{0.,O})-=-)}
\arrow
2 \chemfig{*6(=-=(-[,.15,,,draw=none]\lewis{0.,})-=-)}\+\ch{2 CO2 ^}
\schemestop
\end{center}
...
Mais informações em LaTeX and Chemistry - Drawing Reaction Schemes
Tikz Chemistry examples
Chemfig Manual ou digite texdoc chemfig no terminal.
Palavras-chave: Química no LaTeX
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