带有箭头和路易斯点的 Chemfig 绘图

Question

如果我想用这个chemfig包装画一些类似的东西，我该怎么做？

我特别想知道如何以最简单、最美观的方式绘制箭头。

更新：在一位回复的帮助下，我已成功完成箭头右侧的部分。到目前为止，我的代码如下所示：

\documentclass[border=5mm]{standalone}
\usepackage{chemfig}
\definesubmol{e}{-[,.15,,,draw=none]}

\begin{document}

\schemestart
    \chemfig{[:30]**6(--(-C(=[90]O)-O)----)}
    %
    \quad \arrow \quad
    %
    \chemfig{[:30]**6(--(!e\Lewis{0.,})----)}
    \arrow{0}[,0]\+
    \chemfig{C(=[90]O)(=[270]O)}
\schemestop

\end{document}

它看起来是这样的：

我仍然缺少一些您可能已经看到的元素：

1. 氧分子上的路易斯点没有显示出来。
2. 箭镞仍不见踪影。
3. 左侧与箭头和右侧没有正确对齐。

如果有人对我的代码有任何改进，请随时告诉我！:)

Answer 1

\documentclass{article}

\usepackage{chemfig}
\usetikzlibrary{calc}

\begin{document}

\setchemfig{lewis radius =0.25ex,lewis sep =1ex}
\schemestart
\chemfig{
    [:-30]**6(---(@{a1}-[@{a2}0]C(=[2]O)(=[6,,,,draw=none]\phantom{O})
    -[@{a3}0]@{a4}\Lewis{0.,O}-[,0.7,,,draw=none])---)}
\arrow{->}
\chemfig{-[0,0.5,,,draw=none]**6(---(-[,0.3,,,draw=none]\Lewis{0.,})---)}
\arrow{0}[,0.2]
\+
\arrow{0}[,0.2]
\chemfig{C(=[2]O)(=[6]O)}
\schemestop
\chemmove{
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(-1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. (a1);
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(-1pt,0)$);
    \draw[arrows = {-Stealth[harpoon,swap]}, shorten <=2pt, shorten >=1pt]
        ($(a4)+(1.25ex,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(1pt,0)$);
}

\end{document}

编辑

将 \Lewis 更改为 \charge

\documentclass{article}
\usepackage{chemfig}
\usetikzlibrary{calc}
\begin{document}
\setchemfig{lewis radius =0.25ex,lewis sep =1ex}
\schemestart
\chemfig{
    [:-30]**6(---(@{a1}-[@{a2}0]C(=[2]O)(=[6,,,,draw=none]\phantom{O})
    -[@{a3}0]@{a4}\charge{0=\.}{O}-[,0.7,,,draw=none])---)}
\arrow{->}
\chemfig{-[0,0.5,,,draw=none]**6(---\charge{0:2pt=\.}{}---)}
\arrow{0}[,0.2]
\+
\arrow{0}[,0.2]
\chemfig{C(=[2]O)(=[6]O)}
\schemestop
\chemmove{
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(-1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. (a1);
    \draw[arrows = {-Stealth[harpoon]}, shorten <=1pt, shorten >=1pt]
        ($(a2)+(1pt,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(-1pt,0)$);
    \draw[arrows = {-Stealth[harpoon,swap]}, shorten <=2pt, shorten >=1pt]
        ($(a4)+(1.25ex,0)$) .. controls +(270:10mm) and +(270:10mm) .. ($(a3)+(1pt,0)$);
}
\end{document}