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Chemfig：\chemmove 正确锚点

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Chemfig：\chemmove 正确锚点

我怎样才能使通过\chemmmove命令绘制的箭头不与C-R''' 键重叠？

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[italian]{babel}
\usepackage[
  a4paper,
  margin=15mm,
  bindingoffset=2mm,
  heightrounded,
]{geometry}

\usepackage{chemfig}
\usepackage{chemformula}
\usepackage{xcolor}
\usepackage[version=4]{mhchem}
\definecolor{cerulean}{HTML}{0080C0}

\begin{document}
\begin{flushleft}
\begin{figure}[htbp]
  \schemestart
    \chemfig[]{\chemabove{R}{\scriptstyle\color{magenta}{\delta +}}(-[:0]@{Nu}\chemabove{O}{\scriptstyle\color{cerulean}{\delta -}}H)}
    \+
    \chemfig[]{
    R'(-[:0]@{El}\chemabove[0.5pt]{C}{\scriptstyle\hspace{3.5mm}\color{magenta}{\delta +}}(-[0]H)(-[2]R'')(-[6]\chembelow{Cl}{\scriptstyle\color{cerulean}{\delta -}}))
    }
    \arrow(.base east--.base west){->[][][3pt]}   
   \chemname{\chemfig{R'-CH_{2}(-[:90]OR)}}{Etere}
   \+
   \chemfig{HCl}
  \schemestop
  \chemnameinit{}
  \chemmove[yshift=25em]{\draw[shorten <=7pt, shorten >=7pt](Nu).. controls +(north:1cm) and +(north:1cm).. (El);}
\end{figure}
\end{flushleft}
\end{document}

在此处输入图片描述

答案1

（将我的评论转化为答案）

您可以利用“命令”的语法..controls..（如果我可以这样称呼它），如下所示：

\chemmove[...]{\draw[...](Nu).. controls +(north:1cm) and +(105:1cm).. (El);}

只是表示105从正“x”轴逆时针测量 105 度，而不是north，这基本上意味着90。您可以将其更改为您喜欢的任何角度。

完整代码：

\documentclass{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
%\usepackage[italian]{babel}
\usepackage[
  a4paper,
  margin=15mm,
  bindingoffset=2mm,
  heightrounded,
]{geometry}

\usepackage{chemfig}
\usepackage{chemformula}
\usepackage{xcolor}
\usepackage[version=4]{mhchem}
\definecolor{cerulean}{HTML}{0080C0}

\begin{document}
\begin{flushleft}
\begin{figure}[htbp]
  \schemestart
    \chemfig[]{\chemabove{R}{\scriptstyle\color{magenta}{\delta +}}(-[:0]@{Nu}\chemabove{O}{\scriptstyle\color{cerulean}{\delta -}}H)}
    \+
    \chemfig[]{
    R'(-[:0]@{El}\chemabove[0.5pt]{C}{\scriptstyle\hspace{3.5mm}\color{magenta}{\delta +}}(-[0]H)(-[2]R'')(-[6]\chembelow{Cl}{\scriptstyle\color{cerulean}{\delta -}}))
    }
    \arrow(.base east--.base west){->[][][3pt]}   
   \chemname{\chemfig{R'-CH_{2}(-[:90]OR)}}{Etere}
   \+
   \chemfig{HCl}
  \schemestop
  \chemnameinit{}
  \chemmove[yshift=25em]{\draw[shorten <=7pt, shorten >=7pt](Nu).. controls +(north:1cm) and +(105:1cm).. (El);}
\end{figure}
\end{flushleft}
\end{document}

控制..

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