Chemfig - 如何在分子中形成不同颜色的键

Question

我想画一个与水分子形成氢键的乙醇分子。

我希望它们之间的连接是一条虚线，红色，线，但所有其他的连接都是正常的，但我不知道该怎么做。

我的代码（到目前为止）是：

\documentclass{article}
\usepackage{chemfig}

\begin{document}

\begin{center}
    \chemfig{H-C(-[2]H)(-[6]H)-C(-[2]H)(-[6]H)-O^{\delta^{-}}H^{\delta^{+}}--O^{\delta^{-}}(-H^{\delta^{+}})(-[6]H^{\delta^{+}})}
\end{center}

\end{document}

Answer 1

稍微复杂一点的方法

\documentclass{article}
\usepackage{chemfig}
\usetikzlibrary{decorations.markings}

\begin{document}
    
\begin{center}
\chemfig{H-C(-[2]H)(-[6]H)-C(-[2]H)(-[6]H)-\charge{20:4pt=$^{\delta^{-}}$}{O}-[,0.5,,,draw=none]\charge{20:4pt=$^{\delta^{+}}$}{H}-[,1.5,,,draw=none,
    postaction={decorate},
    decoration={
        markings,
        mark = at position 0.22 with {\fill[red] circle[radius=1pt];},
        mark = at position 0.5 with {\fill[red] circle[radius=1pt];},
        mark = at position 1-0.22 with {\fill[red] circle[radius=1pt];}
    }
    ]\charge{20:4pt=$^{\delta^{-}}$}{O}(-[6]\charge{20:4pt=$^{\delta^{-}}$}{H})-\charge{20:4pt=$^{\delta^{+}}$}{H}}
\end{center}

\end{document}

Answer 2

\documentclass{article}
\usepackage{chemfig}

\makeatletter
\tikzset{
    dot diameter/.store in=\dot@diameter,
    dot diameter=1pt,
    dot spacing/.store in=\dot@spacing,
    dot spacing=5.5pt,
    dots/.style={
        line width=\dot@diameter,
        line cap=round,
        dash pattern=on 0pt off \dot@spacing
    }
}
\makeatother

\begin{document}

\begin{center}
    \chemfig{H-C(-[2]H)(-[6]H)-C(-[2]H)(-[6]H)-O^{\delta^{-}}H^{\delta^{+}}-[,2,,,thick, dotted, red]\charge{20:4pt=$^{\delta^{-}}$}{O}(-[6]\charge{20:4pt=$^{\delta^{-}}$}{H})-\charge{20:4pt=$^{\delta^{+}}$}{H}}
\end{center}


\begin{center}
    \chemfig{H-C(-[2]H)(-[6]H)-C(-[2]H)(-[6]H)-O^{\delta^{-}}H^{\delta^{+}}-[,2,,,dots, red]\charge{20:4pt=$^{\delta^{-}}$}{O}(-[6]\charge{20:4pt=$^{\delta^{-}}$}{H})-\charge{20:4pt=$^{\delta^{+}}$}{H}}
\end{center}



\end{document}