路易斯结构与 chemfig 内部以及 chemformula 内部是否对齐？

Question

你好。
我正在制作一个beamer关于 Lewis 点结构的演示文稿。我的大部分代码都来自这个问题 (像书一样绘制路易斯结构）...但后来我被 BH3 难住了...（第三个反应）。我不确定我是否可以用 来写 BH3（用双点代替键/线）或者chemformula package我是否需要使用 的方式来写。我尝试用s命令（注释掉）chemfig重新创建 BH3 结构，这在环境之外似乎有效，但如果我粘贴它而不是命令，文档就不会编译。chemfig\Chargealign\chlewis

任何帮助都将受到赞赏。

谢谢。

\documentclass{beamer}
\usepackage{chemformula}
\usepackage{elements}
\usepackage{chemfig}

\begin{document}
\begin{frame}{MWE}
\begin{align}
    \ch{
      !(\elconf{H})( "\chlewis{0.}{H}" ) +
      !(\elconf{H})( "\chlewis{0.}{H}" )
      & ->
      !(\writeelconf{2})( "\chlewis{0.}{H}" "\chlewis{180.}{H}" ) \\
      %%
      !(\elconf{N})( "\chlewis{0.90:180.270.}{N}" ) +
      !(\elconf{O})( "\chlewis{0:90:180.270.}{O}" )
      & ->
      !(\writeelconf{2,2+5}\writeelconf{2,2+6}) (  "\chlewis{0:90:180.}{N}" "\chlewis{45:180:315:}{O}" ) \\
      %%
      !(\elconf{H})( "\chlewis{0.}{3H}" ) +
      !(\elconf{B})( "\chlewis{0.90.180.}{B}" )
      & ->
      !(\writeelconf{2,2+4}) (  "\chlewis{0:90:180:}{B}" )
      %!(\writeelconf{2,2+4}) ( "\chemfig[atom sep=1.25em]{H-[,,,,draw=none]\Charge{[circle]0=\:,90=\:,180=\:}{B}(-[:90,,,,draw=none]H)-[,,,,draw=none]H} " )
    } 
  \end{align}   
\end{frame}
\end{document}

Answer 1

与chemfig和elements

\documentclass{beamer}
\usepackage{elements}
\usepackage{chemfig}
\setchemfig{compound sep=7em, arrow offset=2em, + sep left=1.5em, + sep right=1.5em}
\setcharge{.radius=0.2ex}
\begin{document}
\begin{frame}{MWE}
\begin{align}
    \schemestart
    \chemname{\chemfig{\charge{0:1pt=\.}{H}}}{\scriptsize\elconf{H}}
    \+
    \chemname{\chemfig{\charge{180:1pt=\.}{H}}}{\scriptsize\elconf{H}}
    \arrow(.mid east--.mid west){->[][][0.8pt]}[,1]
    \schemestop
    &
    \schemestart
    \chemname{\chemfig{\charge{0:1pt=\.}{H}-[,0.5,,,draw=none]\charge{180:1pt=\.}{H}}}{\scriptsize\writeelconf{2}}
    \schemestop
    \\[3ex]
    \schemestart
    \chemname{\chemfig{\charge{0:1pt=\.,90:1pt=\:,180:1pt=\.,270:1pt=\.}{N}}}{\scriptsize\elconf{N}}
    \+
    \chemname{\chemfig{\charge{0:1pt=\:,90:1pt=\:,180:1pt=\.,270:1pt=\.}{O}}}{\scriptsize\elconf{O}}
    \arrow(.mid east--.mid west){->[][][0.8pt]}[,1]
    \schemestop
    &
    \schemestart
    \chemname{\chemfig{\charge{0:1pt=\:,90:1pt=\:,180:1pt=\.}{N}-[,0.5,,,draw=none]\charge{-45:0pt=\:,45:0pt=\:,180:1pt=\:}{O}}}{\scriptsize\writeelconf{2,2+5}\,\scriptsize\writeelconf{2,2+6}}
    \schemestop
    \\[2ex]
    \schemestart
    3\,\chemname{\chemfig{\charge{0:1pt=\.}{H}}}{\scriptsize\elconf{H}}
    \+
    \chemname{\chemfig{\charge{0:1pt=\.,90:1pt=\.,180:1pt=\.}{B}}}{\scriptsize\elconf{B}}
    \arrow(.mid east--.mid west){->[][][0.8pt]}[,1]
    \schemestop
    &
    \schemestart
    \chemname{\chemfig{H-[,0.4,,,draw=none]\charge{0:1pt=\:,90:1pt=\:,180:1pt=\:}{B}(-[2,0.4,,,draw=none]H)-[,0.4,,,draw=none]H}}{\scriptsize\writeelconf{2,2+4}}
    \schemestop
\end{align}
\end{frame}
\end{document}

Answer 2

可以在 \chemfig 命令之前调整键的特征，以免每个化学键重复这些特征。

要使用 ChemFig 的 \charge 命令编写路易斯结构：

\documentclass{article}
\usepackage{chemfig}
\begin{document}
\setchemfig{atom sep=10pt, bond style={draw=none}}
\chemfig{\charge{0=\: ,90=\:,180=\:}{B}(-[0]H)(-[2]H)(-[4]H)}
\end{document}