How to draw NO2 in LaTeX?

Question

It would be nice if you could help me to draw NO2 in LaTeX. The figure should look like the example image.

On this website is some information about the chemfig/chemmakro package. My code untill now shows a NO2 molecule. Now I just need to add the arrows and nodes (red areas on the original image). How to do that? First of all I will thank @Sigur (he let the chemfig code work) and @ajeh who corrected my angles. And I will thank the German Texwelt (German LaTeX help forum). On that website a user named "Clemens" helped (20 Jul, 05:27) the user "goldsonne23" with the delocated bondings on this website. So all the Tikz part is just "stolen" from Clemns. Here the code:

\documentclass[a4paper, 12pt, twocolumn]{article}
\usepackage[utf8]{inputenc}
\usepackage{libertine}
\usepackage{chemfig, chemmacros}
\usetikzlibrary{decorations}

%delocated bondings
\pgfdeclaredecoration{ddbond}{initial}{
  \state{initial}[width=4pt]{
    \pgfpathlineto{\pgfpoint{4pt}{0pt}}
    \pgfpathmoveto{\pgfpoint{2pt}{2pt}}
    \pgfpathlineto{\pgfpoint{4pt}{2pt}}
    \pgfpathmoveto{\pgfpoint{4pt}{0pt}}
  }
  \state{final}{\pgfpathlineto{\pgfpointdecoratedpathlast}}
}
\tikzset{
  lddbond/.style={decorate,decoration=ddbond},
  rddbond/.style={decorate,decoration={ddbond,mirror}},
  elmove/.style={->,red,shorten >=3pt, shorten <=3pt}
}


\begin{document}
%\chemfig{<atom1><bond type>[<angle>,<coeff>,<tikz code>]<atom2>}
\chemfig{O-[:22.85,,,,rddbond]N-[:-22.85,,,,rddbond]O}
\end{document}

Anyone who can help? Yours faithfully, Basilius

Answer 1

I cobbled this together using the example in the chemfig package (section 12.7).

Edit: I also added a plain label (without arrows) next to the bond. I think this looks better because the line with arrows is not quite parallel to the line indicating the bond.

\documentclass[a4paper, 12pt, twocolumn]{article}
\usepackage[utf8]{inputenc}
\usepackage{libertine}
\usepackage{chemfig, chemmacros}
\setatomsep{5em}
\usepackage{siunitx}
\usetikzlibrary{calc,decorations}

%delocated bondings
\pgfdeclaredecoration{ddbond}{initial}{
  \state{initial}[width=4pt]{
    \pgfpathlineto{\pgfpoint{4pt}{0pt}}
    \pgfpathmoveto{\pgfpoint{2pt}{2pt}}
    \pgfpathlineto{\pgfpoint{4pt}{2pt}}
    \pgfpathmoveto{\pgfpoint{4pt}{0pt}}
  }
  \state{final}{\pgfpathlineto{\pgfpointdecoratedpathlast}}
}
\tikzset{
  lddbond/.style={decorate,decoration=ddbond},
  rddbond/.style={decorate,decoration={ddbond,mirror}},
  elmove/.style={->,red,shorten >=2pt, shorten <=2pt}
}

\begin{document}
%\chemfig{<atom1><bond type>[<angle>,<coeff>,<tikz code>]<atom2>}
\chemfig{O-[:22.85,,,,rddbond]N-[:-22.85,,,,rddbond]O}

\newcommand\namebond[4][5pt]{\chemmove{\path(#2)--(#3)
node[midway,sloped,yshift=#1]{\color{red}#4};
}}

\newcommand\bondlengtharrows[4][9pt]{\chemmove{\path(#2)--(#3)
node(p1)[above,at end]{}
node(p2)[above,at start]{}
node[midway,sloped,yshift=#1]{\color{red}#4};
\draw[red,stealth-stealth](p1)--(p2);
}}

\newcommand\arcbetweennodes[3]{%
\pgfmathanglebetweenpoints{\pgfpointanchor{#1}{center}}{\pgfpointanchor{#2}{center}}% 
\let#3\pgfmathresult}

\newcommand\arclabel[6][red,thick,shorten <=2pt,shorten >=2pt]{%
\chemmove{%
\arcbetweennodes{#4}{#3}\anglestart \arcbetweennodes{#4}{#5}\angleend \draw[#1]([shift=(\anglestart:#2)]#4)arc(\anglestart:\angleend:#2); \pgfmathparse{(\anglestart+\angleend)/2}\let\anglestart\pgfmathresult \node[shift=(\anglestart:#2+1pt)#4,anchor=\anglestart+180,rotate=\anglestart+90,inner sep=0pt,outer sep=0pt]at(#4){\color{red}#6};}}

\chemfig[scale=2]{@{1}O-[:22.85,,,,rddbond]@{2}N-[:-22.85,,,,rddbond]@{3}O}
\namebond{1}{2}{\footnotesize\SI{119.7}{\pico\meter}}
\bondlengtharrows{2}{3}{\footnotesize\SI{119.7}{\pico\meter}}
\arclabel{5mm}{1}{2}{3}{\footnotesize104.45\si\degree}
\end{document}