Special "chemical bond" symbol

Question

I would like to use a symbol in a chemical reaction equation which represents a solid's surface.

A common symbol used for this purpose is '>' or the \equiv symbol, but what I would like is actually something like the \equiv symbol but with the length of em-dash (basically like 3 em-dashes stacked on-top of one another).

Ultimately though, I would actually like a symbol with 5 lines on-top of each other, the height of a normal capitalized character.

Do you guys know of any such symbol that may exist? Or, is it possible to 'build' something like this?

It can be done putting an = symbol on top of the equiv symbol, but it would be slightly higher than a capital letter. — Bernard, Sep 21 '19 at 22:58
There are specific packages for that, see e.g. https://tex.stackexchange.com/a/260839. Example: `\documentclass{article} \usepackage{chemformula} \NewChemBond{quindruple}{ \foreach \i in {-.3em,-0.15em,.0em,.15em,0.3em}{ \draw[chembond] ([yshift=\i]chemformula-bond-start) -- ([yshift=\i]chemformula-bond-end) ; } } \begin{document}
\ch{Ct\bond{quindruple}Ct}

\end{document}` — , Sep 22 '19 at 00:29

score 6 · Answer 1 · answered Sep 27 '19 at 14:51

Here's a chemformula solution:

\documentclass{article}

\usepackage{chemformula}

\NewChemBond{quintuple}{
  \foreach \i in {-.7ex,-.35ex,0ex,.35ex,.7ex}{
    \draw[chembond]
      ([yshift=\i]chemformula-bond-start) -- ([yshift=\i]chemformula-bond-end) ;
  }
}
\NewChemCompoundProperty{|}{\bond{quintuple}}

\begin{document}

\setchemformula{bond-length=1em}

\ch{Ti\bond{quintuple}Ti}

\ch{A-B + A=B + A+B + A|B}

\end{document}

score 5 · Answer 2 · answered Sep 21 '19 at 23:28

5

Is this close to what you want?

\documentclass{article}
\usepackage{amsmath, amssymb}
\usepackage{graphicx}
\usepackage{stackengine}

\newcommand{\mybond}{\mathrel{\scalebox{1.5}[0.84]{$\stackMath\stackinset{c}{-1.4pt}{c}{4.3pt}{=}{\equiv}$}}}

\begin{document}

\[\mathrm{N}\mybond \text{---}\]%

\end{document}

answered Sep 21 '19 at 23:28

Bernard

271,350

Yes, thanks Bernard and Schrödinger's cat, that's exactly it. Nice answers guys! – Adrian Sep 22 '19 at 07:45

score 5 · Answer 3 · edited Sep 27 '19 at 20:02

Thanks for all the great leads guys. I liked @unbonpetit's response with the long lines (admittedly longer than em-dash like I initially wanted), so I decided to modify the code a bit and got a really nice result:

What's nice is you can play around with the positioning and I was able to get it slightly (vertically) off-center so that it lies closer to the baseline. Anyway, here is the code:

\documentclass{article}
\usepackage{chemfig}
\def\fivebondsep{1.25pt}
\usetikzlibrary{decorations}
\pgfdeclaredecoration{ddddb}{initial}{
    \state{initial}[width=\pgfdecoratedremainingdistance]
        {\foreach\i in{1.5,0.5,-0.5,-1.5,-2.5}{%
            \pgfpathmoveto{\pgfpoint{0pt}{\i*\fivebondsep}}\pgfpathlineto{\pgfpoint{\pgfdecoratedremainingdistance}{\i*\fivebondsep}}}
        }
    \state{final}
        {}
}
\tikzset{5bond/.style={decorate,decoration=ddddb}}
\begin{document}
\chemfig{Ti-[,,,,5bond]Ti}
\end{document}

You don't even have to rename the ("fourbond...", etc.) definitions of course, but I just did it for completeness.

I did a similar one for a triple bond too. Thanks again for all the great answers everyone!

Special "chemical bond" symbol

3 Answers3