spectroscopy: \#{} without non-breaking space

Question

When using \#{} in the experimental environment of chemmacros it gives the number followed by the nucleus, but they are separated by a regular space, instead of a non-breaking space.

I don't know if this is intentional, but it can lead to the nucleus being printed in the next line, whereas it should be treated as a unit and therefore stick to the number.

Is there a way to redefine this macro by myself or will I have to manually type 2~H for now?

My MWE:

\documentclass{scrbook} 

\usepackage{chemmacros}
\chemsetup{modules={spectroscopy}}

\begin{document}
    \begin{experimental}
        \NMR(300)[CD3COOD]
            \val{9.87} (d, \J{1.2}, \#{1}),
            \val{6.54} (d, \J{3.4}, \#{2}).
    \end{experimental}
\end{document}

giving me (notice the H in the second line).

the question would be much easier to answer if there was a MWE — David Carlisle, Oct 12 '17 at 15:43

cgnieder · Accepted Answer · 2017-10-12T17:22:57.543

\# is defined in the spectroscopy module (the file chemmacros.module.spectroscopy.code.tex) to be equal to \chemmacros_nmr_number:n inside the experimental environment. This function is defined as

\cs_new_protected:Npn \chemmacros_nmr_number:n #1
  {
    \__chemmacros_nmr_number:n {#1}
    \skip_horizontal:N \l__chemmacros_nmr_space_skip
    \chemmacros_chemformula:V \g__chemmacros_nmr_element_tl
  }

but probably should be defined like this:

\cs_new_protected:Npn \chemmacros_nmr_number:n #1
  {
    \__chemmacros_nmr_number:n {#1}
    \chemmacros_skip_nobreak:N \l__chemmacros_nmr_space_skip
    \chemmacros_chemformula:V \g__chemmacros_nmr_element_tl
  }

So you can add this to your preamble:

\ExplSyntaxOn
\cs_set_protected:Npn \chemmacros_nmr_number:n #1
  {
    \__chemmacros_nmr_number:n {#1}
    \chemmacros_skip_nobreak:N \l__chemmacros_nmr_space_skip
    \chemmacros_chemformula:V \g__chemmacros_nmr_element_tl
  }
\ExplSyntaxOff

after loading the spectroscopy module.

I'll change this in the package. The fix will be included starting with v5.8c.

Perfect! I was actually just looking at that same snippet of code on GitHub trying to find an answer before posting my question, but I couldn't make any sense of it. :) — basseur, Oct 12 '17 at 16:14

spectroscopy: \#{} without non-breaking space

1 Answers1