# Chemmacros Experimental Environment Superscript

I am using the chemmacros package to typeset the experimental data of my research report. However, the options provided as settings for the output don't fit my needs. I would like to have atom numbers of the nuclei as superscripts instead of using a dash or a subscript. However, in the documentation a could only find the options side and sub. Is there a way of setting a superscript position?

Currently I am using the following settings:

\documentclass[a4paper,10pt,bibliography=totoc,listof=totoc]{scrreprt}
\usepackage{chemmacros}
\usepackage{siunitx}
\chemsetup[nmr]{delta=(ppm),pos-number=side,use-equal,format = \bfseries,list=true}
\sisetup{separate-uncertainty,per-mode=symbol,detect-all,range-phrase=--}

\begin{document}
\begin{experimental}

\NMR(600)[CDCl3] \val{2.01} (s, \#{24}, \pos{5}), \val{2.31} (s, \#{12},\pos{6})\\
\data{IR} ...

\end{experimental}
\end{document}


Any help or suggestions are greatly appreciated.

P.S. Is there a reason why the nmr option group is setting up the whole look of the experimental section? I was looking through the documentation for a more general option, but then found that this would do it.

Since 2014/01/24 (v4.3) chemmacros has the option pos-number=super:

\documentclass[a4paper,10pt,bibliography=totoc,listof=totoc]{scrreprt}
\usepackage{siunitx}

\chemsetup{
modules = spectroscopy ,
spectroscopy/delta=(ppm),
spectroscopy/pos-number=super,% <<<<<<<<<
spectroscopy/use-equal,
spectroscopy/format = \bfseries,
spectroscopy/list=true
}
\sisetup{
separate-uncertainty,
per-mode=symbol,
detect-all,
range-phrase=--
}

\begin{document}

\begin{experimental}
\NMR(600)[CDCl3] \val{2.01} (s, \#{24}, \pos{5}), \val{2.31} (s, \#{12},\pos{6})
\data{IR} ...
\end{experimental}

\end{document}


As you've noticed there is no option for this. You need to redefine \chemmacros_nmr_position:n. This should do what you want:

\documentclass[a4paper,10pt,bibliography=totoc,listof=totoc]{scrreprt}
\usepackage{chemmacros}
\usepackage{siunitx}
\chemsetup[nmr]{delta=(ppm),pos-number=side,use-equal,format = \bfseries,list=true}
\sisetup{separate-uncertainty,per-mode=symbol,detect-all,range-phrase=--}

\ExplSyntaxOn
\cs_set_protected:Npn \chemmacros_nmr_position:n #1
{
\chemmacros_chemformula:x
{
\exp_not:V \g__chemmacros_nmr_element_tl
\exp_not:n { ^{#1} }
}
}
\ExplSyntaxOff

\begin{document}
\begin{experimental}

\NMR(600)[CDCl3] \val{2.01} (s, \#{24}, \pos{5}), \val{2.31} (s, \#{12},\pos{6})\\
\data{IR} ...

\end{experimental}
\end{document}


To your PS: this has historical reasons. The \NMR command (and some of the options) existed before the experimental environment. When I added it all its options were grouped together in the nmr option group, too.

• I'll add an option for this to the next release – clemens Jan 18 '14 at 12:52