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I am using a chemical notation repeatedly so made this new command

\newcommand{\MolCState}{$\text{C}^3\Pi_u$}

The problem is that in the text when I type 

\MolCState and the rest of the text

the output is like

enter image description here

there is no space before "and". Why is this different than typing 

$\text{C}^3\Pi_u$ and the rest of the text

where space is there without adding anything?

Amin
  • 249
  • That is basic TeX syntax, the space terminates the command name, use \MolCState\ – David Carlisle Apr 11 '16 at 18:11
  • Use \MolCState\ or \MolCState{}, please consider to use the mhchem package also for better display of chemical entities –  Apr 11 '16 at 18:11

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