This DokuWiki plugin formats a molecular formula by using 'chem' tag.

Usage of seperation between atom-numbers and charge-numbers

You can install by using 'Manager Plugins' in Admin tools. Download URL is available at https://www.dokuwiki.org/plugin:chem.

• 2013-01-20 Source code was moved to GitHub.
• 2008-09-29 Supported the Open document format export using ODT plugin.
• 2008-03-21 Seperator implementation and bracket support

(Kibi posted bug-fix and made some extension for isotope expression in the previous system of DW. Since a 'discussion plugin' is not deployed in this current DW, I pasted his/her comment here. Thanks, Kibi — i.obataya 2009/11/11 19:17)

I've made some improvements to your plugin: now it can handle not only charge number of ion, but oxidation state: N^-3, N^-1, N⁰, N⁺¹, N⁺³, H₂⁺¹S⁺⁶O₃^-2S^-2

Fixed error with “+” in equation: 2H₂ + O₂ ⇒ 2H₂O

Fixed error with alternative formulas like Anion₂Cation₃

Added support of isotope numbers: ²³⁸U, 2²³⁹Pu

All you need is replace function getChemFormat with that:

  function getChemFormat($raw){
    $pattern = array("/([A-Za-z\]\)]+)(0)/", "/[\|]?([0-9]*)[\^]/", "/([^ ][\]\)]?)[\|]?(([\-\+][0-9]*)|([0-9]*[\-\+]))/", "/([A-Z]|[a-z]|\)|\])([1-9][0-9]*)/");
    $replace = array("\${1}<sup>\${2}</sup>", "<sup>\${1}</sup>", "\${1}<sup>\${2}</sup>","\${1}<sub>\${2}</sub>");
    return preg_replace($pattern,$replace,$raw);
  }

The examples ahead would be like this:

• oxidation state: N^-3, N^-1, N⁰, N⁺¹, N⁺³, H₂⁺¹S⁺⁶O₃^-2S^-2
• “+” in equation: 2H₂ + O₂ ⇒ 2H₂O
• alternative formulas like Anion₂Cation₃
• isotope numbers: ²³⁸U, 2²³⁹Pu