Polymorphism in (Tricyclohexylphosphine)gold(I) 2-Mercaptobenzoate - A Tale of Two Structural Motifs

Douglas R. Smyth, Beverly R. Vincent, Edward R.T. Tiekink

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29 Citations (Scopus)


(Tricyclohexylphosphine)gold(I) 2-mercaptobenzoate is found in four distinct crystal forms. All forms show a linear P-Au-S geometry. In three of the polymorphs the molecule may be described as spherical, as a result of an intramolecular O-H⋯S bond formed between the carboxylic acid group and the coordinated sulfur atom: i.e., a "ball" motif. These are in contrast to a "rod" otif (previously reported) that features association between centrosymmetric molecules via the familiar carboxylic acid dimer. Both motifs may be obtained under the same crystallizing conditions, a result which indicates that there is little energy difference between the different crystal forms. The process of crystallization may be described as a competition between the efficient crystal packing (ball motif) and the formation of carboxylic acid dimers (rod motif).

Original languageEnglish
Pages (from-to)113-117
Number of pages5
JournalCrystal Growth and Design
Issue number2
Publication statusPublished or Issued - Mar 2001
Externally publishedYes

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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