Synthesis and structure of a trinuclear chromium(III)-nicotinic acid complex

Enrique Gonzalez-Vergara*, Jack Hegenauer, Paul Saltman, Michal Sabat, James A Ibers

*Corresponding author for this work

Research output: Contribution to journalArticle

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Abstract

The reaction of nicotinic acid (nic), chromic perchlorate hexahydrate, and sodium perchlorate in aqueous solution affords a Cr(III)-vitamin complex whose composition has been established to be Na[Cr3O(nicH)6(H2O)3][ClO4]8·nicH·6H2O, based on analytical data and a single-crystal X-ray analysis. In the [Cr3O(nicH)6(H2O)3]+7 ion a central oxygen atom is bonded to three chromium atoms. The nicotinic and zwitterions bridge these chromium centers through the carboxylate oxygen atoms. On each chromium atom a water oxygen, trans to the central oxygen atom, complexes the octahedral coordination. The ion has crystallographically imposed symmetry 6. The binding of nicotinic acid in this Cr(III)-nicotinic acid complex is significantly different from that currently proposed for the glucose tolerance factor.

Original languageEnglish (US)
Pages (from-to)115-118
Number of pages4
JournalInorganica Chimica Acta
Volume66
Issue numberC
DOIs
StatePublished - Jan 1 1982

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ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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