Novel Organometallic Building Blocks for Crystal Engineering. Synthesis and Structural Characterization of the Dicarboxylic Acid [Cr0(h6-C6H5COOH)2], of Two Polymorphs of it's Oxidation Derivative [CrI(h6-C6H5COOH)2]+[PF6]-, and of the Zwitterionic Form [CrI(h6-C6H5COO)(h6-C6H5COOH)]

D. Braga*, L. Maini, F. Grepioni, C. Elschenbroich, F. Paganelli, Olav Schiemann

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

The synthesis and Structural characterization of the neutral diamagnetic organometallic dicarboxylic acid [Cr-0(eta (6)-C6H5COOH)(2)] (1) is reported. Oxidation of 1 by oxygen leads to formation of the paramagnetic dicarboxylic acid cation [Cr-I(eta (6)-C6H5COOH)(2)](+) (2), which has been isolated as the [PF6](-) salt in two crystalline polymorphic modifications, a monoclinic form alpha and a triclinic form beta. The neutral zwitterionic form [CrI(eta (6)-C6H5COOH)(eta (6)-C6H5-COOH] (3) has been obtained in a cocrystal with [NH4][PF6] upon treatment of the acid salt [Cr-I(eta (6)-C6H5COOH)(2)] + [PF6]-with ammonia. The hydrogen bonding interactions established by the neutral and cationic acids are discussed and compared with those observed in the zwitterionic form and in the related complexes Fe-II(eta5-C5H4COOH)(2)] and [Co-III(eta (5)-C5H4-COOH)(2)+[PF6](-).

Original languageEnglish
Pages (from-to)1875-1881
Number of pages7
JournalOrganometallics
Volume20
Issue number9
DOIs
Publication statusPublished - 30 Apr 2001

Keywords

  • O HYDROGEN-BONDS
  • INTERMOLECULAR INTERACTIONS
  • SUPRAMOLECULAR SYNTHONS
  • METAL-COMPLEXES
  • RECOGNITION
  • STRATEGIES
  • BEHAVIOR
  • CATIONS
  • MAGNETS
  • DESIGN

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