Novel Organometallic Building Blocks for Crystal\nEngineering. Synthesis and Structural Characterization\nof the Dicarboxylic Acid [Cr&lt;sup&gt;0&lt;/sup&gt;(η&lt;sup&gt;6&lt;/sup&gt;-C&lt;sub&gt;6&lt;/sub&gt;H&lt;sub&gt;5&lt;/sub&gt;COOH)&lt;sub&gt;2&lt;/sub&gt;], of Two\nPolymorphs of Its Oxidation Derivative\n[Cr&lt;sup&gt;I&lt;/sup&gt;(η&lt;sup&gt;6&lt;/sup&gt;-C&lt;sub&gt;6&lt;/sub&gt;H&lt;sub&gt;5&lt;/sub&gt;COOH)&lt;sub&gt;2&lt;/sub&gt;]&lt;sup&gt;+&lt;/sup&gt;[PF&lt;sub&gt;6&lt;/sub&gt;]&lt;sup&gt;-&lt;/sup&gt;, and of the Zwitterionic\nForm [Cr&lt;sup&gt;I&lt;/sup&gt;(η&lt;sup&gt;6&lt;/sup&gt;-C&lt;sub&gt;6&lt;/sub&gt;H&lt;sub&gt;5&lt;/sub&gt;COOH)(η&lt;sup&gt;6&lt;/sup&gt;-C&lt;sub&gt;6&lt;/sub&gt;H&lt;sub&gt;5&lt;/sub&gt;COO)]&lt;sup&gt;†&lt;/sup&gt;

Dario Braga (1492780); Lucia Maini (1628629); Fabrizia Grepioni (1492783); Christoph Elschenbroich (2664967); Francesca Paganelli (3086730); Olav Schiemann (29468)

JOURNAL ARTICLE

Novel Organometallic Building Blocks for Crystal\nEngineering. Synthesis and Structural Characterization\nof the Dicarboxylic Acid [Cr0(η6-C6H5COOH)2], of Two\nPolymorphs of Its Oxidation Derivative\n[CrI(η6-C6H5COOH)2]+[PF6]-, and of the Zwitterionic\nForm [CrI(η6-C6H5COOH)(η6-C6H5COO)]†

Dario Braga (1492780)Lucia Maini (1628629)Fabrizia Grepioni (1492783)Christoph Elschenbroich (2664967)Francesca Paganelli (3086730)Olav Schiemann (29468)

Year: 2018 Journal: OPAL (Open@LaTrobe) (La Trobe University) Publisher: La Trobe University

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Abstract

The synthesis and structural characterization of the neutral diamagnetic organometallic\ndicarboxylic acid [Cr0(η6-C6H5COOH)2] (1) is reported. Oxidation of 1 by oxygen leads to\nformation of the paramagnetic dicarboxylic acid cation [CrI(η6-C6H5COOH)2]+ (2), which has\nbeen isolated as the [PF6]- salt in two crystalline polymorphic modifications, a monoclinic\nform α and a triclinic form β. The neutral zwitterionic form [CrI(η6-C6H5COOH)(η6-C6H5COO)] (3) has been obtained in a cocrystal with [NH4][PF6] upon treatment of the acid salt\n[CrI(η6-C6H5COOH)2]+[PF6]-with ammonia. The hydrogen bonding interactions established\nby the neutral and cationic acids are discussed and compared with those observed in the\nzwitterionic form and in the related complexes [FeII(η5-C5H4COOH)2] and [CoIII(η5-C5H4COOH)2]+[PF6]-.

Keywords:

Dicarboxylic acid Cocrystal Cationic polymerization Salt (chemistry) Hydrogen bond Paramagnetism Fumaric acid

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Organometallic Complex Synthesis and Catalysis

Physical Sciences → Chemistry → Organic Chemistry

Crystallography and molecular interactions

Physical Sciences → Chemistry → Physical and Theoretical Chemistry

Inorganic Chemistry and Materials

Physical Sciences → Chemistry → Inorganic Chemistry

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