Novel Organometallic Building Blocks for Crystal Engineering. Synthesis and Structural Characterization of the Dicarboxylic Acid [Cr0(η6-C6H5COOH)2], of Two Polymorphs of Its Oxidation Derivative [CrI(η6-C6H5COOH)2]+[PF6]-, and of the Zwitterionic Form [CrI(η6-C6H5COOH)(η6-C6H5COO)]

Novel Organometallic Building Blocks for Crystal Engineering. Synthesis and Structural Characterization of the Dicarboxylic Acid [Cr0(η6-C6H5COOH)2], of Two Polymorphs of Its Oxidation Derivative [CrI(η6-C6H5COOH)2]+[PF6]-, and of the Zwitterionic Form [CrI(η6-C6H5COOH)(η6-C6H5COO)]

The synthesis and structural characterization of the neutral diamagnetic organometallic dicarboxylic acid [Cr0(η6-C6H5COOH)2] (1) is reported. Oxidation of 1 by oxygen leads to formation of the paramagnetic dicarboxylic acid cation [CrI(η6-C6H5COOH)2]+ (2), which has been isolated as the [PF6]- salt...

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Veröffentlicht in:Organometallics 2001-04, Vol.20 (9), p.1875-1881
Hauptverfasser: Braga, Dario, Maini, Lucia, Grepioni, Fabrizia, Elschenbroich, Christoph, Paganelli, Francesca, Schiemann, Olav
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container_end_page 1881
container_issue 9
container_start_page 1875
container_title Organometallics
container_volume 20
creator Braga, Dario
Maini, Lucia
Grepioni, Fabrizia
Elschenbroich, Christoph
Paganelli, Francesca
Schiemann, Olav
description The synthesis and structural characterization of the neutral diamagnetic organometallic dicarboxylic acid [Cr0(η6-C6H5COOH)2] (1) is reported. Oxidation of 1 by oxygen leads to formation of the paramagnetic dicarboxylic acid cation [CrI(η6-C6H5COOH)2]+ (2), which has been isolated as the [PF6]- salt in two crystalline polymorphic modifications, a monoclinic form 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 [CrI(η6-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 [FeII(η5-C5H4COOH)2] and [CoIII(η5-C5H4COOH)2]+[PF6]-.
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Synthesis and Structural Characterization of the Dicarboxylic Acid [Cr0(η6-C6H5COOH)2], of Two Polymorphs of Its Oxidation Derivative [CrI(η6-C6H5COOH)2]+[PF6]-, and of the Zwitterionic Form [CrI(η6-C6H5COOH)(η6-C6H5COO)]</atitle><jtitle>Organometallics</jtitle><addtitle>Organometallics</addtitle><date>2001-04-30</date><risdate>2001</risdate><volume>20</volume><issue>9</issue><spage>1875</spage><epage>1881</epage><pages>1875-1881</pages><issn>0276-7333</issn><eissn>1520-6041</eissn><abstract>The synthesis and structural characterization of the neutral diamagnetic organometallic dicarboxylic acid [Cr0(η6-C6H5COOH)2] (1) is reported. Oxidation of 1 by oxygen leads to formation of the paramagnetic dicarboxylic acid cation [CrI(η6-C6H5COOH)2]+ (2), which has been isolated as the [PF6]- salt in two crystalline polymorphic modifications, a monoclinic form α and a triclinic form β. 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title Novel Organometallic Building Blocks for Crystal Engineering. Synthesis and Structural Characterization of the Dicarboxylic Acid [Cr0(η6-C6H5COOH)2], of Two Polymorphs of Its Oxidation Derivative [CrI(η6-C6H5COOH)2]+[PF6]-, and of the Zwitterionic Form [CrI(η6-C6H5COOH)(η6-C6H5COO)]
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