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Abstract
Even though metallacyclopentadienes (MCPs) are among the most common metallacycles, their electron delocalization (aromaticity) has received far less attention than other metallacycles, such as metallabenzenes. We systematically studied the aromaticity of MCPs with energetic (isomerization stabilization energy), density (delocalization index) and magnetic (current density) aromaticity indices. The indices agree that metallacyclopentadienes are, in general, weakly aromatic at most. The 18e− complexes showed the expected weak aromaticity, and only the d8 molecules are somewhat anti-aromatic. However, the theoretical account of the aromaticity of the 16e− MCPs is more convoluted. We find that the aromatic criteria for a 16e−d4 ruthenacyclopentadiene disagree. The lack of agreement shows that significant electron delocalization is not always related to great stability or to strong diatropic currents.
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Affiliation(s)
- José‐Antonio García‐López
- Grupo de Química Organometálica Departamento de Química Inorgánica Facultad de Química Universidad de Murcia 30100 Murcia Spain
| | - Isabel Saura‐Llamas
- Grupo de Química Organometálica Departamento de Química Inorgánica Facultad de Química Universidad de Murcia 30100 Murcia Spain
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3
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Scattolin T, Bortolamiol E, Caligiuri I, Rizzolio F, Demitri N, Visentin F. Synthesis and comparative study of the anticancer activity of η3-allyl palladium(II) complexes bearing N-heterocyclic carbenes as ancillary ligands. Polyhedron 2020. [DOI: 10.1016/j.poly.2020.114607] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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4
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The importance of the electronic and steric features of the ancillary ligands on the rate of cis–trans isomerization of olefins coordinated to palladium(0) centre. A study involving (Z)-1,2-ditosylethene as olefin model. Polyhedron 2019. [DOI: 10.1016/j.poly.2019.114144] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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5
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Scattolin T, Giust S, Bergamini P, Caligiuri I, Canovese L, Demitri N, Gambari R, Lampronti I, Rizzolio F, Visentin F. Palladacyclopentadienyl complexes bearing purine‐based N‐heterocyclic carbenes: A new class of promising antiproliferative agents against human ovarian cancer. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.4902] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Thomas Scattolin
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Campus Scientifico Via Torino 155 30174 Venezia‐Mestre Italy
| | - Sonia Giust
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Campus Scientifico Via Torino 155 30174 Venezia‐Mestre Italy
| | - Paola Bergamini
- Dipartimento di Scienze Chimiche e FarmaceuticheUniversità degli Studi di Ferrara Via Fossato di Mortara 74 44121 Ferrara Italy
| | - Isabella Caligiuri
- Pathology Unit, Department of Molecular Biology and Translational ResearchNational Cancer Institute and Center for Molecular Biomedicine – CRO Aviano Italy
| | - Luciano Canovese
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Campus Scientifico Via Torino 155 30174 Venezia‐Mestre Italy
| | - Nicola Demitri
- Elettra – Sincrotrone Trieste SS 14 Km 163.5 in Area Science Park 34149 Basovizza Trieste Italy
| | - Roberto Gambari
- Dipartimento di Scienze della Vita e BiotecnologieUniversità degli Studi di Ferrara Via Fossato di Mortara 74 44121 Ferrara Italy
| | - Ilaria Lampronti
- Dipartimento di Scienze della Vita e BiotecnologieUniversità degli Studi di Ferrara Via Fossato di Mortara 74 44121 Ferrara Italy
| | - Flavio Rizzolio
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Campus Scientifico Via Torino 155 30174 Venezia‐Mestre Italy
- Pathology Unit, Department of Molecular Biology and Translational ResearchNational Cancer Institute and Center for Molecular Biomedicine – CRO Aviano Italy
| | - Fabiano Visentin
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Campus Scientifico Via Torino 155 30174 Venezia‐Mestre Italy
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Canovese L, Visentin F, Scattolin T, Santo C, Bertolasi V. Synthesis of novel olefin complexes of palladium(0) bearing monodentate NHC, phosphine and isocyanide spectator ligands. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.01.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Scattolin T, Canovese L, Visentin F, Paganelli S, Canton P, Demitri N. Synthesis of novel allyl palladium complexes bearing purine based NHC and a water soluble phosphine and their catalytic activity in the Suzuki‐Miyaura coupling in water. Appl Organomet Chem 2017. [DOI: 10.1002/aoc.4034] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Thomas Scattolin
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Venice Italy
| | - Luciano Canovese
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Venice Italy
| | - Fabiano Visentin
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Venice Italy
| | - Stefano Paganelli
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Venice Italy
| | - Patrizia Canton
- Dipartimento di Scienze Molecolari e NanosistemiUniversità Ca' Foscari Venice Italy
| | - Nicola Demitri
- Elettra – Sincrotrone Trieste, S.S. 14 Km 163.5 in Area Science Park 34149 Basovizza Trieste Italy
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Canovese L, Visentin F, Scattolin T, Santo C, Bertolasi V. Synthesis and reactivity toward olefin exchange and oxidative addition of some platinum(0) olefin complexes with thioquinolines as spectator ligands. Polyhedron 2017. [DOI: 10.1016/j.poly.2017.03.053] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Choi JH, Jung KY, Kim YJ, Im HJ, Lee SW. Macrocyclic complexes containing a platinacycle or palladacycle composed of an isocyanate dimer unit: Reactivity towards isocyanides and cyclotrimerization of isocyanates. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.05.061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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10
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Canovese L, Visentin F, Santo C. Reactivity of palladium olefin complexes with heteroditopic NHC–pyridine as spectator ligand toward olefin exchange. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.06.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Synthesis of novel palladium allyl complexes bearing heteroditopic NHC–S ligands. Kinetic study on the carbene exchange between bis-carbene palladium allyl complexes. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.01.016] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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