Vincenzo Passarelli

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2d250p

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The Possible Role of H+ and Ca2+ in Photobehavior of Blepharisma japonicum

Proceedings in life sciences (1984)

Vincenzo Passarelli Francesco Lenci G. Colombetti Enrico Barone Renzo Nobili

10.1007/978-3-642-69767-8_53

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Citations (16)

Rhodium and Iridium Complexes of Lutidine-Based NHC/Amino Pincer Ligands: From Monodentate to Tetradentate Coordination Enabled by C–H Activation

Organometallics (2023)

Miguel González-Lainez M. Victoria Jiménez Vincenzo Passarelli F. Javier Modrego Jesús J. Pérez‐Torrente

A series of rhodium and iridium complexes derived from lutidine-based ligands (lutidine, 2,6-dimethylpyridine) with NHC and amino side-donor functions have been prepared and characterized. Deprotonation of the functionalized imidazolium salts, [tBuHImCH2PyCH2NR2]Br, by the bridging methoxo ligands of the dinuclear complexes [M(μ-OMe)(cod)]2 affords [MBr(cod)(κC-tBuImCH2PyCH2NR2)] (M = Rh and Ir) complexes from which a series of Rh(I) and Ir(I) complexes including [M(cod)(κ3C,N,N′-tBuImCH2PyCH2NR2)]+, [Rh(CO)(κ3C,N,N′-tBuImCH2PyCH2NR2)]+, and [IrBr(CO)2(κC-tBuImCH2PyCH2NR2)] are readily accessible by halide abstraction and/or carbonylation reactions. In contrast, direct metalation of imidazolium salts with the dinuclear compounds [M(μ-Cl)(cod)]2 (M = Rh and Ir) in the presence of potassium acetate and potassium iodide, a well-established synthetic route to M(III) species, provides access to unusual di-iodido M(III) cyclometalated compounds [MI2{κ4C,C′,N,N′-(CH2CMe2ImCH2PyCH2NR2)}] in low yield. Experimental studies combined with DFT calculations suggest that cyclometalated M(III) hydrido [MH(CH3CN){κ4C,C′,N,N′-(CH2CMe2ImCH2PyCH2NR2)}]+ compounds and square-planar cyclometalated M(I) [M{κ4C,C′,N,N′-(CH2CMe2ImCH2PyCH2NR2)}] species resulting from their deprotonation by acetate could be intermediates involved in the formation of these compounds. Based on the observed formation of elemental rhodium, disproportionation of square-planar cyclometalated M(I) complexes to afford M(0) and the cationic M(II) species [M{κ4C,C′,N,N′-(CH2CMe2ImCH2PyCH2NR2)}]+ is proposed. Reaction of the latter with iodide (I–) would regenerate the M(I) intermediate to give an iodo radical (I•) that in turn could dimerize to form diiodine I2. In this regard, DFT calculations have shown that the oxidative addition of diiodine to the cyclometalated M(I) intermediates leading to the di-iodido M(III) cyclometalated compounds is a highly exergonic process.

Carbonylation

Coordination complex

10.1021/acs.organomet.3c00403

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Metal–Ligand Cooperative Proton Transfer as an Efficient Trigger for Rhodium-NHC-Pyridonato Catalyzed gem-Specific Alkyne Dimerization

ACS Catalysis (2021)

María Galiana‐Cameo Asier Urriolabeitia Eduardo Barrenas Vincenzo Passarelli Jesús J. Pérez‐Torrente

The mononuclear square-planar Rh{κ2-X,N-(Xpy)}(η2-coe)(IPr) (X = O, NH, NMe, S) complexes have been synthesized from the dinuclear precursor [Rh(μ-Cl)(IPr)(η2-coe)]2 and the corresponding 2-heteroatom-pyridinate salts. The Rh-NHC-pyridinato derivatives are highly efficient catalysts for gem-specific alkyne dimerization. Particularly, the chelating N,O-pyridonato complex displays turnover frequency levels of up 17 000 h–1 at room temperature. Mechanistic investigations and density functional theory calculations suggest a pyridonato-based metal–ligand cooperative proton transfer as responsible for the enhancement of catalytic activity. The initial deprotonation of a Rh-π-alkyne complex by the oxo-functionality of a κ1-N-pyridonato moiety has been established to be the rate-limiting step, whereas the preferential protonation of the terminal position of a π-coordinated alkyne accounts for the exclusive observation of head-to-tail enynes. The catalytic cycle is closed by a very fast alkenyl–alkynyl reductive elimination.

Alkyne

Heteroatom

Moiety

Catalytic cycle

Transfer hydrogenation

10.1021/acscatal.1c00602

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Citations (20)

CCDC 2282658: Experimental Crystal Structure Determination

The Cambridge Structural Database (2023)

Marco Palmese Jesús J. Pérez‐Torrente Vincenzo Passarelli

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2gm94k

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CCDC 943405: Experimental Crystal Structure Determination

The Cambridge Structural Database (2017)

Isabel Méndez Ricardo Rodrı́guez Víctor Polo Vincenzo Passarelli Fernando J. Lahoz

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc10npfs

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CCDC 2169453: Experimental Crystal Structure Determination

The Cambridge Structural Database (2022)

María Carmona Roberto Pérez Joaquina Ferrer Ricardo Rodrı́guez Vincenzo Passarelli

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2bthc1

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CCDC 2169451: Experimental Crystal Structure Determination

The Cambridge Structural Database (2022)

María Carmona Roberto Pérez Joaquina Ferrer Ricardo J. Rodríguez Vincenzo Passarelli

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

10.5517/ccdc.csd.cc2bth9z

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CCDC 1849963: Experimental Crystal Structure Determination

The Cambridge Structural Database (2018)

Marta Angoy M. Victoria Jiménez F. Javier Modrego Luis A. Oro Vincenzo Passarelli

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.

Crystal (programming language)

10.5517/ccdc.csd.cc20317f

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CCDC 2079429: Experimental Crystal Structure Determination

The Cambridge Structural Database (2021)

María Galiana‐Cameo Vincenzo Passarelli Jesús J. Pérez‐Torrente Andrea Di Giuseppe Ricardo Castarlenas

10.5517/ccdc.csd.cc27stc7

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