0000000001308917
AUTHOR
Bruno Donnadieu
showing 16 related works from this author
Zirconocen–Benzyme-Mediated Intramolecular Coupling of Bis(alkynyl)phosphane: A Way to Mono- and Tricyclic 1,2-Dihydrophosphetes
1997
Versatile behavior of conjugated diynes with zirconocene reactive species
2008
Thermal decomposition of Cp2ZrPh2 in the presence of the buta-1,3-diynes RC≡CC≡CR (R = Ph, SiMe3) can lead to seven- or five-membered metallacycles. In both cases a stable benzo-fused seven-membered zirconacyclocumulene arising from a 2-fold insertion of the triple bonds of the dialkyne in the in situ generated zirconocene benzyne is formed. In the case of Me3SiC≡CC≡CSiMe3 a second minor complex is isolated: a 3-alkynyl-substituted zirconaindene arising from a β monoinsertion of one acetylenic function of the conjugated diyne in the zirconocene benzyne. No stable 2-alkynyl-substituted zirconacycle was isolated. This α monoinsertion complex is an intermediate in the exchange of the metalated…
Synthesis, X-ray crystal structure, NMR characterization and theoretical calculations on [Cp2Ta(η2-H2)(CO)]+, the first thermally stable group 5 dihy…
2001
Protonation of Cp2TaH(CO) (Cp = C5H5, 1a; C5H4But, 1b) by HBF4·Et2O at −78 °C in CH2Cl2 affords [Cp2TaH2(CO)]BF4 (2, 3) as mixtures of 2 isomers. The minor ones (2a, 2b) contain the known trans-dihydride [Cp2TaH2(CO)]+ cations whereas the major ones (3a, 3b) are [Cp2Ta(η2-H2)(CO)]BF4, the first group 5 dihydrogen complexes. The crystal structure of the analogous complex 3a·BArf4 recorded at 120 K confirms the presence of the coordinated dihydrogen ligand, which displays an H–H separation of 1.09(2) A in agreement with distances calculated from NMR data. Protonation of Cp2TaH2(SiMe2Ph) by (Et2O)2 ·HBArf4 does not lead to an analogous silane derivative but to the new dinuclear complex [(Cp2…
Intramolecular coupling of acetylenic groups of bis(alkynyl)phosphanes and silanes mediated by benzynezirconocene: a route to new mono- and tricyclic…
2004
Benzo-zirconacyclohexadiene-phospha or silacyclobutene fused ring systems are easily prepared via a benzynezirconocene intermediate by means of thermolysis of Cp 2 ZrPh 2 in the presence of bis(alkynyl)phosphanes or silanes. These polyunsaturated systems are the source of a variety of new mono- or tricyclic heterocycles incorporating either one or two heteroatoms.
"Through-space" nuclear spin-spin J(PP) coupling in tetraphosphine ferrocenyl derivatives: a (31)P NMR and X-ray structure correlation study for coor…
2004
Herein, we report on (31)P(31)P solution-phase "through-space" nuclear spin-spin coupling constants (J(PP)) from a novel family of organometallic tetraphosphine nickel and palladium complexes. These J(PP) constants were accurately determined through NMR iterative simulation based on the second-order spectra obtained for the compounds. The corresponding solid-state X-ray structures of the complexes were determined, and the "through-space" P.P distances are reported. Due to the blocked conformation of the species in solution, a qualitative and semiquantitative experimental correlation is obtained, which links the geometric parameters and the intensity of the corresponding P.P coupling constan…
Desulfurization processes of thiosemicarbazonecopper(ii) derivatives in acidic and basic aqueous media
2013
This work provides structural evidence for different desulfurization processes in aqueous solutions of [CuL]+ derivatives (HL = pyridine-2-carbaldehyde thiosemicarbazone). Structural resolution has been achieved for the [{CuL(SH)}2] (1), [CuLCl]2[Cu(pic)2] (pic− = picolinato, pyridine-2-carboxilato) (2) and [Cu(HL)(NCS)](NO3) (4) compounds, together with a derivative of 4 with formula [Cu(HL)(NCS)][Cu(HL)(NCS)0.72(NO3)0.28](NO3)2 (5), whose HS−, pic− and NCS− ligands come from thiosemicarbazone breakage. The behaviour of the [CuL]+ species in basic aqueous solutions or water under reflux has been compared with that exhibited by iron(III), cobalt(III), zinc(II) and lead(II) derivatives of th…
Zirconocene-ate Zwitterionic Complexes: Preparation and X-ray Structure
1998
Zirconocen-Benzin-vermittelte intramolekulare Kupplung eines Bis(alkinyl)phosphans, ein Weg zu mono- und tricyclischen 1,2-Dihydrophospheten
1997
A Nonanuclear Iron(II) Single-Molecule Magnet
2004
Isolation, dynamic NMR study and X-ray characterisation of a bis sulfonium zirconocene-ate dimer.
2004
The novel dimer [Cp(2)Zr[upper bond start]([minus sign in circle])S([plus sign in circle])CH(Ph)CH[double bond]C[upper bond end]PPh(2)](2), the first example of a structurally characterised sulfur-bridged binuclear zirconathiolane complex, was prepared, characterised by NMR spectroscopy and X-ray crystallography, and some aspects of its solution behaviour were studied.
A family of enneanuclear iron(II) single-molecule magnets.
2008
Complexes [Fe 9 (X) 2 -(02CMe)8{(2-py) 2 CO 2 } 4 ] (X - = OH (1), N 3 - (2), and NCO- (3)) have been prepared by a route previously employed for the synthesis of analogous Co 9 and Ni 9 complexes, involving hydroxide substitution by pseudohalides (N 3 - , NCO-). As indicated by DC magnetic susceptibility measurements, this substitution induced higher ferromagnetic couplings in complexes 2 and 3, leading to higher ground spin states compared to that of 1. Variable-field experiments have shown that the ground state is not well isolated from excited states, as a result of which it cannot be unambiguously determined. AC susceptometry has revealed out-of-phase signals, which suggests that these…
CCDC 930871: Experimental Crystal Structure Determination
2013
Related Article: Rubén Gil-García, Roberto Fraile, Bruno Donnadieu, Gotzon Madariaga, Vaidas Januskaitis, Jordi Rovira, Lucía González, Joaquín Borrás, Francisco Javier Arnáiz, Javier García-Tojal|2013|New J.Chem.|37|3568|doi:10.1039/C3NJ00321C
CCDC 930872: Experimental Crystal Structure Determination
2013
Related Article: Rubén Gil-García, Roberto Fraile, Bruno Donnadieu, Gotzon Madariaga, Vaidas Januskaitis, Jordi Rovira, Lucía González, Joaquín Borrás, Francisco Javier Arnáiz, Javier García-Tojal|2013|New J.Chem.|37|3568|doi:10.1039/C3NJ00321C
CCDC 930874: Experimental Crystal Structure Determination
2013
Related Article: Rubén Gil-García, Roberto Fraile, Bruno Donnadieu, Gotzon Madariaga, Vaidas Januskaitis, Jordi Rovira, Lucía González, Joaquín Borrás, Francisco Javier Arnáiz, Javier García-Tojal|2013|New J.Chem.|37|3568|doi:10.1039/C3NJ00321C
CCDC 930873: Experimental Crystal Structure Determination
2013
Related Article: Rubén Gil-García, Roberto Fraile, Bruno Donnadieu, Gotzon Madariaga, Vaidas Januskaitis, Jordi Rovira, Lucía González, Joaquín Borrás, Francisco Javier Arnáiz, Javier García-Tojal|2013|New J.Chem.|37|3568|doi:10.1039/C3NJ00321C
CCDC 930875: Experimental Crystal Structure Determination
2013
Related Article: Rubén Gil-García, Roberto Fraile, Bruno Donnadieu, Gotzon Madariaga, Vaidas Januskaitis, Jordi Rovira, Lucía González, Joaquín Borrás, Francisco Javier Arnáiz, Javier García-Tojal|2013|New J.Chem.|37|3568|doi:10.1039/C3NJ00321C