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Agostinho, M., V. Rosa, T. Aviles, R. Welter, and P. Braunstein. "Synthesis and characterization of Co and Ni complexes stabilized by keto- and acetamide-derived P,O-type phosphine ligands." Dalton T (2009): 814-822. AbstractWebsite

The coordination properties of the beta-keto phosphine ligands R(2)PCH(2)C(O)Ph (HL(1), R = i-Pr; HL(2), R = Ph), of the new acetamide-derived phosphine ligand (i-Pr)(2)PNHC(O) Me (HL(3)) and of Ph(2)PNHC(O) Me (HL(4)) have been examined towards Ni(II) complexes. Comparisons are made between systems in which the PCH(2) function of the ketophosphine has been replaced with an isoelectronic PNH group in amide-derived ligands, or the PCH functionality of phosphinoenolates with a PN group in phosphinoiminolate complexes. Furthermore, ligands HL(2) and HL(4) reacted with [(eta(5)-C(5)H(5))CoI(2)(CO)] to afford the phosphine mono-adducts [(eta(5)-C(5)H(5))CoI(2){Ph(2)PCH(2)C(O)Ph}] (1) and [(eta(5)-C(5)H(5))CoI(2){Ph(2)PNHC(O)Me}] (3), respectively, which upon reaction with excess NEt(3) yielded the phosphinoenolate complex [(eta(5)-C(5)H(5))CoI{Ph(2)PCH (center dot center dot center dot) under barC((center dot center dot center dot) under barO)Ph}] (2) and the phosphinoiminolate complex [(eta(5)-C(5)H(5))CoI{Ph(2)PN (center dot center dot center dot) under barC((center dot center dot center dot) under barO)Me}] (4), respectively. The complexes cis-[Ni{(i-Pr)(2)PN (center dot center dot center dot) under barC((center dot center dot center dot) under barO)Me}(2)] (6) and cis-[Ni{Ph(2)PN (center dot center dot center dot) under barC((center dot center dot center dot) under barO)Me}(2)] (7) were obtained similarly from NiCl(2) and HL(3) and HL(4), respectively, in the presence of a base. The phosphinoenolate complex [Ni{(i-Pr)(2)PCH (center dot center dot center dot) under barC((center dot center dot center dot) under barO) Ph}(2)] (5) exists in ethanol as a mixture of the cis and trans isomers, in contrast to cis-[Ni{(Ph(2)PCH (center dot center dot center dot) under barC((center dot center dot center dot) under barO)Ph}(2)], and the solid-state structure of the trans isomer of 5 was established by X-ray diffraction. The structures of the ligand HL3 and of the complexes 1, 3 in 3 center dot 3/2CH(2)Cl(2), 4, 6 and 7 have also been determined by X-ray diffraction and are compared with those of related complexes. Complexes 4, 6 and 7 contain a five-membered heteroatomic metallocyclic moiety, which is constituted by five different chemical elements. The structural consequences of the steric bulk of the P substituents and of the electronic characteristics of the P, O chelates are discussed.

Aviles, T., S. Jansat, M. Martinez, F. Montilla, and C. Rodriguez. "Deactivation of the Cobalt Catalyst for the Cyclotrimerization of Acetylenes in Ionic Liquids: Solvent Effects on the Mechanism and Thermal and Pressure Activation Parameters." Organometallics. 30 (2011): 3919-3922. AbstractWebsite

The deactivation reaction of the [CoCp(1,4-sigma-C(4)-[Ph](4))PPh(3)] catalyst for the cyclotrimerization of acetylenes has been kinetico-mechanistically studied under different temperature, pressure, and solvent conditions. The results indicate a dramatic change in mechanism from conventional to ionic liquid solvents due to the polarity of the medium.

Aviles, T., and J. H. Teuben. "On the Reactivity of V(Eta-C6h3me3-1,3,5)2i." J Organomet Chem. 253 (1983): 39-43. AbstractWebsite
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Aviles, T., A. Dinis, M. G. B. Drew, and V. Felix. "A novel infinite 1-D chain of Silver(I) bridged by trans-azobenzene." Monatsh Chem. 131 (2000): 1305-1310. AbstractWebsite

The self-assembly of Ag[BF(4)] with trans-azobenzene in dichloromethane yields a new coordination polymer ([Ag(mu -trans-azobenzene)H(2)O] [BF(4)])(n) which was characterized by X-ray single crystal diffraction. The crystal consists of 1-D zigzag cationic chains made up from [Ag(H(2)O)](+) units linked by trans-azobenzene bridges and BF(4)(-) anions. Hydrogen bonding interactions between the chains and BF(4)(-) anions occur via intermolecular C-H . . .F and O-H . . .F contacts, and the crystal displays a 2-D supramolecular structure.

Aviles, T., and M. L. H. Green. "Eta-Cyclopentadienylcobalt Chemistry - Allylic, Alkyl, and Hydrido-Derivatives." J Chem Soc Dalton (1979): 1116-1120. AbstractWebsite
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Aviles, T., F. Barroso, P. Royo, and J. H. Noordik. "New Eta-Allyl Eta-Cyclopentadienylcobalt Cations." J Organomet Chem. 236 (1982): 101-108. AbstractWebsite
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Aviles, T., M. A. A. F. D. Carrondo, M. F. M. Piedade, and G. Teixeira. "Reaction of [Mn(Ch3-Eta-5-C5h4)(Co)2pph3] with Iodine - Crystal-Structure of Diiodobis(Triphenylphosphineoxide)Manganese(Ii)." J Organomet Chem. 388 (1990): 143-149. AbstractWebsite
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Aviles, T., A. Dinis, J. O. Goncalves, V. Felix, M. J. Calhorda, A. Prazeres, M. G. B. Drew, H. Alves, R. T. Henriques, V. da Gama, P. Zanello, and M. Fontani. "Synthesis, X-ray structures, electrochemistry, magnetic properties, and theoretical studies of the novel monomeric [CoI2(dppfO(2))] and polymeric chain [CoI2(mu-dppfO(2))(n)]." J Chem Soc Dalton (2002): 4595-4602. AbstractWebsite

The new compound [Co(eta(5)-C5H5)(dppf-P,P')I]I, 1, was synthesised by the stoichiometric reaction of the Co(III) complex [Co(eta(5)-C5H5)(CO)I-2], 2, with 1,1'-bis(diphenylphosphino)ferrocene (dppf) in CH2Cl2, and was characterised by multinuclear NMR spectroscopy. Exposure to air of THF or CH2Cl2 solutions of compound 1 gave, in an unexpected way, a polymeric chain comprising bridging 1,1'-bis(oxodiphenylphosphoranyl) ferrocene (dppfO(2)) joining tetrahedral Co(II) units [CoI2(mu-dppfO(2))](n), 3. Attempts to obtain the polymeric chain 3 by the direct reaction of dppfO(2) with CoI2, in CH2Cl2, gave instead the monomeric compound [CoI2(dppfO(2))], 4, in which dppfO2 is coordinated in a chelating mode. The structural characterisation of compounds 2, 3, and 4 was carried out by single crystal X-ray diffraction studies. The magnetic behaviour of [CoI2(dppfO(2))] and [CoI2(mu-dppfO(2))](n) was studied, and the results are consistent with tetrahedral S = 3/2 Co-II, possessing a (4)A(2) ground state, and S = 0 Fe-II. In these compounds, Co-II negative zero field splittings were determined from an analysis of the magnetic susceptibility temperature dependence, with D/k = -13 and -14 K for CoI2(dppfO(2)) and [CoI2(mu-dppfO(2))](n), respectively. DFT calculations were performed in order to understand the electronic structure of [Co(eta(5)-C5H5)(dppf-P,P')I]I, 1, as well as that of the paramagnetic specie [CoI2(dppfO(2))], 4. The [CoI2(mu-dppfO(2))](n) chain was also analysed and found to behave very similarly to the monomeric iodine derivative 4. The calculations showed the unpaired electrons to be localized on the Co(II) centre in all these species. The rather complicated electrochemical behaviour exhibited by the dppf complex [Co-III(eta(5)-C5H5)(dppf-P,P')I]I and by [Co(dppfO(2))I-2] is discussed.

Aviles, Teresa, and Gabriela Teixeira. "Monocyclopentadienyl compounds of vanadium." Rev. Inorg. Chem.. 12 (1993): 95-155. Abstract

A review with 59 refs. describing the synthesis, structure, and reactivity of monocyclopentadienyl compds. of vanadium. [on SciFinder(R)]