Author
Jacques E. Guerchais
Bio: Jacques E. Guerchais is an academic researcher from University of Western Brittany. The author has contributed to research in topics: Crystal structure & Cyclopentadienyl complex. The author has an hindex of 15, co-authored 83 publications receiving 799 citations.
Papers published on a yearly basis
Papers
More filters
TL;DR: In this paper, the reaction between oxomolybdenum(V) and triphenylphosphine oxide (OPPh3) produces the mononuclear complex [MoOI3L2] and the dinuclear complex 1 [Mo2O4I2L3], the crystal structure of which has been studied by X-ray.
3 citations
TL;DR: In this paper, a trigonal-bipyramidal stereochemistry is ascribed to these complexes, essentially on the basis of electronic and vibrational spectra and of X-ray powder and single-crystal results.
Abstract: The anions [P(CHCOCH2R)O(OEt)2]–[R = NEt2(L2), [graphic omitted]H2(L3), or [graphic omitted]H2(L4)] form five-co-ordinate complexes [MX(L)](M = CoII, L = L2, L3, or L4 and X = Br, I, NCS, or NCSe; M = ZnII, L = L3 of L4, and X = Cl, Br, or I) A trigonal-bipyramidal stereochemistry is ascribed to these complexes, essentially on the basis of electronic and vibrational spectra and of X-ray powder and single-crystal results Such a structure may be attained by polymerization using X, the phosphorus and carbonyl oxygen atoms, and the nitrogen atom of the ligand, but depends on the metal ion and the steric demands of the ligands Under suitable conditions, six-co-ordination is attained for the complexes [Co(NCY)(L3)(OH2)](Y = S or Se), the stability of which is attributed to the formation of hydrogen bonds
2 citations
TL;DR: The authors derives thiamolybdatricyclodecatriene a partir de bis-trifluoromethyl-4,5 di-η 5 -cyclopentadienyl-3,3 thioxo-2 thia-1molybda-3 cyclopentene-4 dicarboxylate 4,5 de dimethyle et d'iodomethane
2 citations
TL;DR: In this article, a destructive two-electron reduction according to an electrochemical-chemical-electrochemical process with a diffusion-controlled intervening chemical step is described, leading to the dinuclear species [W2(CO)10(µ-SMe)] on the time-scale of controlled potential electrolyses.
Abstract: The compounds [(η5-C5H5)(CO)3M(µ-SR)W(CO)5] have been studied by usual electrochemical methods (cyclic voltammetry, controlled-potential electrolysis, and coulometry). They undergo a destructive two-electron reduction according to an electrochemical–chemical–electrochemical process with a diffusion-controlled intervening chemical step. The [W(CO)5(SMe)]– anion generated by the reduction of the complexes undergoes chemical reactions leading to the dinuclear species [W2(CO)10(µ-SMe)]– on the time-scale of controlled-potential electrolyses.
2 citations
TL;DR: The existence of several isomers of the ions (MoO 2 F 2 (AB)) could be explained by the influence of π-bonding as discussed by the authors, which can be found in about 15 new ions (MO n F m (AB) − (n = 0, 1, 2, n + m = 4, AB = bidentate ligand; M = Mo, W, Ti, V).
Abstract: The existence of several isomers of the ions (MoO 2 F 2 (AB)) could be envisaged. The fact that there is only one form can be explained by the influence of π-bonding. One finds this effect in about 15 new ions (MO n F m (AB)) − ( n = 0, 1, 2, n + m = 4, AB = bidentate ligand; M = Mo, W, Ti, V). The trans position has also been observed in monomeric or dimeric compounds ( e.g. , (Mo 2 O 4 F 4 (C 2 O 4 )) 2− ). Although previous workers have reported the reduction of molybdenum(VI) in HBr medium, by reducing the rate of the oxidation-reduction process, we have been able to observe the co-existence of Br − and Mo(VI) ions when preparing numerous compounds with a view to exchange. The natural preferential selection of structural forms is found through exchanging F, Cl, Br. X-ray crystallographic measurements allow one to observe the resemblance between the ligands O, F, Cl, OO, which makes it possible to broaden the idea of oxo-species as defined by Selbin and Mitchell. These analogies are not apparent from spectroscopic methods.
1 citations
Cited by
More filters
TL;DR: The factor that controls the activity of these chelates is not fully understood but parameters such as redox potentials of the metal and electronic structure appear to be crucial as discussed by the authors.
499 citations
TL;DR: The reaction chemistry of nitriles with transition metal complexes is reviewed in this paper, where the authors survey data published during the period 1977-early 1994 on new reaction processes such as insertion into metal-hydrogen and carbon bonds, coupling between one nitrile and an unsaturated metal fragment, reduction to amines, attack by protic and aprotic nucleophiles and electrophilic attack as well as some catalytic transformations.
427 citations
TL;DR: In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website as discussed by the authors, in case of legitimate complaints the material will be removed.
Abstract: Disclaimer/Complaints regulations If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.
425 citations
TL;DR: In this article, a spectroscopic and structural investigation of binuclear silver(I) complexes supported by aliphatic phosphine ligands, namely [Ag(PCy3)(O2CCF3)]2 (1), [Ag2(μ-dcpm)2]X2 (X = CF3SO3, 2; PF6, 3; dcpm = bis(dicyclohexylphosphino)methane), and [Ag 2(mdcpm)(μ-O2ccF3] (4), is described.
Abstract: A spectroscopic and structural investigation of binuclear silver(I) complexes supported by aliphatic phosphine ligands, namely [Ag(PCy3)(O2CCF3)]2 (1), [Ag2(μ-dcpm)2]X2 (X = CF3SO3, 2; PF6, 3; dcpm = bis(dicyclohexylphosphino)methane), and [Ag2(μ-dcpm)(μ-O2CCF3)2] (4), is described. X-ray structural analyses of 1−4 reveal Ag−Ag separations of 3.095(1), 2.948 (av), 2.923 (av), and 2.8892(9) A, respectively. Due to the optical transparency of the phosphine ligands, the UV−vis absorption band at 261 nm in CH3CN for 2 and 3 is assigned to a 4dσ* → 5pσ transition originating from Ag(I)−Ag(I) interactions. The argentophilic nature of this band is verified by the resonance Raman spectrum of 2 with 273.9 nm excitation, where virtually all of the Raman intensity appears in the Ag−Ag stretch fundamental (80 cm-1) and overtone bands. Complexes 2 and 3 exhibit photoluminescence in the solid state at room temperature.
315 citations
310 citations