Metallophthalocyanines as catalysts in electrochemical reactions

Reactions of transition metal-coordinated nitriles

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Metal-Assisted Cycloaddition Reactions in Organotransition Metal Chemistry

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.

Spectroscopic evidence for argentophilicity in structurally characterized luminescent binuclear silver(I) complexes

Coordination and organometallic chemistry of metal-NO complexes.

The structure of the title compound has been determined by the heavy-atom method from 1 350 reflections, measured with a diffractometer, and refined by full-matrix least-squares methods to R 0.046. Crystal are orthorhombic, space group Pbca, with a= 11.15(2), b= 26.25(4), and c= 7.56(1)A. In the structure the monomeric anions have a pentagonal-bipyramidal co-ordination, with the bidentate peroxo-group and terdentate pyridine-2,6-di-carboxylate group filling the equatorial positions, and the oxide and fluoride ligands in the axial positions. There is a very long MO–F distance (2.058 A), which can be correlated with the trans effect of the oxide ligand (MO–O 1.661 A).

Fluoride crystal structures. part 31. ammonium fluoro-oxoperoxo(pyridine-2,6-dicarboxylato)molybdate(vi)

The structure of the title compound has been determined from X-ray diffractometer data and refined by full-matrix least-squares methods to R 0.078 for 1 084 reflections. Crystals are monoclinic, space group P21/c, a= 6.43, b= 15.80, c= 13.94 A, β= 134.8°. The vanadium atom has a distorted square pyramidal arrangement and achieves a distorted octahedral co-ordination by weak dimer formation, through asymmetric oxygen bridges. The vanadium–oxygen distances are V–O (terminal) 1.618(8) and V–O (bridge) 1.691(7) and 2.361(7)A.

Jacques E. Guerchais

Papers

Fluoride crystal structures. part 31. ammonium fluoro-oxoperoxo(pyridine-2,6-dicarboxylato)molybdate(vi)

Fluoride crystal structures. part 30. 2,2′-bipyridylfluorodioxovanadium(v)

CYCLOPENTADIENYL VANADIUM COMPLEXES: DI-μ-METHYLTHIOBIS(DICARBONYLCYCLOPENTADIENYLVANADIUM)

Fluoride crystal structures. xxv. trifluorobis(4-methoxypyridine n-oxide) antimony(iii) hydrate

Co-ordination of organophosphorus anions. iii. spectral studies of some five- - and six-co-ordinate cobalt(ii) and zinc(ii) halides and pseudohalides