María José Camazón

Reactions of palladium (II) chloride with 1,4 - diphenyl - 2,3 - dimethyl - 1,4 - diazabutadiene and 1,4-DI(p-methoxyphenyl)-2,3-dimethyl- 1,4 - diazabutadiene

Abstract The reactions of palladium(II) chloride with 1,4 - diphenyl - 2,3 - dimethyl - 1,4 - diazabutadiene and 1,4 - di(p - methoxyphenyl) - 2,3 - dimethyl - 1,4 - diazabutadiene are described. With 1,4 - diphenyl - 2,3 - dimethyl - 1,4 - diazabutadiene diimine fission is produced, giving rise to a product identified by elemental analysis, IR and Raman spectra, and X-ray diffraction, as trans-dichlorobis(aniline) palladium(II). The complex is soluble in dimethylformamide and crystallizes with two molecules of solvent. The substance crystallizes in the monoclinic space group P21/n. The X-ray data were refined to R = 0.047 and Rw = 0.046. Final distances are Pd N = 2.060(5)Aand Pd C1 = 2.299(2)A. There are two bifurcated intermolecular N H ... C1 and C H... C1 hydrogen bonds which, together with one more intermolecular hydrogen bond N H... O, are responsible for the packing of the molecules. However, when 1,4 - di(p - methoxyphenyl) - 2,3 - dimethyl - 1,4 - diazabutadiene was treated with palladium chloride under the same conditions cis - dichloro - 1,4 - di(p - methoxyphenyl) - 2,3 - dimethyl - 1,4 - diazabutadiene was formed, as deduced from elemental analysis, and IR and Raman spectra.

Orthometalation reactions of substituted benzylideneamines by palladium(II) chloride

Abstract Carbonmetal σ-bonded complexes have been synthesized by reaction of various substituted benzylideneamines with PdCl 2 . The chloro-bridged complexes formed have been studied by spectroscopic methods and by thermogravimetric analyses.

Diazabutadiene cobalt(II) complexes

SummaryStudies on the chelates of cobalt(II) with the bidentate ligands 1,4-diphenyl(2,3-dimethyl-1,4-diazabutadiene) (PMB) and 1,4-di(p-methoxyphenyl)-2,3-dimethyl-1,4-diazabutadiene (MPMB) have been carried out. On the basis of elemental analyses, the complexes are [Co(PMB)Cl2], [Co(PMB)2(C1O4)2], [Co(MPMB)Cl2] and [Co(MPMB)2(ClO4)2].Both ligands are bidentatevia nitrogen atoms in all the complexes. The magnetic susceptibility and i.r. and u.v.-visible spectra are reported and discussed. The chloro-compounds involving two chlorine ligands and, in the perchlorate compounds, the ClO4− groups are bound to the cobalt(II) centre.

ENANTIOMERICALLY PURE PALLADACYCLES WITH ONE STEREOGENIC CSP3 CENTER DIRECTLY BONDED TO THE METAL

Abstract The reaction of homochiral 1-methyl (ethyl and phenyl)-2- p -tolylsulfinyl ethanones with Pd(OAc) 2 /AcOH yield enantiomerically pure trimer orthopalladated compounds containing a stereogenic carbon C-sp 3 directly joined to the Pd atom.

Complexes of copper(II) with substituted benzylideneamines

Abstract The synthesis and identification of copper(II) complexes with N -phenyl- (PBI), N -(1-phenylmethyl)- (PMBI) and N (1-phenylmethoxy)-benzoyl-benzylideneamine (PXBI) are described. These monoamine ligands present the possibility of coordinating to the metal atom either through the oxygen or through the nitrogen atom, or of acting as bidentate chelating agents. The compounds were assigned as CuL 2 Cl 2 for the chloro complexes based upon analytical data and molar conductivity measurements. The preparation of Cu(II) complexes using Cu(ClO 4 ) 2 and Cu(NO 3 ) 2 was not possible. Attempts have been made to assign their probable structure on the basis of absorption and reflectance spectra, IR spectra, magnetic data and electron paramagnetic resonance. In the resulting compounds two ligands that act as unidentate via their nitrogen atom, and two chlorines are bound to the Cu(II) centre. All compounds appear to be monomeric.

Mössbauer, far-infrared and Raman spectra of tetrachloro[1,4-di(p-methoxyphenyl)-2,3-dimethyl-1,4-diazabutadiene] tin(IV)

SummaryThe dependence of the logarithm of the area under the tin-119 Mössbauer resonance (A at different temperatures are normalized toA77) vs. temperature is measured for tetrachloro[1,4-di(p-methoxyphenyl)-2,3-dimethyl-1,4-diazabutadiene] tin(IV). The slope of the plot of lnA vs.T is −2.46·10−2K−1, suggesting a monomeric structure. In the vibrational spectra the significant stretching vibrations agree with acis octahedral configuration of C2v symmetry.ZusammenfassungDie Abhängigkeit des Logarithmus der Fläche unter der Zinn-119-Mössbauer-Resonanz (A in verschiedenen Temperaturen werden zuA77 normalisiert) von der Temperatur wurde für Tetrachlor[1,4-di(p-methoxyphenyl)-2,3-dimethyl-1,4-diazabutadien]zinn(IV) gemessen. Der Anstieg lnA gegenT von −2.46·10−2K−1 spricht für eine monomere Struktur. In den Vibrations-Spektren stimmen die wichtigsten Dehnungsschwingungen mit einercis-oktaedrischen Konfiguration von C2v-Symmetrie überein.

Synthesis, infrared spectra and thermal analysis of some new substituted ortho-trichlorostannylbenzylideneamine compounds

Abstract The novel substituted o -trichlorostannylbenzylideneamines o -SnCl 3 C 6 H 4 C( N - p -C 6 H 4 R)-COPh · Cl 4 C (R = H, Me, OMe or Br) complexes where synthesized and investigated in the solid state by infrared and thermal analysis.

Complexes of copper(II) with diazabutadienes

SummaryStudies on the chelate complexes of copper(II) with the bidentate ligands, 1,4-diphenyl-2,3-dimethyl-1,4-diazabutadiene (PMB) and 1,4-di(p-methoxyphenyl)-2,3-dimethyl-1,4-diazabutadiene (MPMB), have been carried out. On the basis of the elemental analysis and molar conductivity, the complexes have been characterized as [Cu(PMB)Cl2], [Cu(PMB)2](ClO4)2, [Cu(MPMB)Cl2] and [Cu(MPMB)2](ClO4)2. Both diazabutadienes are bidentate via nitrogen atoms. The temperature dependence of the magnetic susceptibility and the electron paramagnetic resonance, i.r. and u.v.-vis spectra are reported. All compounds appear to be monomers.

New complexes derived from copper(II) salts and bis-N-(p-methoxyphenyl)-2,5-furylideneimine

SummaryTwo new complexes derived from bis-N-(p-methoxyphenyl)-2, 5-furylideneimine(L) (1) and copper(II)[CuL2](ClO4)2·4H2O (2) and [(CuCl2)2L] (3), have been synthesized. The i.r. spectra of both complexes show that the ligand coordinatesvia oxygen and nitrogen. Spectral and magnetic properties are consistent with the formulation of (2) as an elongated tetragonal octahedral copper(II) structure and (3) as distorted square-planar copper(II) structure, where each copper atom is bonded to two chlorine, one oxygen and one nitrogen atoms, and two carbon and two copper atoms tetrahedrally surround the oxygen atom.