V. Romano

Polynuclear manganese(II) complexes with terdentate schiff bases

Die durch Kondensation von o-Aminophenol oder -thiophenol mit Salicylaldehyd oder o-Vanillin synthetisierten Liganden H21, bilden bei der stochiometrischen Umsetzung mit Mn(II)-acetatdihydrat die 1:1-Komplexe (I).

Adduct formation by sub-coordinated metal complexes—IV: Studies on the coordination of cyclic nitrogen bases with bis-(salycilaldoximate)-nickel(II)

Abstract Adducts of bis-(salicylaldoximate)-nickel(II), Ni(salox)2, with pyridine, picolines, cyclomethyleneimines are reported. Their formula is Ni(salox)2L2. The compounds are characterized by magnetic and spectrophotometric measurements. Solutions of Ni(salox)2 in each base are studied similarly. The adducts are hexacoordinate in solution or in the solid state, with pseudo-octahedral or D2h symmetry. The solution of Ni(salox)2 in 2-picoline is peculiar, showing a temperature dependent equilibrium between the adduct Ni(salox)2-(2picoline)2 and the parent complex.

A study of the nature and stability of the system uranyl-benzohydroxamic acid in acid medium

Abstract Spectrophotometric and conductometric measurements made in aqueous acid solutions containing UO22+ and benzohydroxamic acid (HB), show the formation of the complex ion UO2B+. The stability constant of this ion is 5·2 × 107 at 20°C and at ionic strength 1·0. The value of the stability constant shows that the complex ion is very stable at pH values between 2·3 and 2·8. The results confirm that under such experimental conditions protonic displacement from bezohydroxamic acid by the uranyl ion occurs HB + UO22+⇌UO2+H+.

Trimethylplatinum(IV) complexes with ON bidentate ligands

Abstract Complexes of the trimethylplatinum(IV) moiety with bidentate monobasic salicylaldimines C 6 H 5 (OH)CHNR (R = ethyl, propyl, phenyl) have been prepared and characterized by IR, UV and NMR spectra and magnetic susceptibility measurements. The complexes are dimeric with double PtOPt bridges, and the metal appears to be pseudo-octahedrally hexacoordinated.