Kuniko Yamanouchi

Dioxomolybdenum(VI) complexes with schiff bases obtained from salicylaldehyde derivatives and polymethylenediamines

New dioxomolybdenum(VI) complexes have been synthesized with quadridentate Schiff bases derived from salicylaldehyde derivatives and polymethylenediamines. On the basis of infrared and proton magnetic resonance spectra, it is concluded that the MoO2 group in them has cis structure, in which the quadridentate bis(salicylaldehyde)polymethylenediiminates assume non-planar coordination instead of planar one.

Copper (II) complexes with a subnormal magnetic moment

In the course of the study about copper(II) complexes of Schiff bases of type I1 obtained from salicylaldehyde derivatives and alkanol amines, we have isolated some interesting compounds, which have a subnormal magnetic moment.

Oxomolubdenum complexes with schiff bases obtained from salicylaldehyde derivatives and alkyl- and aryl-amines

Abstract With N-alkyl- and N-aryl-salicylaldiminates (abbreviated as X-Sal-R) as ligands, new molybdenum (V) and molybdenum(VI) complexes of the following three types have been synthesized by reactions of dioxobis(ring-substituted salicylaldehydato)molybdenum(VI) with various alkyl- and aryl-amines: (1) MoO 2 (X-Sal_R) 2 , yellow; (2) MoO 2 (X-Sal-R), red; (3) Mo 2 O 3 (H-Sal_R) 4 , purple. Infrared spectra indicate that the complexes of type (1) are six-coordinate with a cis-MoO 2 group. The complexes of type (2) are considered to be multinuclear molybdenum(V) complexes. The complex of type (3), which shoes a characteristic UV spectrum, is similar to the acetylacetonato analogue, and is possibly binuclear with one oxygen atom as a bridge.

Dioxotungsten(Vl) complexes with neutral schiff bases as ligands

Abstract The reaction of WO 2 Ct 2 with various N-arylsalicylaldimines (abbreviated as (Sal-R)H) has yielded tungsten(VI) complexes of the type WO 2 Cl 2 [(Sal-R)H] 2 It is very likely that these complexes involve the neutral Schiff bases, which are coordinated as unidentate ligands to tungsten(VI) ion. Infrared spectra indicate that the tungstenyl group WO 2 2+ in these complexes has a cis-configuration.

Oxotungsten(VI) complexes with schiff bases obtained from salicylaldehyde and various amines

Oxotungsten(VI) complexes have been synthesized with bi-, ter- and quadri-dentate Schiff bases obtained from salicylaldehyde and various amines. The following types of complexes have been isolated: (1) WOCl3 (bidentate); (2) WOCl2(terdentate); (3) WO2(terdentate); (4) WO2(terdentate). L, L being N,N-dimethylformamide (DMF) and pyridine (py). With quadridentate N,N′-ethylenebis(salicylaldiminate), WOCl3(quadridentate)12 has been obtained. Results of infrared spectra and electronic spectra are presented and possible structures of these complexes are discussed.

Metal complexes with schiff bases obtained from salicylaldehyde derivatives and 2-aminoethylpyridine

Abstract Cobalt(II), cobalt(III), nickel(II), copper(II) and palladium(II) complexes with N-2-(2-pyridyl)ethylring-substituted salicylideneiminates (abbreviated as X-Sal-2-Epy) were synthesized. In addition to Co III (H-Sal-2-Epy) 3 , the complexes of the formula M II (X-Sal-2-Epy) 2 ·nH 2 O were obtained in crystals. The cobalt(III) complex is diamagnetic and has an electronic absorption spectrum typical of the six-coordinate, octahedral cobalt(III) complex. The cobalt(II) complexes in the solid state show electronic spectra typical of the six-coordinate cobalt(II) complexes. Electronic spectra also indicate that the nickel(II) complexes in the solid state and in non-donor solvents are six-coordinate, octahedral. In the cobalt(II) and nickel(II) complexes, the ligand X-Sal-2-Epy functions as terdentates, while in the cobalt(III) complex it acts as a bidentate ligand. The results are compared with those reported previously for related ligands.

Synthesis of Lanthanide (III) Complexes with N-t-Butylsalicylideneiminate

Abstract Lanthanide(III) complexes with N-t-butylsalicylideneiminate (abbreviated as H-SAL.t-C4H9) have been synthesized as yellow crystals by the reaction of several lanthanide(III) chloride hydrates and the Schiff base. The complexes obtained, which were purified by recrys tallization from appropriate organic solvents, are represented by the formula In(H-SAL. t-C4H9)3.3H2O, where the notation Ln denotes tervalent La, Pr, Nd, Gd, Yb, and Lu.

Synthesis and characterization of niobium(V) and tantalum(V) complexes with neutral schiff bases as ligands

Abstract The reactions of niobium and tantalum pentachlorides and oxotrichlorobis(triphenylphosphine oxide)niobium(V) with N-arylsalicylaldimines, abbreviated as (Sal-R)H, have yielded new niobium(V) and tantalum(V) complexes of the following three types:(1) MCl 3 (OR′) 2 [(Sal-R)H]; (2){M(NCS) 2 (OC 2 H 5 ) 2 [(Sal-R)H]} 2 O; (3)NbOCl 3 [(Sal-R)H] 2 (M = Nb, Ta; R′ = CH 3 , C 2 H 5 ). They are light-yellow to yellow-orange, air-stable crystalline materials and are decomposed rapidly in solutions. On the basis of physical measurements, it is postulated that these complexes assume a six-coordinate structure involving the neutral Schiff base, which is coordinated as a unidentate ligand through an oxygen atom. Possible structures of these complexes are discussed mainly on the basis of pmr and infrared spectra.