Fujio Izumi

Infrared studies of the synergistic adducts of bis-(2-thenoyltrifluoroacetonato)metal(II)

Abstract Hexa-coordinate synergistic adducts of the type M (TTA) 2 (pyridine base) 2 , where M = Co(II), Ni(II), Cu(II) and Zn(II), TTA = 2-thenoyltrifluoroacetone and pyridine base = pyridine and γ-picoline, have been isolated and their I.R. spectra measured. The ν ( M O) frequencies of adducts in the 360–390 cm −1 region are metal-sensitive and decrease in the order: nickel(II) > cobalt(II) > copper(II) ≈ zinc(II), whereas the ν ( M N) order is copper(II) > nickel(II) > cobalt(II) ⪢ zinc(II). The strong M N bonds and the marked weakening of M O bonds in the copper(II) adducts are ascribed to the Jahn-Teller distortion.

Crystallization of γ-Bi2MoO6 under hydrothermal conditions

Abstract The hydrothermal synthesis of γ-Bi 2 MoO 6 was studied in H 2 O, LiCl, NaCl, KCl, NH 4 Cl, NaF, KF and HN 4 F solutions. The experimental conditions for the isothermal synthesis of γ-Bi 2 MoO 6 in these solutions have been determined. Moreover, for the first time, the growth of the single crystals of γ-Bi 2 MoO 6 was carried out in KF and NH 4 F solutions by the differential temperature method. The experimental conditions for the growth of the single crystals of γ-Bi 2 MoO 6 are reported in detail.

Extraction and spectrophotometric determination of copper(II) with 1,1,1-trifluoro-3-(2-thenoyl)acetone

Copper(II)-trifluorothenoylacetone complex in chloroform does not undergo decomposition when scrubbed with sodium hydroxide solution. This allows the complete removal of the residual reagent, and a highly sensitive method for the extraction and spectrophotometric determination of copper(II) results.

Hydrothermal crystallization of titanium(IV) oxide and oxofluorides of niobium(V) from hydrofluoric acid

Abstract The Groups IVA and VA metals in the highest oxidation state are well known to be typical hard acids and form their most stable complexes with F − ions(1). However, little is known about the chemical behavior of the fluoro-complexes in aqueous solution. The present communication deals with hydrolysis of the fluoro-complexes of Ti 4+ and Nb 5+ under high temperature and pressure. Emphasis is placed on the concentration effect of HF on the crystalline forms of hydrolysis products.

INFRARED AND MASS SPECTRAL STUDIES OF COMPLEXES OF BIS(HEXAFLUOROACETYLACETONATO)METAL(II) WITH 1,10-PHENANTHROLINE

Mixed ligand complexes of the type M(hfa)2phen were prepared and IR, DTA-TG and MS were measured in order to investigate the stabilities of these complexes. Exceptional properties were observed for the Cu(II) complex on IR and MS measurements. The marked weakening of Cu–O bonds in the Cu(II) adducts is ascribed to the Jahn–Teller effect.