scholarly journals Investigation on Mixed Complex. I. Spectrophotometric Study of Mixed Complexes Formed by Cupric Ion and Bidentate Ligands

1956 ◽  
Vol 29 (7) ◽  
pp. 805-811 ◽  
Author(s):  
Sigeo Kida
Keyword(s):  
Complex I ◽  
Spectrophotometric Study ◽  
Mixed Complex ◽  
Bidentate Ligands ◽  
Mixed Complexes ◽  
Cupric Ion

Potentiometric investigation of simple and mixed complexes of cupric ion in aqueous solution

1978 ◽  
Vol 27 ◽  
pp. 31-35 ◽  
Author(s):  
G. Arena ◽  
S. Musumeci ◽  
E. Rizzarelli ◽  
S. Sammartano
Keyword(s):  
Aqueous Solution ◽  
Mixed Complexes ◽  
Cupric Ion

99mTc-Labelled Compounds Prepared with Sodium Dithionite as Reducing Agent

1981 ◽  
Vol 20 (06) ◽  
pp. 283-289 ◽  
Author(s):  
M. Kalinčák ◽  
V. Macháň ◽  
Š. Vilček
Keyword(s):  
Complex I ◽  
Sodium Dithionite ◽  
Reducing Agent ◽  
Experimental Results ◽  
The Other ◽  
Mixed Complex ◽  
Complex Ii ◽  
Other Hand ◽  
Labelled Compound ◽  
Prepared Complex

The paper deals with the application of Na2S2O4 as reducing agent in the preparation of 99mTc-labelled compounds. The reduction of pertechnetate can advantageously be carried out in neutral solutions of pH 7. Using this procedure, DTPA, HEDSPA, MDP, gluconate, citrate and trypsin were successfully labelled. In HEDSPA and MDP labelling, a high as cumulation of 99mTc in rat bones (50%) was obtained. In gluconate labelling, under various reaction temperatures, two types of complexes were prepared. Complex I shows a 99mTc biodistribution which is comparable with the kidney diagnosticum 99mTc-Sn-gluconate (24% of 99mTc in kidneys). Complex II, on the other hand, exhibited a reduced affinity of 99mTc to kidneys (2.2%) which, however, increases in bone to 15.4%. The experimental results indicated that Tc(V) is bound in Complex I. In technetium complexing no "mixed complex" is formed, technetium being complexed directly by chelate-forming groups of the labelled compound.

FERRIC SULPHATE COMPLEXES, AND TERNARY COMPLEXES WITH THIOCYANATE IONS

1955 ◽  
Vol 33 (10) ◽  
pp. 1591-1602 ◽  
Author(s):  
M. W. Lister ◽  
D. E. Rivington
Keyword(s):  
Ionic Strength ◽  
Constant Temperature ◽  
Equilibrium Constants ◽  
Spectrophotometric Study ◽  
Ternary Complexes ◽  
Ferric Sulphate ◽  
Extinction Coefficients ◽  
Mixed Complexes

A spectrophotometric study of solutions containing ferric and sulphate ions, and also ferric, sulphate, and thiocyanate ions, is reported. The measurements were made at constant temperature and ionic strength; the effect of varying acidity was also investigated. The data were interpreted with the help of the results of the first paper of this series. It is believed that the data show that FeSO4+ and FeHSO4++ ions are formed. Values are obtained for the equilibrium constants for their formation from simple ions, and for their extinction coefficients. At higher sulphate concentrations there is evidence for the appearance of Fe(SO4)2− and FeSO4•HSO4, and estimates are made of their equilibrium constants. When thiocyanate is also present, the data can best be interpreted by assuming that the complex FeSO4•SCN is formed, and at higher sulphate probably also Fe(SO4)2SCN−−. Values are obtained for the equilibrium constants for the formation of these species, and the results would indicate that mixed complexes of this type are formed as readily as 'simple' ones such as Fe(SO4)2−.

Statistical criteria of stellar population types

1966 ◽  
Vol 24 ◽  
pp. 101-110
Author(s):  
W. Iwanowska
Keyword(s):  
Stellar Population ◽  
Chemical Properties ◽  
Spectrophotometric Study ◽  
Physical And Chemical Properties ◽  
Population Type ◽  
The Galaxy ◽  
Distribution Parameters ◽  
Physical And Chemical ◽  
Statistical Criteria ◽  
And Chemical Properties

In connection with the spectrophotometric study of population-type characteristics of various kinds of stars, a statistical analysis of kinematical and distribution parameters of the same stars is performed at the Toruń Observatory. This has a twofold purpose: first, to provide a practical guide in selecting stars for observing programmes, second, to contribute to the understanding of relations existing between the physical and chemical properties of stars and their kinematics and distribution in the Galaxy.

Sign in / Sign up

Export Citation Format

Share Document