HPLC Characterization of Ag+and Cu+Metal Exchange Reactions with Zn- and Cd-Metallothioneins†

Biochemistry ◽  
1996 ◽  
Vol 35 (44) ◽  
pp. 13937-13945 ◽  
Author(s):  
Hong Li ◽  
James D. Otvos
Keyword(s):  
Metal Exchange ◽  
Exchange Reactions

Understanding and Practical Use of Ligand and Metal Exchange Reactions in Thiolate-Protected Metal Clusters to Synthesize Controlled Metal Clusters

2017 ◽  
Vol 17 (5) ◽  
pp. 473-484 ◽  
Author(s):  
Yoshiki Niihori ◽  
Sakiat Hossain ◽  
Sachil Sharma ◽  
Bharat Kumar ◽  
Wataru Kurashige ◽  
...  
Keyword(s):  
Metal Clusters ◽  
Metal Exchange ◽  
Exchange Reactions

Influence of Exchanged Surfactant on the Structure and Adsorption Properties of Brazilian Green Mud Clay

2012 ◽  
Vol 727-728 ◽  
pp. 1473-1478
Author(s):  
Mariaugusta Ferreira Mota ◽  
Fabricio Machado ◽  
Meiry Glaúcia Freire Rodrigues
Keyword(s):  
Ammonium Chloride ◽  
Basal Spacing ◽  
Natural Clay ◽  
X Ray Diffraction ◽  
Exchange Reactions ◽  
X Ray ◽  
Dimethyl Benzyl ◽  
Dimethyl Benzyl Ammonium ◽  
Green Clay

This work presents an experimental study focusing on the preparation and characterization of modified natural green clay-mud with quaternary ammonium salts of chloride and alkyl dimethyl benzyl ammonium chloride (Dodigen) and dimethyl stearyl ammonium chloride (Praepagen). X ray Diffraction (XRD), infrared spectroscopy (IR) and expansion tests (adsorption capacity and Foster swelling) measurements were performed in order to evaluate the performance of the ion exchange reactions and the degree of affinity with oil products. It is observed an increasing in the XRD basal spacing of the modified clays (1.96 nm and 2.25 nm for Praepagen and Dodigen salts, respectively) in comparison to the observed value (1.56 nm) for the natural clay. The IR results showed that salts were successfully incorporated to natural clay structure. Based on the expansion tests the organoclays presented the best efficiency independent on the kind of solvent used in comparison with the natural clay performance.

Ligand- and metal-exchange reactions on substituted lacunary heteropolytungstates

1983 ◽  
Vol 22 (8) ◽  
pp. 1198-1202 ◽  
Author(s):  
Frans Zonnevijlle ◽  
Claude M. Tourne ◽  
Gilbert F. Tourne
Keyword(s):  
Metal Exchange ◽  
Exchange Reactions

Applications of Cd N.M.R to Polycadmium Complexes. III. Effects of Zn/Cd and of Se/S Substitution in the Tetra-Adamantanoid Cage [S4Cd10(Sph)16]4- in Relation to Heterometal Metallothioneins

1985 ◽  
Vol 38 (12) ◽  
pp. 1745 ◽  
Author(s):  
IG Dance
Keyword(s):  
Chemical Shift ◽  
Metal Exchange ◽  
High Symmetry ◽  
Structural Elements ◽  
Structural Components ◽  
Exchange Reactions ◽  
Cage Compounds ◽  
Zn Substitution ◽  
Metal Atoms ◽  
Se Substitution

Cadmium-113 n.m.r . spectra at 66.6 MHz of various mixtures of the six cage compounds [X4M10( SPh )16]4- (1; X = S, Se; M = Zn, Cd ) and [M4( SPh )10]2- (M = Zn, Cd ), have revealed the exchange reactions of M and of X which occur within the different structural elements of (1), namely the triply bridging chalcogenide ligands X, the inner metal atoms Mi, and the outer metal atoms Mo. At laboratory temperature the exchange time scales range from days (X) through hours (Mi) to seconds (Mo and SPh ), according to the extent of atomic connection to each of these structural components of the aggregate. Metal exchange does not always follow random statistics, with biases towards equilibrium association of the same metal. The M- and X-substituted products, with lower symmetry than the high-symmetry precursors, reveal the mutual influences of the various structural elements on Cd chemical shift: S → Se substitution causes changes ( ΔδCd ) of -37 ppm at one bond, -3 ppm and -1.5 ppm at three bonds, and + 1 ppm five bonds distant; Cd → Zn substitution causes δCd to change by + 13 ppm and + 5 ppm at a connection of two bonds and by -3 ppm over four bonds. These effects of adjacent Cd → Zn substitution on δCd provide well defined models in support of the hypothesis of similar effects in the Cd n.m.r . spectra of mixed Zn, Cd metallothionein proteins.

Metal exchange reactions between uranyl-18-crown-6 complex and sodium ion in propylene carbonate

1988 ◽  
Vol 27 (1) ◽  
pp. 206-208 ◽  
Author(s):  
Pierre Fux ◽  
Janine Lagrange ◽  
Philippe Lagrange
Keyword(s):  
Propylene Carbonate ◽  
Sodium Ion ◽  
Metal Exchange ◽  
Exchange Reactions
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