Organo-metallic clay complexes

Abstract

Differential thermal analysis curves were obtained for a series of diamine and glycol complexes with natural and copper substituted montmorillonite, in air and in an inert atmosphere. Thermobalance curves of the diamine-clay systems were also determined. The exothermic peaks observed in air are characteristic for any particular system and reflect the nature and binding of the interlamellar material; no direct correlation was, however, observed with pyrolysis and oxidation processes in the clay. Organic matter is frequently liberated from the clay before oxidation, which then occurs within the reaction cell but outside the clay phase. The extent to which oxidation is completed at any particular temperature depends upon the supply of oxygen and the amount of organic material present.

Sorption of α-amino-acids by copper montmorillonite

“…Studies of the sorption of amines and catechols by montmorillonite containing exchangeable transition metal ions, particularly copper, showed that there is a strong tendency to complex formation in the clay interlayers (Bodenheimer et al, 1962;Bodenheimer, Kirson & Yariv, 1963;Bodenheimer, Heller & Yariv, 1963a, b, 1964, 1966a, b, 1967. Amines, particularly diamines, can be extracted by copper *Present address: Department of Geology, Hebrew University, Jerusalem.…”

The Effect of Dissolved Ligands on the Sorption of Cu(II) by Ca-Montmorillonite

“…Ligand competition for metal ions is always occurring, but this decreased adsorption can be compensated by other forms ofligand-metal-solid interactions: The formation of ternary complexes promotes metal adsorption at oxide minerals (Schindler and Stumm, 1987;Schindler, 1990). For clay minerals, an enhanced uptake of cationic metal-ligand complexes by ion-exchange as compared with the free metal ion has been reported (Bodenheimer et al, 1962(Bodenheimer et al, , 1963(Bodenheimer et al, , and 1966Cloos et al, 1972;Maes et al, 1978). This effect was interpreted as a stabilization of the metal-ligand complex by the interlayer phase as compared with the aqueous solution (Maes et al, 1978).…”

N‐n‐Alkylpyridinium Derivatives of Mica‐Type Layer Silicates

“…They have been extensively investigated by Bodenheimer and coworkers [5,6,7]. The second gr oup derivatives were reported for the first time by Smith and Hendricks [8,9] and consequently studied extensively .…”