Ionic oligomer

Manning GS. Counterion condensation on ionic oligomers. Physica 1997 247 196-204. 

Phosphorus(V) reagents may also be transformed to phosphoranimines. The reaction of CfPNPC j PC or PCfj with (MejSi)2NH provides the ionic oligomers Cf (PCf2 N) PC 3 PC in addition to cyclic and polymeric species in a process which can be followed by P NMR. The transformation of P(0)C 3 to C 2P(=NH)OSiR3 may be accomplished using the... 

Forss and Stenlund demonstrated electrostatic effects for ionic oligomers, namely a 2500 MW lignosulfate (12). In pure water, on Sephadex G-25, peak retention volumes increased dramatically with increased sample size, although elution always began shortly after Vq. Similar behavior for low MW salts has been pointed out (13). 

Saito N, Matsuda T. Protein adsorption on self-assembled monolayers with water-soluble non-ionic oligomers using quartz-crystal microbalance. Mater Sci Eng C 1998 6 261-6. 

Electrophoretic paints consist of ionic oligomers dispersed in an organic solvent and usually diluted with water to form an emulsion used for deposition. When cathodic current (for a cationic paint) is driven through a tip connected to a two-electrode cell containing the electropaint solution, the oligomers migrate to the tip and deposit on the surface due to reactions with the reduction... 

G. S. Manning and U. Mohanty, Physica A, 247, 196 (1997). Counterion Condensation on Ionic Oligomers. 

The Ni-catalyzed oligomerization of olefins in ionic liquids requires a careful choice of the ionic liquid s acidity. In basic melts (Table 5.2-2, entry (a)), no dimerization activity is observed. FFere, the basic chloride ions prevent the formation of free coordination sites on the nickel catalyst. In acidic chloroaluminate melts, an oligomerization reaction takes place even in the absence of a nickel catalyst (entry (b)). FFowever, no dimers are produced, but a mixture of different oligomers is... 

A related study used the air- and moisture-stable ionic liquids [RMIM][PFg] (R = butyl-decyl) as solvents for the oligomerization of ethylene to higher a-olefins [49]. The reaction used the cationic nickel complex 2 (Figure 7.4-1) under biphasic conditions to give oligomers of up to nine repeat units, with better selectivity and reactivity than obtained in conventional solvents. Recycling of the catalyst/ionic liquid solution was possible with little change in selectivity, and only a small drop in activity was observed. 

The membrane-bound preparation from kidney is easily solubilized in non-ionic detergent and analytical ultracentrifugation shows that the preparation consists predominantly (80 85%) of soluble af units with 143000 [28]. The soluble a)S unit maintains full Na,K-ATPase activity, and can undergo the cation or nucleotide induced conformational transitions that are observed in the membrane-bound preparation. A cavity for occlusion of 2K or 3Na ions can be demonstrated within the structure of the soluble a)S unit [29], as an indication that the cation pathway is organized in a pore through the aji unit rather than in the interphase between subunits in an oligomer. 

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