Charge distribution chelates

They prevent redeposilion of soils removed from a surface back onto ihe surface through a dispersing action associated with chelating and charge-distribution effects. 

A related study by Yamazaki et al. investigated the reaction profile of the SnCLj-catalyzed [2+1] cycloaddition of l-seleno-2-silylethenes to 2-phosphonoacrylates . Calculations at the HF level suggest that the crucial intermediate for this reaction is the chelate complex which is shown in Figure 48. The authors give the optimized geometries, energies and charge distribution of the complex and other possible intermediates of the reactions . ... 

The shape, size, and charge distribution of the two possible conformations (24) and (25) are significantly different thus influencing chelating and binding properties. 

A quantitative modeling study of geometrical prerequisites and charge distribution in SYBYL supports the formation of a chelation complex between potassium ion, the nitro group, and a... 

Anthocyanins at low pH ranges exist mainly in the form of flavylium cations and because of the charge distribution, they are susceptible to nucleophilic attack on positions 2 and 4 [166], According to this and based on spectral shift studies, it has been postulated that the hydroxylation of an anthocyanin at these positions enhances its chelating ability [167], Fig. (7). 

The microstructure of the polybutadiene and polyisoprene produced by anionic polymerization is correlated to the structure of the allylic anion of the active chain end. The charge distribution over this anion is affected greatly by changing counterions, the use of solvating solvents, and the presence of cation chelating additives. 

Figure 6.1 Formation of alkoxysilanes complexes with chelating ligands, causing increased charge distribution on formation of a chelate cycle and increase in the coordination number [25].

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