Tomorrow's Chemistry Today: Concepts in Nanoscience, Organic by Bruno Pignataro

By Bruno Pignataro

Supplying a glimpse into the longer term, the younger scientists contributing the following have been thought of to be crucial for tomorrow's chemistry and fabrics technology. They current the state-of-the-art of their specific fields of analysis, with themes starting from new artificial pathways and nanotechnology to eco-friendly chemistry.Of significant curiosity to natural chemists, fabrics scientists and biochemists.

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This ligand exchange appears to have been sterically driven: the substitution of one of the encumbering di(imine) ligands for a less bulky biquinoline provided the driving force for this reaction [45]. 18) did not undergo ligand substitution with the copper(I) bis(biquinoline) complex, possibly as a result of the different steric properties of the two complexes. 18). 17 Covalent (above) and coordinative (below) rearrangements of complex 17 to give 18 and 20, driven by pKa differences and sterics, respectively.

The entire sequence could be carried out in the same reaction flask, and the yields of the individual displacement reactions were close to those predicted using the Hammett equation. The driving force for the last displacement, as well as part of the first, is entropic in nature, and may be considered as a special case of the chelate effect [46]. 3 Helicate Reconfigurations The dicopper double-helicate moiety [31] has exhibited rich and varied substitution chemistry, as discussed below [17, 28, 46].

3 Helicate Reconfigurations The dicopper double-helicate moiety [31] has exhibited rich and varied substitution chemistry, as discussed below [17, 28, 46]. It is more rigid and structurally betterdefined than the mononuclear complexes discussed above, which allows one to use it as a persistent, well-defined tecton [13]. 18) also works well in the context of helicates. 21, helicate 24 was transformed into 3 upon the addition of sulfanilic acid. 21. Two distinct hierarchical layers of control over subcomponent substitution may thus be employed in tandem, based upon pKa differences and the chelate effect.

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