Isatins polymers

Biisatin, 5.5 -methylenebiisatin, 5,5 -diisatylether, and 5,5 -diisatylketones have proved to be useful compounds for the preparation of polymers. A series of polyindophenines (216-219) have been prepared by reaction of these isatins with thiophene under acidic condi-... 

Calculations at the MP2/6-31G //MP2/6-31G level indicates that the C2h fully planar structure is about 8 kcal/mol more stable than the C2V perpendicular form (a transition state). Likewise, condensation reactions with isatins have suggested the involvement of the superelectrophile 86 (eq 21).40 This superelectrophilic chemistry has been successfully applied in the preparation of hyperbranched polymers and other macromolecules 40b d Other... 

Due to its ability to bind ferric ions, isatin-3-thiosemicarbazone can be used to form magneto-polymer composites with poly (vinyl chloride)... 

A simple look at indophenine reveals that it should have interesting electronic properties, particularly if incorporated in a polymer [3-6] The structure is actually more complicated than shown above, as determined in the recent past by Cava and co-workers [7] because of cis-trans isomerism around the double bonds between the thiophene rings and also the thiophene-to-isatin moieties. Indeed, in much more recent times, substituting 3,4-ethylenedioxythiophene for thiophene produced a small-bandgap, albeit insoluble, polymer [8]. 

Poly(indophenine)s [17] are prepared by reaction of isatin with thiophene (Figure 14) and have conductivities up to 10 S/cm without additional dopant. The polymers are soluble in dimethyl sulfoxide and can be cast as films the material is thermostable up to 230 °C [129]. 

Hyperbranched poly(aryl ether oxindole)s (hb-PAE-Oxns) with a DB of 100% were prepared by Fu et al. [176] from an isatin-based AB2 monomer (1—36, Scheme 12) by one-pot polymerization without using toxic organometaUics nor chromatographic purification. The hb-PAE-Oxns soluble in apolar solvents were able to encapsulate a hydrophilic dye from the same polymer. 

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