Molla Islam - Self-assembly of a set of hydrophilic-solvophobic-hydrophobic coil-rod-coil molecules based on perylene diimide.

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      Publication Details (including relevant citation   information): Islam, Molla R., Sundararajan, P. R.,   Phys. Chem. Chem. Phys., 2013,   15 (48), pp 21058-21069

      Abstract: The self-assembly and the resulting   morphol. of a set of asym. substituted perylene diimide is   discussed. We synthesized perylene diimides with hydrophilic   Jeffamine (PEO/PPO co-oligomer) attached to the imide nitrogen on   one side and (hydrophobic) alkyl chains of different lengths on   the other. Although studies on asym. substituted perylene   diimides have been reported by various authors, both side chains   in this work are linear and we discuss the effect of the length   of the hydrophobic alkyl side chain on the self-assembly in water   and aq. mixts. and the resulting morphol. We find that   self-assembly occurs in water in a range of concns. (from 10-7 to   10-4 M), and the mode of packing of the H-stacked mols. changes   with concn. for the Pr substitution. Although self-assembly does   not occur in non-aq. solvents such as acetone, it does upon addn.   of water. While other authors obsd. nano-belts and nano-fibers   with asym. substituted perylene diimides, the morphol. of   drop-cast films in our work consists of folded sheets and hollow   tubes, of a few microns in diam. Such folding in a non-chiral   system such as the present case is attributed to predominant   asymmetry of interactions between the mols. in the three   directions, as we discussed in our previous work on an hydrogen   bonded system. [on SciFinder(R)]

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