TY  - JOUR
A1  - Görl, Daniel
A1  - Zhang, Xin
A1  - Stepanenko, Vladimir
A1  - Würthner, Frank
T1  - Supramolecular block copolymers by kinetically controlled co-self-assembly of planar and core-twisted perylene bisimides
JF  - Nature Communications
N2  - New synthetic methodologies for the formation of block copolymers have revolutionized polymer science within the last two decades. However, the formation of supramolecular block copolymers composed of alternating sequences of larger block segments has not been realized yet. Here we show by transmission electron microscopy (TEM), 2D NMR and optical spectroscopy that two different perylene bisimide dyes bearing either a flat (A) or a twisted (B) core self-assemble in water into supramolecular block copolymers with an alternating sequence of (A\(_{m}\)BB)\(_{n}\). The highly defined ultralong nanowire structure of these supramolecular copolymers is entirely different from those formed upon self-assembly of the individual counterparts, that is, stiff nanorods (A) and irregular nanoworms (B), respectively. Our studies further reveal that the as-formed supramolecular block copolymer constitutes a kinetic self-assembly product that transforms into thermodynamically more stable self-sorted homopolymers upon heating.
KW  - cylindrical micelles
KW  - water
KW  - amplification
KW  - association
KW  - emission
KW  - organization
KW  - polymerization
KW  - dyes
KW  - fluorescent
KW  - aqueous medium
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-148657
VL  - 6
IS  - 7009
ER  - 
TY  - JOUR
A1  - Görl, Daniel
A1  - Soberats, Bartolome
A1  - Herbst, Stefanie
A1  - Stepanenko, Vladimir
A1  - Würthner, Frank
T1  - Perylene bisimide hydrogels and lyotropic liquid crystals with temperature-responsive color change
JF  - Chemical Science
N2  - The self-assembly of perylene bisimide (PBI) dyes bearing oligo ethylene glycol (OEG) units in water affords responsive functional nanostructures characterized by their lower critical solution temperature (LCST). Tuning of the LCST is realized by a supramolecular approach that relies on two structurally closely related PBI–OEG molecules. The two PBIs socially co-assemble in water and the resulting nanostructures exhibit a single LCST in between the transition temperatures of the aggregates formed by single components. This permits to precisely tune the transition from a hydrogel to a lyotropic liquid crystal state at temperatures between 26 and 51 °C by adjusting the molar fraction of the two PBIs. Owing to concomitant changes in PBI–PBI interactions this phase transition affords a pronounced color change with “fluorescence-on” response that can be utilized as a smart temperature sensory system.
KW  - perylene bisimide hydrogels
Y1  - 2016
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-162459
VL  - 7
IS  - 11
ER  -