Two polyaspartates bearing ortho-fluorinated azobenzenes (pFAB) as photo-responsive groups in the side chain were synthesized: PpFABLA (1) and co-polyaspartate PpFABLA-co-PBLA [11, 75%(n/n) content]. As a consequence of E/Z-isomerization chain, undergoes visible-light-induced reversible coil-helix transition solution: Green light (525 nm) affords coil, violet (400 helix. pFAB significantly increases thermal stability Z-isomer at 20 °C (t1/2 = 66 d for Z-isomer) effectively counters favored...

Specifically designed cuvette holders enable the artefact-free measurement of circular dichroism thin layer and volatile anisotropic solutions by averaging 4 sample orientations. The setup further allows for insertion permanent magnets.

Syntheses of multifunctional polymers aim to engineer a wide range material properties by adjusting the composition and positioning functional groups. While manifold syntheses side-chain-functionalized are known, synthetic protocols for main-chain-functionalized less common. This work describes general one-pot strategy prepare containing multiple moieties in their main-chain, e.g., azobenzene units separated variable oligomers. The polymerization proceeds two steps, starting from single...

A series of poly-β-benzyl-l-aspartate-co-poly-β-phenethyl-l-aspartates varying in their copolymer composition as well with selectively introduced deuterium labels the backbone or side-chain were synthesized and temperature-dependent conformation orientation respect to an external magnetic field characterized by measuring 2H quadrupolar splittings [nuclear resonance (NMR) spectroscopy] circular dichroism. All copolymers demonstrate a change helical from right-handed left-handed (helix...

Herein, we report the preparation of lyotropic liquid crystalline (LLC) phases poly-β-benzyl-l-aspartate (PBLA), a polymer that has not been known to form LLC before. Compared other l-configured polypeptides usually forming right-handed helices, PBLA forms left-handed helices. The phase behavior was observed for in specific range molecular weights, exclusively. Living polymerization allowed this excellent control over weight. Furthermore, used as host matrix two chiral...

The application of anisotropic parameters in NMR-spectroscopy enables the acquisition spatial and angular information, complementary to those from conventional isotropic NMR-measurements. use alignment media is a well-established method for inducing anisotropy. PBPMLG recently discovered polyglutamate-based medium, exhibiting thermoresponsive behavior lyotropic liquid crystalline (LLC) phase, thus offering potential deeper understanding process. We present one approach investigating by...

The ring-opening copolymerization (ROcoP) of epoxides and anhydrides is exploited to afford 4 structurally diverse functional copolyesters. Mixtures 2 (allyl glycidyl ether butylene oxide) with 1 anhydride (succinic, glutaric, phthalic homo anhydride) are copolymerized in the presence bis(triphenylphosphine)iminium chloride (PPNCl) as organocatalyst. All monomer combinations yield vinyl-functionalized materials alternating epoxide-anhydride units, statistical incorporation both along polymer...

The polyester synthesis from anhydrides and epoxides requires their strictly alternating incorporation achieved by a catalyst that is capable of mediating the reactivity carboxylate alcohol chain ends.

Abstract A supramolecular, lyotropic liquid crystalline alignment medium based on an azobenzene‐containing 1,3,5‐benzenetricarboxamide (BTA) building block is described and investigated. As we demonstrate, this water‐based system suitable for the investigation of various water‐soluble analytes allows a scaling strength through variation temperature. Additionally, shown to reversibly collapse above certain temperature, yielding isotropic solution. This reference measurements, which are...

Abstract The application of anisotropic parameters in NMR‐spectroscopy enables the acquisition spatial and angular information, complementary to those from conventional isotropic NMR‐measurements. use alignment media is a well‐established method for inducing anisotropy. PBPMLG recently discovered polyglutamate‐based medium, exhibiting thermoresponsive behavior lyotropic liquid crystalline (LLC) phase, thus offering potential deeper understanding process. We present one approach investigating...

In nature, proteins like rhodopsin act as transducer for photo-chemical reactions causing biological responses (e.g. enabling vision) . The underlying concept – a photo-induced conformational change of the protein amplifier photo-responsive moiety can also be adopted by synthetical polymers or foldamers that have propensity to form ordered secondary structures polypeptides) An alternative approach amplify is their incorporation into liquid crystals With only few exceptions ,...

<p><b>In nature, proteins like rhodopsin act as transducer for photo-chemical reactions causing biological responses (e.g. enabling vision)</b><b>. The underlying concept – a photo-induced conformational change of the protein amplifier photo-responsive moiety can also be adopted by synthetical polymers or foldamers</b><b> </b><b>that have propensity to form ordered secondary structures polypeptides)</b><b>. An alternative approach...