Search results for "Self ordering"

showing 2 items of 2 documents

Self-Ordering Secondary Structure of d- and l-Arginine-Derived Polyamidoamino Acids

2017

This paper reports on synthesis, acid–base properties and pH-dependent structuring in water of d-, l- and d,l-ARGO7, bioinspired polymers obtained by polyaddition of the corresponding arginine stereoisomers with N,N′-methylenebis(acrylamide). The circular dichroism spectra of d- and l-ARGO7 showed a peak at 228 nm and quickly and reversibly responded to pH changes, but were nearly unaffected by temperature, ionic strength, and denaturating agents. Theoretical modeling studies of L-ARGO7 showed that it assumed a folded structure. Intramolecular interactions led to transoid arrangements of the main chain reminiscent of the protein hairpin motif. Torsion angles showed a quite similar distribut…

Materials Chemistry2506 Metals and AlloysMaterials scienceArgininePolymers and PlasticsStereochemistry02 engineering and technologyOrganic Chemistry; Polymers and Plastics; Inorganic Chemistry; Materials Chemistry2506 Metals and Alloys010402 general chemistry01 natural sciencesSpectral lineInorganic Chemistrychemistry.chemical_compoundMaterials ChemistryProtein secondary structurechemistry.chemical_classificationOrganic ChemistryPolymer021001 nanoscience & nanotechnology0104 chemical scienceschemistryChiral polymers polyamidoamino acids interpenetrating peptides self-structured polymersIonic strengthIntramolecular forceAcrylamide0210 nano-technologySelf ordering
researchProduct

Self-ordering of metallogrid complexes via directed hydrogen-bonding.

2012

Reaction of imidazole aldehydes with dihydrazino derivatives of 2-phenylpyrimidine provides a family of bis(acylhydrazone) ligands which form [2 × 2] metallogrid complexes with transition metal ions including Fe(II), Co(II), Cu(II) and Zn(II). The free ligands show H-bonding interactions, both donor and acceptor, largely involving the imidazole units, while binding of the metal ions occupies all the acceptor sites and leaves only the pyrrolic-NH site as an H-bond donor, although its deprotonation by a strong base can regenerate an acceptor. These H-bonding interactions have been studied by (1)H NMR spectroscopy in solution and in the solid state by means of several crystal structure determi…

Models MolecularAldehydesMolecular StructureHydrogen bondMetal ions in aqueous solutionHydrazonesImidazolesHydrogen BondingCrystal structureAtmospheric temperature rangePhotochemistryLigandsAcceptorInorganic Chemistrychemistry.chemical_compoundCrystallographyDeprotonationchemistryOrganometallic CompoundsTransition ElementsImidazoleta116Self orderingDalton transactions (Cambridge, England : 2003)
researchProduct