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• W2135332521 endingPage "404" @default.
• W2135332521 startingPage "388" @default.
• W2135332521 abstract "Abstract A series of functional iodoacetylenes was prepared and converted into the corresponding diacetylene‐substituted amino acids and peptides via Pd/Cu‐promoted sp–sp carbon cross‐coupling reactions. The unsymmetrically substituted diacetylenes can be incorporated into oligopeptides without a change in the oligopeptide strand's directionality. Thus, a series of oligopeptide‐based, amphiphilic diacetylene model compounds was synthesized, and their self‐organization as well as their UV‐induced topochemical polymerizability was investigated in comparison to related polymer‐substituted macromonomers. Solution‐phase IR spectroscopy, gelation experiments, and UV spectroscopy helped to confirm that a minimum of five N‐H⋅⋅⋅OC hydrogen‐bonding sites was required in order to obtain reliable aggregation into stable β‐sheet‐type secondary structures in organic solvents. Furthermore, the non‐equidistant spacing of these hydrogen‐bonding sites was proven to invariably lead to β‐sheets with a parallel β‐strand orientation, and the characteristic IR‐spectroscopic signatures of the latter in organic solution was identified. Scanning force micrographs of the organogels revealed that compounds with six hydrogen‐bonding sites gave rise to high aspect ratio nanoscopic fibrils with helical superstructures but, in contrast to the related macromonomers, did not lead to uniform supramolecular polymers. The UV‐induced topochemical polymerization within the β‐sheet aggregates was successful, proving parallel β‐strand orientation and highlighting the effect of the number and pattern of N‐H⋅⋅⋅OC hydrogen‐bonding sites as well as the hydrophobic residue in the molecular structure on the formation of higher structures and reactivity." @default.
• W2135332521 created "2016-06-24" @default.
• W2135332521 creator A5028960413 @default.
• W2135332521 creator A5073393533 @default.
• W2135332521 creator A5080562655 @default.
• W2135332521 creator A5082300184 @default.
• W2135332521 creator A5084845099 @default.
• W2135332521 date "2008-12-22" @default.
• W2135332521 modified "2023-10-18" @default.
• W2135332521 title "Synthesis of Diacetylene-Containing Peptide Building Blocks and Amphiphiles, Their Self-Assembly and Topochemical Polymerization in Organic Solvents" @default.
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