ISSN:
0006-3525
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
Self-assembly patterns as a function of the central core insert in the retro bis-peptide dicarboxylic acids HO—Aib—X—Aib—OH, containing oxalyl (-CO—CO—1), fumaryl (— O—CH=CH —CO —;2), and adipoyl [— CO—(CH2)4 —CO—3], have been characterized by single crystal x-ray diffraction analyses. Extensive hydrogen bonding occurs in each crystal but there are no OH…O bonds between acid groups. Only two types of hydrogen bonds occur in all the crystals:NH…O (acid terminal),2.84-2.98 Åand OH (acidterminal)…O (corecarbonyl),2.55-2.67 Å (exceptfor an additional intramolecular C5 type bond in the oxalyl moiety in 1). The self-assembly patterns are a β-network in1, separate layer assemblies (β-networks) for two independent molecules in 2 that combine into a three-dimensional γnetwork, and separate ribbon assembles (αnetworks) for two independent molecules in 3 that combine into an extended β-network sheet withhydrophobic faces. © 1995 John Wiley & Sons, Inc.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/bip.360360307
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