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Study of 1,4-bis(propylaminomalonylamino)butane as a model compound for nylons n,3

✍ Scribed by Eloísa Navarro; Jordi Puiggalí; Juan A. Subirana

Publisher: John Wiley and Sons
Year: 1995
Tongue: English
Weight: 460 KB
Volume: 196
Category: Article
ISSN: 1022-1352
DOI: 10.1002/macp.1995.021960722

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✦ Synopsis

Abstract

We are presently studying n,3 nylons, which have an unusual hydrogen bonding system. In order to determine their structure with greater precision, we have synthesized and determined by X‐ray diffraction the structure of a dimer of the repeating unit of nylon 4,3, namely, 1,4‐bis(propylaminomalonylamino)butane (pMBMp). This compound crystallizes in the triclinic system, space group __P__1 with a = 4,65, b = 4,91, c = 24,47 Å; α = 85,3, β = 89,7 and γ = 61,9°. The malonyl residues of pMBMp are related by an inversion center, with torsional angles about the methylene bonds of each malonyl residue in the range 110–115° (or the equivalent negative values). A. conformation TS̄(T)~3~ST was found for the butylenediamide unit. These results give support to the crystalline structure proposed for nylons n,3.

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