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Study of diethyl 3,12‐diaza‐4,11‐dioxotetradecanedioate as a model compound of poly(ester amide)s derived from glycine
Author(s) -
Urpí Lourdes,
RodríguezGalán Alfonso,
Puiggalí Jordi
Publication year - 1998
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/(sici)1521-3935(19980601)199:6<1167::aid-macp1167>3.0.co;2-1
Subject(s) - monoclinic crystal system , chemistry , crystallography , amide , molecule , glycine , crystal structure , stereochemistry , polymer chemistry , organic chemistry , amino acid , biochemistry
The conformation of the molecule of diethyl 3,12‐diaza‐4,11‐dioxotetradecanedioate (EtGSGEt) has been investigated in the crystalline state by X‐ray analysis. EtGSGEt crystallizes in the monoclinic system, space group P112 1 /n with a = 4.8174(7) Å, b = 4.9008(5) Å, c = 43.616(5) Å and γ = 112.854(10)°. 965 independent reflections were used in the refinement to the final agreement factor of R = 8.36%. The glycine residues of EtGSGEt are related by an inversion center and adopt a conformation, which slightly deviates from that characteristic of the polyglycine II structure. An all‐ trans conformation was deduced for the suberamide unit. The packing characteristics of the diamide are similar to that found in the α form of nylons.