ISSN:
0025-116X
Schlagwort(e):
Chemistry
;
Polymer and Materials Science
Quelle:
Wiley InterScience Backfile Collection 1832-2000
Thema:
Chemie und Pharmazie
,
Physik
Notizen:
The crystal and molecular structure of an asymmetric diacetylene derivative, 6-(4-dimethylaminobenzoyloxy)-2,4-hexadiynyl 3,5-dinitrobenzoate (1), was determined from x-ray diffraction data. The crystals are monoclinic, P21/c with Z = 4 in a unit cell having dimensions, a = 11,116 (1) Å, b = 13,429 (2) Å, c = 14,672 (3) Å, β = 106,84 (6)°. The structure was solved by direct methods and refined by least-squares techniques to an RF of 6,2% for 1 991 independent reflections. The diacetylene backbone chains are almost perfectly parallel to the ac-plane; however, they are displaced from each other in the [010] direction. The solid-state polymerization mechanism is discussed with respect to the geometric disposition of the diacetylene chains, which in this crystal are too far apart to permit polymerization by means of 1,4-addition, consistent with the Baughman mechanistic model.
Zusätzliches Material:
3 Ill.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1002/macp.1986.021870921
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