Literatur vom gleichen Autor/der gleichen Autor*in
plus bei Google Scholar

Bibliografische Daten exportieren
 

Crystal Structure of Form I of Syndiotactic 1,2-Poly(4-methyl-1,3-pentadiene)

Titelangaben

Immirzi, Attilio ; Tedesco, Consiglia ; Valdo Meille, Stefano ; Famulari, Antonino ; van Smaalen, Sander:
Crystal Structure of Form I of Syndiotactic 1,2-Poly(4-methyl-1,3-pentadiene).
In: Macromolecules. Bd. 36 (2003) Heft 10 . - S. 3666-3672.
ISSN 1520-5835
DOI: https://doi.org/10.1021/ma0257853

Volltext

Link zum Volltext (externe URL): Volltext

Abstract

The crystal structure of the form I of syndiotactic 1,2-poly(4-methyl-1,3-pentadiene) has been determined studying the X-ray fiber diffraction pattern recorded onto a Fuji image plate. The chain conformation (T6G2T2G2), previously proposed by Meille et al. on the basis of the identity period, has been confirmed, but with deviations of chain torsion angles from the 60 and 180° values. The crystal system is triclinic, a = 17.513(8) Å, b = 9.117(6) Å, c = 11.251(14) Å, α = 95.20(4)°, β = 98.01(3)°, γ = 92.74(5)°, and V = 1768(3) Å3. The space group is P1̄, with two chains per cell, each formed by six nonequivalent CH2CH[CHC(CH3)2] chemical units. The crystal structure was determined and refined by the least-squares method, keeping bond lengths fixed and assuming that chemically equivalent bond angles are equal to each other. The refined model shows unrealistic values for some side group bond angles, in particular for the angle between methyl groups. Quite satisfactory results are obtained fixing this angle to the value of 122.7°, as suggested by searching the Cambridge Structural Database. Final disagreement indices are R1 = 14.3% and R2 = 15.0%.

Weitere Angaben

Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Institutionen der Universität: Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften > Lehrstuhl Kristallographie > Lehrstuhl Kristallographie - Univ.-Prof. Dr. Sander van Smaalen
Fakultäten
Fakultäten > Fakultät für Mathematik, Physik und Informatik
Fakultäten > Fakultät für Mathematik, Physik und Informatik > Fachgruppe Materialwissenschaften
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik > 530 Physik
Eingestellt am: 18 Mär 2016 08:22
Letzte Änderung: 27 Jul 2023 13:57
URI: https://eref.uni-bayreuth.de/id/eprint/31913