Conformational Studies on an Optically Active 1,4-Polyketone in Solution

Conformation of a chiral γ-polyketone, poly((S)-1-oxo-2-methyltrimethylene) (1), in solution was investigated by CD and ORD spectropolarimetry and static light scattering refractometry. Variable-temperature CD and ORD spectra of 1 as compared with that of a chiral diketone (S)-3-methyl-2,5-hexanedio...

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Bibliographic Details
Published in:Macromolecules 2003-09, Vol.36 (18), p.6884-6887
Main Authors: Kosaka, Naoyuki, Nozaki, Kyoko, Hiyama, Tamejiro, Fujiki, Michiya, Tamai, Nobutake, Matsumoto, Takayoshi
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Properties and characterization
Solution and gel properties
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Summary:Conformation of a chiral γ-polyketone, poly((S)-1-oxo-2-methyltrimethylene) (1), in solution was investigated by CD and ORD spectropolarimetry and static light scattering refractometry. Variable-temperature CD and ORD spectra of 1 as compared with that of a chiral diketone (S)-3-methyl-2,5-hexanedione (3), a model compound of 1, afforded no evidence of polyketone 1 forming stable helical conformation. Static light scattering refractometry showed M w value of 1 was 18 800, smaller than M w 27 600 measured by GPC, indicating the existence of an extended conformation. The number-average root-mean-square radius of gyration R g,n is evaluated to be 9.94 nm by static light scattering.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma025979i