Cooperative helical order in optically active poly(diarylsilylenes)

Macromolecules

Volumn 34, Issue 4, 2001, Pages 1082-1089

  Koe, Julian R ^a   Fujiki, Michiya ^a   Motonaga, Masao ^b   Nakashima, Hiroshi ^a  

^a NTT Basic Research Laboratories   (Japan)

^b JAPAN SCIENCE AND TECHNOLOGY AGENCY   (Japan)

Author keywords

[No Author keywords available]

Indexed keywords

CONFORMATIONS; OPTICAL ROTATION; PHOTOCHROMISM; ULTRAVIOLET SPECTROSCOPY; VISCOSITY MEASUREMENT;

COTTON EFFECTS;

COPOLYMERS;

EID: 0035251181     PISSN: 00249297     EISSN: None     Source Type: Journal    
DOI: 10.1021/ma001126j     Document Type: Article

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71. 8a at 20°C, the CD band of 8 approximately coincident with the UV absorption at 395 nm is essentially negative, although a small, positive, longer wavelength band was apparent. At lower temperature, a new band in the UV spectrum was noted at about 320 nm. Further variable temperature CD/UV experiments down to -70°C on this sample indicate a relative decrease of the intensity of the negative Cotton effect compared with that of the positive Cotton effect. Thus, at -10°C, two CD bands, one positive and one negative, are apparent, values for both of which are given in Table 1. The half-height line widths in the TJV spectrum at -10°C are not determinable due to the shape of the peaks.