๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Raman and reflection spectra of a polymorph of the polydiacetylene TCDU

โœ Scribed by M.E. Morrow; R.C. Dye; C.J. Eckhardt

Publisher
Elsevier Science
Year
1989
Tongue
English
Weight
417 KB
Volume
158
Category
Article
ISSN
0009-2614

No coin nor oath required. For personal study only.

โœฆ Synopsis

The 298 K Raman and reflection spectra of a single crystal TCDU polydiacetylene polymorph (TCDU-A') are presented. The lowest energy reflection maximum in TCDU-A* is seen at 15900 cm-'. Raman and reflection spectra ofTCDU-A* are similar to those for TCDU-A and thin film TCDU samples and significantly different from TCDU-B spectra. It is suggested that TCDU-A* is a stable form of TCDU-A at ambient conditions and may also be the corresponding bulk form of the thin film TCDU.

๐Ÿ“œ SIMILAR VOLUMES

Single-crystal reflection and Raman spec
Single-crystal reflection and Raman spectra of the polydiacetylene THD
โœ M.E. Morrow; K.M. White; C.J. Eckhardt; D.J. Sandman ๐Ÿ“‚ Article ๐Ÿ“… 1987 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 572 KB

The 298 K Raman and reflection spectra of the polydiacetylene THD, a close structural variant of DCHD, are presented. The polymer double-and triple-bond stretch frequencies are 1485 and 21 I 1 cm-', respectively, and the lowest electronic transition peaks at 17600 cm-'. The reflection spectrum is mo

Piezomodulated reflection spectra of the
Piezomodulated reflection spectra of the polydiacetylenes DCHD and THD
โœ M.E. Morrow; C.J. Eckhardt ๐Ÿ“‚ Article ๐Ÿ“… 1988 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 490 KB

Analysis of vibronic structure in the 300 K piezomodulated reflection (PMR) spectra of DCHD and THD indicates the presence of a single allowed electronic state accompanied by significant hot band activity. Observed vibronic progressions and hot bands are consistent with corresponding Raman spectra.

Temperature-dependent Raman spectra of p
Temperature-dependent Raman spectra of polydiacetylene single crystals excited in the near infrared
โœ C. Engert; A. Materny; W. Kiefer ๐Ÿ“‚ Article ๐Ÿ“… 1992 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 442 KB

Raman spectra of the black polydiacetylene single crystals TS6 and TS/FBS were recorded by means of a conventional Raman spectrometer with excitation in the near-infrared spectral region. We observed several sidegroup vibrations below 900 cm-' additional to the four strong vibrational modes which mo

Statistical analysis of differences in t
Statistical analysis of differences in the Raman spectra of polymorphs
โœ Mehrens, Shawn M. (author);Kale, Uma J. (author);Qu, Xianggui (author) ๐Ÿ“‚ Article ๐Ÿ“… 2005 ๐Ÿ› John Wiley and Sons Inc. ๐ŸŒ English โš– 125 KB ๐Ÿ‘ 1 views

Raman spectroscopy is a useful tool for identifying polymorphs of pharmaceutical compounds. One limitation of the technique is that the small differences in Raman spectra require confirmation of polymorphs by other methods. Fourteen compounds, both commercial and proprietary pharmaceutical compounds