𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Phase transition and stability of thiourea:diethyloxalate (2:1) complex

✍ Scribed by T. Sakuntala; R. Chitra; Rekha Rao; S. Thomas; Sugandhi Venkateswaran; R. R. Choudhury; A. K. Tyagi; S. K. Deb

Publisher
John Wiley and Sons
Year
2006
Tongue
English
Weight
716 KB
Volume
37
Category
Article
ISSN
0377-0486

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The Raman spectrum of the crystalline complex thiourea:diethyloxalate (2:1) is reported. The Raman wavenumbers in the complex are compared with those of crystalline thiourea (TU) and diethyloxalate (DEO), and the observed differences are understood from the point of view of the hydrogen bonding in the system. From the wavenumbers of the Nο£ΏH stretching vibrations, it is inferred that the strengths of hydrogen bonds in the complex are smaller compared to those in TU. The evolution of the Raman spectrum at high temperature reveals that the Nο£ΏHΒ·Β·Β· O hydrogen bonds, which are a key to the formation of the complex, are broken above 397 K. The spectrum corresponding to the crystalline complex reappears below 375 K when cooled from temperatures below melting. Copyright Β© 2006 John Wiley & Sons, Ltd.

πŸ“œ SIMILAR VOLUMES

Neutron inelastic scattering spectra and
Neutron inelastic scattering spectra and phase transition of 1,2-dichloroethane crystal
✍ A. Ozora; M. Ito; N. Niimura; N. Watanabe πŸ“‚ Article πŸ“… 1973 πŸ› Elsevier Science 🌐 English βš– 268 KB

Neut:on inelastic scntterinf spectra of 1,2-dichloroethane crystal have been measured at three temperatures above and below 177Β°K where the crystal undergoes a broad phase transition. Tfvo and three peaks have been observed in the hi& and low temperature phases, respectively. The frcqucncy distribut

Polymer complexes. XIII. Thermal stabili
Polymer complexes. XIII. Thermal stability of poly(2-acrylamidobenzoic acid) homopolymer and polymer complexes of 2-acrylamidobenzoic acid with transition metals
✍ M. A. Diab; A. Z. El-Sonbati; A. A. El-Sanabari; F. I. Taha πŸ“‚ Article πŸ“… 1990 πŸ› John Wiley and Sons 🌐 English βš– 391 KB πŸ‘ 2 views

## Abstract Complexes of poly(2‐acrylamidobenzoic acid) with transition metals were prepared and characterized by elemental analysis, electronic and vibration spectroscopy, and magnetic moment measurements. The thermal stabilities of the formed polymer complexes were compared with that of the poly(