title: IR spectroscopic analysis of the new organic silver complex C13H13N4OAg.
abstract: IR analysis in the frequency range 400-4000 cm(-1) is used here to investigate the changes in different modes of thermally treated new metal complex (diphenyl carbazide silver complex DPCAg, C13H13N4OAg) during the glass transition at 91 °C and the high temperature phase transition at 167 °C. These two phase transitions in this new metal compound are studied here by detecting the changes in some IR spectroscopic parameters (e.g., mode shift, band contour, peak height and peak intensity) during the elevation of temperature. All of the vibrations of DPCAg were found to be due to ionic fundamentals 3311 cm(-1), 3097 cm(-1), 3052 cm(-1), 1677 cm(-1), 1602 cm(-1), 1492 cm(-1), 1306 cm(-1), 1252 cm(-1), 887 cm(-1) and 755 cm(-1). The results obtained can be considered as the first spectroscopic analysis of this new metal complex. These results strongly confirmed that the thermally treated DPCAg transverse a glass transition at 91 °C and a high temperature phase transition at 167 °C. Anomalous spectroscopic changes near the glass transition temperature Tg could be recorded. A temperature dependence of peak intensity of the two modes 810 cm(-1) and 3440 cm(-1) could be observed beyond Tg. Also, the high temperature phase modification at 167 °C showed anomalous change in the spectroscopic parameters before and after the phase transition process. A proposed silver position in the new silver complex DPCAg has been presented.
authors: Physics Dept., Faculty of Science, Cairo University, Egypt.
authors: F
authors: F
authors: El-Kabbany
authors: S
authors: S
authors: Taha
authors: M
authors: M
authors: Hafez
mesh_terms: D002152:Calorimetry, Differential Scanning; D056831:Coordination Complexes / Q000737:chemistry*; D004160:Diphenylcarbazide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry*; D013055:Spectrophotometry, Infrared; D013696:Temperature; D013818:Thermogravimetry; D014961:X-Ray Diffraction
chemical_list: D056831:Coordination Complexes; D004160:Diphenylcarbazide; D012834:Silver