کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1249808 | 970739 | 2007 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal and photochemical characteristics of silver 4-(4-nitrophenyl)butyrate revealed by infrared and Raman spectroscopy
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
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چکیده انگلیسی
We have investigated the thermal and photochemical characteristics of silver 4-nitrophenylbutyrate (Ag-4NPB) by means of infrared and Raman spectroscopy, coupled with X-ray diffraction (XRD) and thermogravimetry. XRD analysis indicated that Ag-4NPB consisted of a layered structure. Upon heating the sample, structural changes took place, particularly at two specific temperatures. The binding state of the carboxylate group changed from bridging to unidentate at 363Â K. A second dramatic change occurred at 536Â K, producing 4NPB-capped Ag nanoparticles. The latter transition temperature for Ag-4NPB is about 18Â K higher than that for silver stearate (Ag-STA), but nearly 57Â K lower than that for silver 4-nitrobenzoate (Ag-4NBA). The thermal stability of aromatic silver carboxylate is thus lowered by the incorporation of a short alkane chain between the benzene ring and the carboxylate group. On the other hand, Ag-4NPB was readily subjected to photolysis even by the 632.8-nm radiation. Initially, silver nanoparticles appeared to be generated, followed by the nitro-to-amine group conversion. Although silver particles could also be generated from Ag-4NBA, the nitro-to-amine group conversion did not take place by the 632.8-nm light. The photochemical stability thus seemed to be lowered, parallel to the thermal stability, by the incorporation of a short alkane chain between the benzene ring and the carboxylate group.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 44, Issue 2, 17 July 2007, Pages 308-315
Journal: Vibrational Spectroscopy - Volume 44, Issue 2, 17 July 2007, Pages 308-315
نویسندگان
Kwan Kim, Hyun Sook Lee, Hyun Min Kim,