Metal Hydrazine Cinnamates. Synthesis and Characterization

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Chapter 2.3. Physico-chemical techniques:
The instrumental techniques used in the present study are, Infrared spectroscopy (IR), Thermo Gravimetry-Differential Thermal Analysis/Differential Scanning Calorimetry (TG-DTA/TG-DSC), Scanning Electron Microscopy (SEM) and Energy Dispersive X-Ray Analysis (EDX).
2.3.1 Infrared spectral analysis:
The infrared spectrum of a molecule is considered to be its unique and characteristic physical property. The basic interpretation of an IR spectrum leads to the characterization and identification of the sample. The IR spectrum is formed as a consequence of the absorption of electromagnetic radiation at frequencies that correlate to the vibration of specific sets of chemical bonds from within a molecule. Bonds with different bond lengths, strength, bending and torsional characteristics absorb different wavelengths of IR radiation, and the absorption maxima maybe characteristics of the types of linkages present; the absorption generally occurs in the 4000-400 cm-1 region of the spectrum.
Infrared radiation is capable of affecting both rotational and vibrational energy levels in the molecules [212, 213]. Some molecular vibrations are characteristic of the entire molecule, whereas others are associated with certain functional groups. IR spectra of solids are usually complex with a considerable number of peaks, each corresponding to a particular vibrational transition. Since a complete assignment of all the peaks to the specific vibrational modes is possible, straight forward identification of specific functional groups, covalently bonded linkage such as hydroxyl groups, trapped water, oxyanions, carbonates, nitrates, sulphates etc., and the modes of binding of the ligand to the metal ion can be made. As such, infrared spectroscopy has become an important technique in the elucidation of the structure of organic compounds and metal complexes. Plots of IR spectra show the frequency or wave number of incident radiation

Dr.K. Kalpanadevi, MSc., MPhil., Ph.D., is serving as Assistant professor in the Department of Chemistry, Kongunadu Arts and Science College, Coimbatore, Tamilnadu, India. To date, he has a teaching experience of nine years and a research experience of six years. His areas of specialization include coordination chemistry and nanomaterial chemistry. He has published 23 papers in international journals so far, many of them having a number of citations.