"A Structural and Vibrational Study of the Chromyl Chlorosulfate, Fluorosulfate and Nitrate Compounds" presents important studies related to the structural and vibrational properties on the chromyl compounds based on Ab-initio calculations. The synthesis and the study of such properties are of chemical importance because the stereo-chemistries and reactivities of these compounds are strongly dependent on the coordination modes that adopt the different ligands linked to the chromyl group.
In this book, the geometries of all stable structures in gas phase for chromyl chlorosulfate, fluorosulfate, and nitrate are optimized by using Density functional Theory (DFT). Then, the complete assignments of all observed bands in the infrared and Raman spectra are performed combining DFT calculations with Pulays Scaled Quantum Mechanics Force Field (SQMFF) methodology and taking into account the type of coordination adopted by the chlorosulfate, fluorosulfate and nitrate ligands as monodentate and bidentate. Moreover, the force constants for each compound at the same levels of theory are calculated. As a result, the bond orders calculated and the topological properties of electronic charge density reveal the characteristics and nature of the different bonds in each structure."

"A Structural and Vibrational Investigation into Chromyl Azide, Acetate, Perchlorate and Thiocyanate Compounds" reviews the structural and vibrational properties of chromyl azide, acetate, perchlorate, and thiocyanate from a theoretical point of view by using Density Functional Theory (DFT) methods. These compounds are extensively used in organic syntheses and the study of their structure and spectroscopy has become fundamental.
This book evaluates the best theoretical level and basis set to reproduce the experimental data existing for those compounds. To this end, the optimized geometries and wavenumbers for the normal modes of vibration are calculated and the obtained results are compared and analyzed. Also, the nature of the different types of bonds and their corresponding topological properties of electronic charge density are systematically and quantitatively investigated by using the NBO analysis and the atoms in molecules theory (AIM).

The compounds that contain heterocyclic rings in their structures present diverse properties according to the number and nature of the different substitute to which they are united. Thus, these derivatives are broadly studied from different points of view. This book presents important studies related to the structures, vibrational spectra and descriptors of two series of heterocyclic derivatives; on one hand, some derivatives are of importance for the health and, on the other hand, others are of environmental importance. Chapters 1 to 6 are oriented towards the first series of derivatives broadly used in the pharmacological industry for human health. From Chapters 7 to 9, the studies are oriented toward the properties of the hexaclhorobenzene, 2,4 dichlorophenoxy acetic acid and sulfonylureas derivatives where the sulfonylureas are herbicides of low dosage, low mammalian toxicity, high selectivity, and benign environmental activity while on the contrary, hexaclhorobenzene and 2,4 dichlorophenoxy acetic acid present high toxicities.