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## Molecular Symmetry

Molecular symmetry is the description and classification of the symmetry of a molecule, using mathematical and general symmetry considerations. Symmetry and group theory provide us with effective tools for describing the geometry of objects by describing the patterns of their structure. In chemistry allows us the concept of symmetry, to describe the chemical bond types exactly that occur between atoms or groups of atoms in molecules. Likewise, it describes the transitions between energy levels in molecular systems, which contributes to the understanding of the absorption properties of the molecules and thus their spectra , and thus it is also subject of the spectroscopy. Here listed details handle the symmetry in chemistry, the point groups and the mathematical foundations of group theory and aspects of theoretical chemistry. In the following list you will find online available information resources on molecular symmetry and group theory in chemistry.

## Molecular symmetry

The mathematical fundamentals of molecular symmetry and group theory are comprehensibly described in this book. Applications are given in context of electronic and vibrational spectroscopy as well as chemical reactions following orbital symmetry rules. Exercises and examples compile and deepen the content in a lucid manner. EN English Deutsch. Your documents are now available to view.

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Symmetry can help resolve many chemistry problems and usually the first step is to determine the symmetry. If we know how to determine the symmetry of small molecules, we can determine symmetry of other targets which we are interested in. Therefore, this module will introduce basic concepts of group theory and after reading this module, you will know how to determine the symmetries of small molecules. Symmetry is very important in chemistry researches and group theory is the tool that is used to determine symmetry. Usually, it is not only the symmetry of molecule but also the symmetries of some local atoms, molecular orbitals, rotations and vibrations of bonds, etc. For example, if the symmetries of molecular orbital wave functions are known, we can find out information about the binding.

## Introduction to Symmetry and Group Theory for Chemists

Molecular symmetry in chemistry describes the symmetry present in molecules and the classification of molecules according to their symmetry. Molecular symmetry is a fundamental concept in chemistry, as it can be used to predict or explain many of a molecule's chemical properties , such as its dipole moment and its allowed spectroscopic transitions. To do this it is necessary to classify the states of the molecule using the irreducible representations from the character table of the symmetry group of the molecule.

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Any object (or molecule) may be classified into a point group uniquely determined by its symmetry. Groups with low symmetry: {E}=C. 1., Schönflies Symbol/.

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This is also called an n-fold rotational axis and abbreviated Cn. Examples are the C2 in water and the C3 in ammonia. A molecule can have more than one.

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