Molecular symmetry - Wikipedia
Symmetry axis: an axis around which a rotation by results in a molecule indistinguishable from the original. This is also called an n -fold rotational axis and abbreviated C n . Examples are the C 2 axis in water and the C 3 axis in ammonia .
12.2: The Symmetry of Molecules - Chemistry LibreTexts
2016年5月31日 · In a rotation, the line of points that stay in the same place constitute a symmetry axis; in a reflection the points that remain unchanged make up a plane of symmetry. The symmetry of a molecule or ion can be described in terms of the complete collection of symmetry operations it possesses.
12.2: Symmetry Elements and Operations Define ... - Chemistry …
In a rotation, the line of points that stay in the same place constitute a symmetry axis; in a reflection the points that remain unchanged make up a plane of symmetry. The symmetry of a molecule or ion can be described in terms of the complete collection of symmetry operations it …
Symmetry in Organic Chemistry - Michigan State University
Symmetry in Organic Chemistry. The symmetry of a molecule is determined by the existence of symmetry operations performed with respect to symmetry elements. A symmetry element is a line, a plane or a point in or through an object, about which a rotation or reflection leaves the object in an orientation indistinguishable from the original.
The axis of rotation or simply the symmetry axis may simply be defined as the line passing through a molecular geometry about which the rotation through a certain angle generates indistinguishable images. The axis of rotation is generally symbolized by Cn where n can have the value from 1, 2, 3, 4… and so on. The expression for n is = 360° 𝜃
All symmetry elements of a molecule pass through a central point within the molecule. The symmetry of a molecule or ion can be described in terms of the complete collection of symmetry operations it possesses. The total number of operations may …
Each element is a LINE, PLANE or POINT about which the symmetry operation is performed. Example above - operation was rotation, element was a ROTATION AXIS. Other examples later. symmetry operations more fundamental, but elements often easier to spot. some symmetry elements give rise to more than one operation - especially rotation - as above.
4.1: Symmetry Operations and Elements - Chemistry LibreTexts
2021年9月24日 · An example of a symmetry operation is a 180° rotation of a water molecule in which the resulting position of the molecule is indistinguishable from the original position (see Figure \(\PageIndex{1}\)). In this example, the symmetry operation is the rotation and the symmetry element is the axis of rotation.
Principal axis of symmetry: The axis with the largest n value Horizontal plane: Plane of reflection to which the principal axis is perpendicular Vertical Plane: Contains the principal axis
Principal axis of symmetry: The axis with the largest n value Horizontal plane: Plane of reflection to which the principal axis is perpendicular Vertical Plane: Contains the principal axis Dihedral plane: Vertical plane which bisects the angle between C 2 axes 2