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These groups are characterized by an n-fold improper rotation axis S n, where n is necessarily even. The S 2 group is the same as the C i group in the nonaxial groups section. S n groups with an odd value of n are identical to C nh groups of same n and are therefore not considered here (in particular, S 1 is identical to C s).
Disphenoidal or seesaw (also known as sawhorse [1]) is a type of molecular geometry where there are four bonds to a central atom with overall C 2v molecular symmetry.The name "seesaw" comes from the observation that it looks like a playground seesaw.
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Print/export Download as PDF; Printable version; In other projects ... Melting point: −28 °C; −19 °F; 245 K Boiling point: 180 °C; 356 °F; 453 K
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Point groups are used to describe the symmetries of geometric figures and physical objects such as molecules. Each point group can be represented as sets of orthogonal matrices M that transform point x into point y according to y = Mx. Each element of a point group is either a rotation (determinant of M = 1), or it is a reflection or improper ...
Melting point Boiling point P–X ax bond length P–X eq bond length X eq –P–X eq bond angle X ax –P–X eq bond angle PF 5 Phosphorus pentafluoride [7647-19-0] -93.7°C -84.5°C 153 pm 158 pm 120° 90° PCl 5 Phosphorus pentachloride [10026-13-8] 160°C 167°C 214 pm 202 pm 120° 90° PBr 5 Phosphorus pentabromide [7789-69-7] ~106°C d
In crystallography, a crystallographic point group is a three dimensional point group whose symmetry operations are compatible with a three dimensional crystallographic lattice. According to the crystallographic restriction it may only contain one-, two-, three-, four- and sixfold rotations or rotoinversions. This reduces the number of ...
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