Trigonal planar molecular geometry
- Trigonal planar molecular geometry
In chemistry, trigonal planar is a molecular geometry with one atom at the center and three atoms at the corners of a triangle all in one planeFact|date=January 2008. In an ideal trigonal planar species, all three ligands are identical and all bond angles are 120°. Such species belong to the point group D3h. Molecules where the three ligands are not identical, such as H2CO, deviate from this idealized geometry. Examples of molecules with trigonal planar geometry include boron trifluoride (BF3), formaldehyde (H2CO), phosgene [COCl2), and sulfur trioxide (SO3). Some ions with trigonal planar geometry include nitrate (NO3−), carbonate ion (CO32−), and guanidinium C(NH2)3+. In organic chemistry, planar, three-connected carbon centers that are trigonal planar are often described as having sp2 hybridization. [Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. ISBN 0-12-352651-5.] [G. L. Miessler and D. A. Tarr “Inorganic Chemistry” 3rd Ed, Pearson/Prentice Hall publisher, ISBN 0-13-035471-6.]
Nitrogen inversion is the distortion of pyramidal amine through a transition state that is trigonal planar.
References
ee also
*AXE method
*Molecular geometry
External links
* [http://www.3dchem.com/ 3D Chem Chemistry, Structures, and 3D Molecules]
* [http://www.iumsc.indiana.edu/ Indiana University Molecular Structure Center]
* [http://www.phys.ncl.ac.uk/staff/njpg/symmetry/Molecules_l3d.html Point Group Symmetry Interactive Examples]
* [http://chemlab.truman.edu/CHEM121Labs/MolecularModeling1.htm Molecular Modeling]
* [http://intro.chem.okstate.edu/1314F97/Chapter9/3BP.html Animated Trigonal Planar Visual]
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