In chemistry, T-shaped molecular geometry describes the structures of some molecules where a central atom has three ligands. Ordinarily, three-coordinated compounds adopt trigonal planar or pyramidal geometries. Examples of T-shaped molecules are the halogen trifluorides, such as ClF3.[1]
Structure of chlorine trifluoride, an example of a compound with T-shaped coordination geometry.
According to VSEPR theory, T-shaped geometry results when three ligands and two lone pairs of electrons are bonded to the central atom, written in AXE notation as AX3E2. The T-shaped geometry is related to the trigonal bipyramidal molecular geometry for AX5 molecules with three equatorial and two axial ligands. In an AX3E2 molecule, the two lone pairs occupy two equatorial positions, and the three ligand atoms occupy the two axial positions as well as one equatorial position. The three atoms bond at 90° angles on one side of the central atom, producing the T shape.[2]
The trifluoroxenate(II) anion, XeF− 3, has been investigated as a possible first example of an AX3E3 molecule, which might be expected by VSEPR reasoning to have six electron pairs in an octahedral arrangement with both the three lone pairs and the three ligands in a mer or T-shaped orientations.[3] Although this anion has been detected in the gas phase, attempts at synthesis in solution and experimental structure determination were unsuccessful. A computational chemistry study showed a distorted planar Y-shaped geometry with the smallest F–Xe–F bond angle equal to 69°, rather than 90° as in a T-shaped geometry.[3]
^Greenwood, N. N.; Earnshaw, A. (1997). Chemistry of the Elements (2nd ed.). Oxford: Butterworth-Heinemann. ISBN978-0-7506-3365-9.
^Housecroft, C. E.; Sharpe, A. G. (2004). Inorganic Chemistry (2nd ed.). Prentice Hall. p. 47. ISBN978-0-13-039913-7.
^ abVasdev, Neil; Moran, Matthew D.; Tuononen, Heikki M.; Chirakal, Raman; Suontamo, Reijo J.; Bain, Alex D.; Schrobilgen, Gary J. (2010). "NMR Spectroscopic Evidence for the Intermediacy of XeF− 3 in XeF2/F− Exchange, Attempted Syntheses and Thermochemistry of XeF− 3 Salts, and Theoretical Studies of the XeF− 3 Anion". Inorg. Chem.49 (19): 8997–9004. doi:10.1021/ic101275m. PMID 20799721. S2CID 25413351.
shaped, molecular, geometry, chemistry, describes, structures, some, molecules, where, central, atom, three, ligands, ordinarily, three, coordinated, compounds, adopt, trigonal, planar, pyramidal, geometries, examples, shaped, molecules, halogen, trifluorides,. In chemistry T shaped molecular geometry describes the structures of some molecules where a central atom has three ligands Ordinarily three coordinated compounds adopt trigonal planar or pyramidal geometries Examples of T shaped molecules are the halogen trifluorides such as ClF3 1 T shaped molecular geometryExamplesClF3Point groupC2vCoordination number3Bond angle s 90 180 m Polarity gt 0Structure of chlorine trifluoride an example of a compound with T shaped coordination geometry According to VSEPR theory T shaped geometry results when three ligands and two lone pairs of electrons are bonded to the central atom written in AXE notation as AX3E2 The T shaped geometry is related to the trigonal bipyramidal molecular geometry for AX5 molecules with three equatorial and two axial ligands In an AX3E2 molecule the two lone pairs occupy two equatorial positions and the three ligand atoms occupy the two axial positions as well as one equatorial position The three atoms bond at 90 angles on one side of the central atom producing the T shape 2 The trifluoroxenate II anion XeF 3 has been investigated as a possible first example of an AX3E3 molecule which might be expected by VSEPR reasoning to have six electron pairs in an octahedral arrangement with both the three lone pairs and the three ligands in a mer or T shaped orientations 3 Although this anion has been detected in the gas phase attempts at synthesis in solution and experimental structure determination were unsuccessful A computational chemistry study showed a distorted planar Y shaped geometry with the smallest F Xe F bond angle equal to 69 rather than 90 as in a T shaped geometry 3 See also editAXE methodReferences edit Greenwood N N Earnshaw A 1997 Chemistry of the Elements 2nd ed Oxford Butterworth Heinemann ISBN 978 0 7506 3365 9 Housecroft C E Sharpe A G 2004 Inorganic Chemistry 2nd ed Prentice Hall p 47 ISBN 978 0 13 039913 7 a b Vasdev Neil Moran Matthew D Tuononen Heikki M Chirakal Raman Suontamo Reijo J Bain Alex D Schrobilgen Gary J 2010 NMR Spectroscopic Evidence for the Intermediacy of XeF 3 in XeF2 F Exchange Attempted Syntheses and Thermochemistry of XeF 3 Salts and Theoretical Studies of the XeF 3 Anion Inorg Chem 49 19 8997 9004 doi 10 1021 ic101275m PMID 20799721 S2CID 25413351 External links editChem Chemistry Structures and 3D Molecules permanent dead link Indiana University Molecular Structure Center Interactive molecular examples for point groups Molecular Modeling Animated Trigonal Planar Visual nbsp This stereochemistry article is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title T shaped molecular geometry amp oldid 1189329769, wikipedia, wiki, book, books, library,
