Octadecaborane(22)
| Octadecaborane(22) | |
|---|---|
| Identifiers | |
| InChI | InChI=1/B18H22/c19-1-9-3(19)5- 11(3,9)13(9)7(9,21-1)17(13)15( 5,11,13)18(17,23-5)8-10-2(22-8 )20-4(10)6(24-17)12(4,10)14(8, 10,18)16(6,12,17)18/h1-16H |
| Standard InChI | InChI=1S/B18H22/c19-1-9-3(19)5 -11(3,9)13(9)7(9,21-1)17(13)15 (5,11,13)18(17,23-5)8-10-2(22- 8)20-4(10)6(24-17)12(4,10)14(8 ,10,18)16(6,12,17)18/h1-16H |
| Standard InChIKey | LJRWTCAOTPVXCS-UHFFFAOYSA-N |
| Properties[1] | |
| Chemical formula | B18H22 |
| Molar mass | 216.4 g mol−1 |
| Density | 1.012 g cm−3 |
| Structure[1] | |
| Space group | Pccn (No. 56) |
| Lattice constant | a = 1084.4(3) pm, b = 1210.7(3) pm, c = 1080.3(4) pm |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
Octadecaborane(22), B18H22, is a polynuclear borane used in the semiconductor industry.
It is structurally related to decaborane(14): the structure can be viewed as two fused arachno-decaborane units. The usual form of octadecaborane(22) is the anti-fused structure, also referred to as n-B18H22.[1]
It was originally prepared from the B20H182− anion,[2] but a more convenient method is the oxidation of the B9H12− cluster, for example with iodine in toluene solution.[3][4]
Octadecaborane(22) can be deprotonated to the B18H21− anion: this will react with borane—dimethyl sulfide to give B19H22−, which can be degraded with formaldehyde to an equimolar mixture of syn- and anti-B18H22, effectively allowing the interconversion of the two isomers.[5] The cluster will also react with low valent transition metal centres to form metalloborane species.[6]
References
- ↑ 1.0 1.1 1.2 Simpson, Paul G.; Lipscomb, William N. Molecular structure of B18H22. Proc. Natl. Acad. Sci. 1962, 48 (9), 1490–91, <http://www.pnas.org/content/48/9/1490.full.pdf>.
- ↑ Pitochelli, Anthony R.; Hawthorne, M. Frederick The Preparation of a New Boron Hydride B18H22. J. Am. Chem. Soc. 1962, 84 (16), 3218. DOI: 10.1021/ja00875a058.
- ↑ Gaines, Donald F.; Nelson, Caterina K.; Steehler, Gail A. Preparation of n-octadecaborane(22), n-B18H22, by oxidative fusion of dodecahydrononaborate(1−) clusters. J. Am. Chem. Soc. 1984, 106 (23), 7266–67. DOI: 10.1021/ja00335a079.
- ↑ Li, Yuqi; Sneddon, Larry G. Improved Synthetic Route to n-B18H22. Inorg. Chem. 2006, 45 (2), 470–71. DOI: 10.1021/ic051712z.
- ↑ Londesborough, Michael G. S.; Bould, Jonathan; Baše, Tomáš; Hnyk, Drahomír; Bakardjiev, Mario; Holub, Josef; Císařová, Ivana; Kennedy, John D. An Experimental Solution to the “Missing Hydrogens” Question Surrounding the Macropolyhedral 19-Vertex Boron Hydride Monoanion [B19H22]−, a Simplification of Its Synthesis, and Its Use As an Intermediate in the First Example of syn-B18H22 to anti-B18H22 Isomer Conversion. Inorg. Chem. 2010, 49 (9), 4092–98. DOI: 10.1021/ic901976y.
- ↑ Taylor, Jesse W.; Englich, Ulrich; Ruhlandt-Senge, Karin; Spencer, James T. Preparation and Characterization of Macropolyhedral Metallaborane Clusters from the anti-B18H22 Borane Cluster: Crystal Structure of [(CH3)4N][anti-B18H20Co(CO)3]. Organometallics 2002, 21 (14), 3054–57. DOI: 10.1021/om020139d.
External links
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See also the corresponding article on Wikipedia. |
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