Difference between revisions of "Octadecaborane(22)"

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(Created page with "'''Octadecaborane(22)''', B<sub>18</sub>H<sub>22</sub>, is a polynuclear borane used in the semiconductor industry. ==References== {{reflist}} Category:Boranes {{CC-BY...")
 
 
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{{chembox
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| Section1 = {{Chembox Identifiers
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|  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
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|  StdInChI = 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
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|  StdInChIKey = LJRWTCAOTPVXCS-UHFFFAOYSA-N
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  }}
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| Section2 = {{Chembox Properties
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|  Reference = <ref name="Struct">{{citation | first1 = Paul G. | last1 = Simpson | first2 = William N. | last2 = Lipscomb | title = Molecular structure of B<sub>18</sub>H<sub>22</sub> | journal = Proc. Natl. Acad. Sci. | volume = 48 | issue = 9 | pages = 1490–91 | year = 1962 | url = http://www.pnas.org/content/48/9/1490.full.pdf}}.</ref>
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|  Formula = B<sub>18</sub>H<sub>22</sub>
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|  MolarMass = 216.4 g mol<sup>−1</sup>
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|  Density = 1.012 g cm<sup>−3</sup>
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  }}
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| Section3 = {{Chembox Structure
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|  Reference = <ref name="Struct"/>
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|  SpaceGroup = P''ccn'' (No. 56)
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|  LattConst_a = 1084.4(3) pm
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|  LattConst_b = 1210.7(3) pm
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|  LattConst_c = 1080.3(4) pm
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  }}
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}}
 
'''Octadecaborane(22)''', B<sub>18</sub>H<sub>22</sub>, is a polynuclear [[borane]] used in the semiconductor industry.
 
'''Octadecaborane(22)''', B<sub>18</sub>H<sub>22</sub>, is a polynuclear [[borane]] used in the semiconductor industry.
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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''-B<sub>18</sub>H<sub>22</sub>.<ref name="Struct"/>
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It was originally prepared from the B<sub>20</sub>H<sub>18</sub><sup>2−</sup> anion,<ref>{{citation | title = The Preparation of a New Boron Hydride B<sub>18</sub>H<sub>22</sub> | first1 = Anthony R. | last1 = Pitochelli | first2 = M. Frederick | last2 = Hawthorne | journal = J. Am. Chem. Soc. | year = 1962 | volume = 84 | issue = 16 | page = 3218 | doi = 10.1021/ja00875a058}}.</ref> but a more convenient method is the oxidation of the B<sub>9</sub>H<sub>12</sub><sup>−</sup> cluster, for example with [[iodine]] in [[toluene]] solution.<ref>{{citation | title = Preparation of ''n''-octadecaborane(22), ''n''-B<sub>18</sub>H<sub>22</sub>, by oxidative fusion of dodecahydrononaborate(1−) clusters | first1 = Donald F. | last1 = Gaines | first2 = Caterina K. | last2 = Nelson | first3 = Gail A. | last3 = Steehler | journal = J. Am. Chem. Soc. | year = 1984 | volume = 106 | issue = 23 | pages = 7266–67 | doi = 10.1021/ja00335a079}}.</ref><ref>{{citation | title = Improved Synthetic Route to ''n''-B<sub>18</sub>H<sub>22</sub> | first1 = Yuqi | last1 = Li | first2 = Larry G. | last2 = Sneddon | journal = Inorg. Chem. | year = 2006 | volume = 45 | issue =2 | pages = 470–71 | doi = 10.1021/ic051712z}}.</ref>
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Octadecaborane(22) can be deprotonated to the B<sub>18</sub>H<sub>21</sub><sup>−</sup> anion: this will react with [[borane—dimethyl sulfide]] to give B<sub>19</sub>H<sub>22</sub><sup>−</sup>, which can be degraded with [[formaldehyde]] to an equimolar mixture of ''syn''- and ''anti''-B<sub>18</sub>H<sub>22</sub>, effectively allowing the interconversion of the two isomers.<ref>{{citation | first1 = Michael G. S. | last1 = Londesborough | first2 = Jonathan | last2 = Bould | first3 = Tomáš | last3 = Baše | first4 = Drahomír | last4 = Hnyk | first5 = Mario | last5 = Bakardjiev | first6 = Josef | last6 = Holub | first7 = Ivana | last7 = Císařová | first8 = John D. | last8 = Kennedy | title = An Experimental Solution to the “Missing Hydrogens” Question Surrounding the Macropolyhedral 19-Vertex Boron Hydride Monoanion &#91;B<sub>19</sub>H<sub>22</sub>&#93;<sup>−</sup>, a Simplification of Its Synthesis, and Its Use As an Intermediate in the First Example of ''syn''-B<sub>18</sub>H<sub>22</sub> to ''anti''-B<sub>18</sub>H<sub>22</sub> Isomer Conversion | journal = Inorg. Chem. | year = 2010 | volume = 49 | issue = 9 | pages = 4092–98 | doi = 10.1021/ic901976y}}.</ref> The cluster will also react with low valent transition metal centres to form [[metalloborane]] species.<ref>{{citation | first1 = Jesse W. | last1 = Taylor | first2 = Ulrich | last2 = Englich | first3 = Karin | last3 = Ruhlandt-Senge | first4 = James T. | last4 = Spencer | title = Preparation and Characterization of Macropolyhedral Metallaborane Clusters from the ''anti''-B<sub>18</sub>H<sub>22</sub> Borane Cluster: Crystal Structure of &#91;(CH<sub>3</sub>)<sub>4</sub>N&#93;&#91;''anti''-B<sub>18</sub>H<sub>20</sub>Co(CO)<sub>3</sub>&#93; | journal = Organometallics | year = 2002 | volume = 21 | issue = 14 | pages = 3054–57 | doi = 10.1021/om020139d}}.</ref>
  
 
==References==
 
==References==
 
{{reflist}}
 
{{reflist}}
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==External links==
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{{wikipedia|Octadecaborane}}
  
 
[[Category:Boranes]]
 
[[Category:Boranes]]
  
 
{{CC-BY-3.0}}
 
{{CC-BY-3.0}}

Latest revision as of 18:54, 23 December 2010

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. 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>.
  2. 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.
  3. 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.
  4. Li, Yuqi; Sneddon, Larry G. Improved Synthetic Route to n-B18H22. Inorg. Chem. 2006, 45 (2), 470–71. DOI: 10.1021/ic051712z.
  5. 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.
  6. 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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