Crystal structures of three sterically congested disilanes
In the three sterically congested silanes, C24H38Si2 (1) (1,1,2,2-tetraisopropyl-1,2-diphenyldisilane), C24H34Br4Si2 (2) [1,1,2,2-tetrakis(2-bromopropan-2-yl)-1,2-diphenyldisilane] and C32H38Si2 (3) (1,2-di-tert-butyl-1,1,2,2-tetraphenyldisilane), the Si—Si bond length is shortest in (1) and longest...
Main Authors: | , , |
---|---|
Format: | Article |
Language: | English |
Published: |
International Union of Crystallography
2017-03-01
|
Series: | Acta Crystallographica Section E: Crystallographic Communications |
Subjects: | |
Online Access: | http://scripts.iucr.org/cgi-bin/paper?S2056989017002602 |
id |
doaj-5ae4f1016498413cac6c72ecaab5cc0e |
---|---|
record_format |
Article |
spelling |
doaj-5ae4f1016498413cac6c72ecaab5cc0e2020-11-24T20:43:48ZengInternational Union of CrystallographyActa Crystallographica Section E: Crystallographic Communications2056-98902017-03-0173344845210.1107/S2056989017002602su5352Crystal structures of three sterically congested disilanesKothanda Rama Pichaandi0Joel T. Mague1Mark J. Fink2Department of Chemistry, Tulane University, New Orleans, LA 70118, USADepartment of Chemistry, Tulane University, New Orleans, LA 70118, USADepartment of Chemistry, Tulane University, New Orleans, LA 70118, USAIn the three sterically congested silanes, C24H38Si2 (1) (1,1,2,2-tetraisopropyl-1,2-diphenyldisilane), C24H34Br4Si2 (2) [1,1,2,2-tetrakis(2-bromopropan-2-yl)-1,2-diphenyldisilane] and C32H38Si2 (3) (1,2-di-tert-butyl-1,1,2,2-tetraphenyldisilane), the Si—Si bond length is shortest in (1) and longest in (2), with (3) having an intermediate value, which parallels the increasing steric congestion. A comparison of the two isopropyl derivatives, (1 and 2), shows a significant increase in the Si—C(ipso) distance with the introduction of bromine. Also, in the brominated compound 2, attractive intermolecular Br...Br interactions exist with Br...Br separations ca 0.52 Å shorter than the sum of the van der Waals radii. In compound 2, one of the bromoisopropyl groups is rotationally disordered in an 0.8812 (9):0.1188 (9) ratio. Compound 3 exhibits `whole molecule' disorder in a 0.9645 (7):0.0355 (7) ratio with the Si—Si bonds in the two components making an angle of ca 66°.http://scripts.iucr.org/cgi-bin/paper?S2056989017002602crystal structuredisilanehalogen–halogen interaction |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Kothanda Rama Pichaandi Joel T. Mague Mark J. Fink |
spellingShingle |
Kothanda Rama Pichaandi Joel T. Mague Mark J. Fink Crystal structures of three sterically congested disilanes Acta Crystallographica Section E: Crystallographic Communications crystal structure disilane halogen–halogen interaction |
author_facet |
Kothanda Rama Pichaandi Joel T. Mague Mark J. Fink |
author_sort |
Kothanda Rama Pichaandi |
title |
Crystal structures of three sterically congested disilanes |
title_short |
Crystal structures of three sterically congested disilanes |
title_full |
Crystal structures of three sterically congested disilanes |
title_fullStr |
Crystal structures of three sterically congested disilanes |
title_full_unstemmed |
Crystal structures of three sterically congested disilanes |
title_sort |
crystal structures of three sterically congested disilanes |
publisher |
International Union of Crystallography |
series |
Acta Crystallographica Section E: Crystallographic Communications |
issn |
2056-9890 |
publishDate |
2017-03-01 |
description |
In the three sterically congested silanes, C24H38Si2 (1) (1,1,2,2-tetraisopropyl-1,2-diphenyldisilane), C24H34Br4Si2 (2) [1,1,2,2-tetrakis(2-bromopropan-2-yl)-1,2-diphenyldisilane] and C32H38Si2 (3) (1,2-di-tert-butyl-1,1,2,2-tetraphenyldisilane), the Si—Si bond length is shortest in (1) and longest in (2), with (3) having an intermediate value, which parallels the increasing steric congestion. A comparison of the two isopropyl derivatives, (1 and 2), shows a significant increase in the Si—C(ipso) distance with the introduction of bromine. Also, in the brominated compound 2, attractive intermolecular Br...Br interactions exist with Br...Br separations ca 0.52 Å shorter than the sum of the van der Waals radii. In compound 2, one of the bromoisopropyl groups is rotationally disordered in an 0.8812 (9):0.1188 (9) ratio. Compound 3 exhibits `whole molecule' disorder in a 0.9645 (7):0.0355 (7) ratio with the Si—Si bonds in the two components making an angle of ca 66°. |
topic |
crystal structure disilane halogen–halogen interaction |
url |
http://scripts.iucr.org/cgi-bin/paper?S2056989017002602 |
work_keys_str_mv |
AT kothandaramapichaandi crystalstructuresofthreestericallycongesteddisilanes AT joeltmague crystalstructuresofthreestericallycongesteddisilanes AT markjfink crystalstructuresofthreestericallycongesteddisilanes |
_version_ |
1716818836444938240 |