An approach to dendritic oligosilanes: Controlling the conformation through ring formation

C. Krempner; H. Reinke

doi:10.1021/om060964k

An approach to dendritic oligosilanes: Controlling the conformation through ring formation

C. Krempner, H. Reinke

Chemistry and Biochemistry

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12 Scopus citations

Abstract

The synthesis, solid-state structure, and UV spectroscopic properties of the first-generation single-core oligosilane dendrimer MeSi[SiMe ₂Si(SiMe₃)₂Me]₂[SiMe ₂Si(SiMe₃)₃] (5) and the tethered analogue (CH₂)₄[Si(SiMe₃)₂SiMe ₂]₂Si[SiMe₂Si(SiMe₃)₃]Me (4) are reported. UV spectroscopic measurements in solution and in the solid state (diffuse reflectance) show the absorption maximum of tetramethylenetethered 4 to be shifted to wavelengths longer than those of 5, the dendrimers MeSi[SiMe₂Si(SiMe₃)₃] ₃ (6) and MeSi[SiMe₂Si(SiMe₃) ₂Me]₃ (7), and even that of the linear heptasilane Si ₇Me₁₆. This can be explained by the results of the X-ray analysis of 4 and 5, which reveal for 4 the presence of an A-D-A-D conformer, which is optimal for σ-conjugation, whereas in 5 only D-D-O-D conformers have been found.

Original language	English
Pages (from-to)	2053-2057
Number of pages	5
Journal	Organometallics
Volume	26
Issue number	8
DOIs	https://doi.org/10.1021/om060964k
State	Published - Apr 9 2007

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Krempner, C., & Reinke, H. (2007). An approach to dendritic oligosilanes: Controlling the conformation through ring formation. Organometallics, 26(8), 2053-2057. https://doi.org/10.1021/om060964k

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title = "An approach to dendritic oligosilanes: Controlling the conformation through ring formation",

abstract = "The synthesis, solid-state structure, and UV spectroscopic properties of the first-generation single-core oligosilane dendrimer MeSi[SiMe 2Si(SiMe3)2Me]2[SiMe 2Si(SiMe3)3] (5) and the tethered analogue (CH2)4[Si(SiMe3)2SiMe 2]2Si[SiMe2Si(SiMe3)3]Me (4) are reported. UV spectroscopic measurements in solution and in the solid state (diffuse reflectance) show the absorption maximum of tetramethylenetethered 4 to be shifted to wavelengths longer than those of 5, the dendrimers MeSi[SiMe2Si(SiMe3)3] 3 (6) and MeSi[SiMe2Si(SiMe3) 2Me]3 (7), and even that of the linear heptasilane Si 7Me16. This can be explained by the results of the X-ray analysis of 4 and 5, which reveal for 4 the presence of an A-D-A-D conformer, which is optimal for σ-conjugation, whereas in 5 only D-D-O-D conformers have been found.",

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N2 - The synthesis, solid-state structure, and UV spectroscopic properties of the first-generation single-core oligosilane dendrimer MeSi[SiMe 2Si(SiMe3)2Me]2[SiMe 2Si(SiMe3)3] (5) and the tethered analogue (CH2)4[Si(SiMe3)2SiMe 2]2Si[SiMe2Si(SiMe3)3]Me (4) are reported. UV spectroscopic measurements in solution and in the solid state (diffuse reflectance) show the absorption maximum of tetramethylenetethered 4 to be shifted to wavelengths longer than those of 5, the dendrimers MeSi[SiMe2Si(SiMe3)3] 3 (6) and MeSi[SiMe2Si(SiMe3) 2Me]3 (7), and even that of the linear heptasilane Si 7Me16. This can be explained by the results of the X-ray analysis of 4 and 5, which reveal for 4 the presence of an A-D-A-D conformer, which is optimal for σ-conjugation, whereas in 5 only D-D-O-D conformers have been found.

AB - The synthesis, solid-state structure, and UV spectroscopic properties of the first-generation single-core oligosilane dendrimer MeSi[SiMe 2Si(SiMe3)2Me]2[SiMe 2Si(SiMe3)3] (5) and the tethered analogue (CH2)4[Si(SiMe3)2SiMe 2]2Si[SiMe2Si(SiMe3)3]Me (4) are reported. UV spectroscopic measurements in solution and in the solid state (diffuse reflectance) show the absorption maximum of tetramethylenetethered 4 to be shifted to wavelengths longer than those of 5, the dendrimers MeSi[SiMe2Si(SiMe3)3] 3 (6) and MeSi[SiMe2Si(SiMe3) 2Me]3 (7), and even that of the linear heptasilane Si 7Me16. This can be explained by the results of the X-ray analysis of 4 and 5, which reveal for 4 the presence of an A-D-A-D conformer, which is optimal for σ-conjugation, whereas in 5 only D-D-O-D conformers have been found.

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