STRUCTURES AND MOLECULAR-PROPERTIES OF STERICALLY OVERCROWDED MOLECULES .37. HEXAKIS(TRIMETHYLSILYLMETHYL)BENZENE C6[CH2SI(CH3)3]6

被引：8

作者：

BOCK, H

MEURET, J

RUPPERT, K

机构：

[1] Institut Für Anorganische Chemie, Universität Frankfurt, Frankfurt, D-60439, Niederurseler Hang

来源：

CHEMISCHE BERICHTE-RECUEIL | 1993年 / 126卷 / 10期

关键词：

STERICALLY OVERCROWDED ORGANOSILICON MOLECULES; RADICAL CATION DYNAMICS; SILICON COMPOUNDS;

D O I：

10.1002/cber.19931261011

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Both the low first vertical ionization energy of only 740 eV, determined by PE spectroscopy for C6[CH2Si(CH3)3]6, and the blocked substituent rotation in its radical cation as proven by ESR/ENDOR spectroscopy suggest considerable steric over-crowdedness. To further substantiate this interpretation of the molecular properties, the crystal structure (hexagonal R3BAR, Z = 2) has been determined at 100 K. Accordingly the bulky trimethylsilyl groups are arranged alternatingly above or below the C6-ring plane out of which the methylene C centers care twisted by +/-9-degrees. Due to the angles CCSi widened to 115-degrees, however, the intramolecular distances C(H)...(H)C between non-neighboured methyl groups of 443 and 452 pm even slightly exceed their van der Waals radii sum of 400 pm and thus avoid severe spatial congestion.

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页码：2237 / 2241

页数：5

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