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.
引用
收藏
页码:2237 / 2241
页数:5
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