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Stereodynamics and Characterization of the Hexa(4-n-dodecylbiphenylyl)-benzene Hexaanion that Includes a Twisted Benzene Core

机译:包括扭曲的苯核心的六(4-正十二烷基联苯基)-苯六阴离子的立体动力学和表征

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Hexa (4-n-dodecylbiphenylyl)benzene (HDBB) was reduced by a series of alkali metals in THF under high vacuum. Three reduction states were identified by NMR spectroscopy, namely the dianion, tetraanion and hexaanion. The NMR spectra of HDBB~(6-) revealed a remarkable distortion of symmetry, which is interpreted by adoption of a twisted conformation of the central benzene ring and a slow rotation of the inner phenylene rings of the biphenyl units. Due to the surprising thermal stability of the hexaanion, a dynamic NMR investigation revealed the pseudorotatio of the twisted conformation and the phenylene rotation mentioned above.
机译:在高真空下,六(4-正十二烷基联苯基)苯(HDBB)在THF中被一系列碱金属还原。通过NMR光谱鉴定出三个还原态,即二价阴离子,四价阴离子和六价阴离子。 HDBB〜(6-)的NMR光谱显示出显着的对称性扭曲,这可以通过采用中心苯环的扭曲构型和联苯单元的内部亚苯基环的缓慢旋转来解释。由于六阴离子的惊人的热稳定性,动态NMR研究表明上述扭曲构象的假旋转和亚苯基旋转。

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