A chiral tetrathiafulvalene (1) bearing a binaphtholdimethylene moiety on one side, an ethylenedithio substituent on the other side, is prepared from atropoisomeric (R)-, (S)- and racemic (R,S)-binaphthol. Its oxidation potential (0.49 V vs.SCE) allows for its oxidation with TCNQF4. Crystal structures of the neutral racemic (R,S)-1 and enantiopure (R)-1 were determined together with those of the enantiopure charge-transfer salts formulated as [(R)-1][TCNQF4]·CH2Cl2 and [(S)-1][TCNQF4]·CH2Cl2, the first enantiomeric salts of chiral TTFs with axial chirality. Despite the peculiar geometry adopted by the binaphthyl moieties in the constrained ten-membered ring in 1, stacking of the donor molecules is observed, both in the neutral state and in the TCNQF4 charge transfer salts where the (1)+˙ and (TCNQF4)−˙ radical species are associated, respectively, into [(1)2]2+ and [(TCNQF4)2]2− homodyads, both in their singlet state.
一种具有二
萘醇二亚甲基结构和
乙烯二
硫代取代基的手性
四硫富瓦烯(1)是由厄尔托异构体的(R)-、(S)-和外消旋(R,S)-二
萘醇制备的。它的氧化电位为0.49 V(相对于SCE),允许其与TCNQF4发生氧化反应。中性外消旋(R,S)-1和手性纯(R)-1的晶体结构,以及手性纯电荷转移盐[(R)-1][TCNQF4]·
CH2Cl2和[(S)-1][TCNQF4]· 的晶体结构被确定,它们是具有轴向手性的手性
四硫富瓦烯的首次手性盐。尽管在1的限制十元环中二
萘基团采用了特殊的几何构型,但在中性状态和TCNQF4电荷转移盐中分别观察到了给体分子的堆叠,其中(1)+˙和(TCNQF4)−˙自由基物种分别关联成[(1)2]2+和[(TCNQF4)2]2−同质配对体,两者均处于单态。