Helical mesobenzanthrones: a class of highly luminescent helicenes

Chiral Polyaryl Cyclophanes

“…The ellipticities for 5 are comparable in magnitude to those observed for the resolved enantiomers of the closely related cyclophane 2 . The CD effect for 6 is considerably larger, but still small when compared to the values often observed for the carbohelicenes and related compounds (Δ ε ≈ 100–700 m –1 cm –1 ) , , …”

“…We have used this method to screen, computationally, for (possibly) easily prepared molecules with large [ α ] D values. In some cases, the predictions have proven extremely accurate,, in another, wildly inaccurate, and in still others the target compounds have been synthesized but have not yet been resolved into pure enantiomers …”

Synthesis, Molecular Packing, and Thin Film Transistors of Dibenzo[a,m]rubicenes

“…6 The angularly fused pentacyclic moiety in 1a as shown with bold lines in Figure 1a is similar to [5]helicene (Figure 1b) but involves less steric hindrance because it has a cyclopentadiene ring replacing a benzene ring in [5]helicene. 7 Here we report an efficient synthesis of 1a and its new derivatives and demonstrate that the conformation and molecular packing of dibenzo[a,m]rubicenes in the solid state can be tuned by the substituting groups. It is found that silylethynylated derivatives 1b and 1c function as p-type organic semiconductors in solution-processed OTFTs with field effect mobility of up to 1.0 cm 2 V −1 s −1 .…”

Device-Compatible Chiroptical Surfaces through Self-Assembly of Enantiopure Allenes

“…1,10 In this regard, there are several studies focused on the design and synthesis of systems presenting enhanced chiroptical responses in the search for applications in solution. [11][12][13][14][15] On the other hand, constructions of chiroptical surfaces is required in order to develop lab-on-a-chip devices. However, the limited knowledge regarding the interfacial integration of chiroptical compounds has hampered to date the emergence of chiroptical sensors for everyday use.…”

“…Although a racemic mixture or rac, a 1:1 mixture of two enantiomeric counterparts, is not distinguishable spectroscopically from and achiral system, the opposite response of enantiopure chiral systems when interacting with lights of contrary chirality gives rise to chiroptical spectroscopies. , These spectroscopies present remarkably high sensitivity to conformational changes and supramolecular interactions. As a consequence, they are routinely used not only for absolute configuration determination − and conformational assignments , but also for the characterization of molecular assemblies where at least one of the components is chiral. , Moreover, a guest molecule may be identified by the characteristic chiroptical responses when forming a complex with a chiral host, a task far from trivial for nonchiral techniques. , In this regard, there are several studies focused on the design and synthesis of systems presenting enhanced chiroptical responses in the search for applications in solution. − On the other hand, the construction of chiroptical surfaces is required to develop lab-on-chip devices. However, the limited knowledge regarding the interfacial integration of chiroptical compounds has hampered to date the emergence of chiroptical sensors for everyday use.…”