Liu Diansheng

Experimental and theoretical study of 10-methoxy-2-phenylbenzo[h]quinoline

10-Methoxy-2-phenylbenzo[h]quinoline (MPBQ) has been synthesized and characterized by NMR and X-ray single crystal diffraction. Both the ground and the lowest singlet excited-state geometries of MPBQ were optimized by B3LYP and ab initio CIS methods at 6-31G (d,p) level, respectively. The absorption and emission spectra of the compound were experimentally determined in CH(3)CN solution and were simultaneously computed using density functional theory (DFT) and time-dependent density functional theory (TDDFT) in CH(3)CN solution. The calculated absorption and emission wavelengths were in good agreement with the experimental ones. The calculated lowest-lying absorption spectra can be mainly attributed to intramolecular charge transfer (ICT). And the calculated fluorescence spectra can be mainly described as originating from an excited state with intramolecular charge transfer (ICT) character. These results show that MPBQ exhibited excellent thermal stability and could serve as a useful photoluminescence material.

Dynamic control and functionalization ofsupramolecular chirality

Chirality is the basic features of living matter, which is very common in nature. Inspired by the typical functions of chiral superstructures performed by biological systems, some supramolecular assemblies with chirality have been designed with the help of non-covalent intermolecular interactions, such as hydrogen bonds, π - π stacking, electrostatic forces, van der Waals forces, hydrophobic interactions, and dipole-dipole interactions. The research related to supramolecular chirality has been received increasing interest due to the dynamic characteristics of the non-covalent forces. Supramolecular chirality has become one of the hottest research topics due to the great importance in developing the life sciences, material chemistry and other related disciplines. Supramolecular self-assembly is the effective strategy for the preparation of the nano-materials with special structures and excellent properties. Supramolecular chirality can be constructed following sergeant-soldier principle or majority rule in the assembled system containing chiral molecules. In addition, supramolecular chirality could also emerge through spontaneous symmetry breaking even when only achiral molecules are involved. Dynamic supramolecular chiral materials exhibit excellent stimuli-responsiveness, the assembled structure and functional properties show sensitive change in response to external stimuli. Due to the dynamic characteristics of the supramolecular self-assembly, the supramolecular chirality can be regulated by light, temperature, redox, pH, solvent, ultrasound, ion, concentration, and so on. Supramolecular chirality attracts so much attention due to their potential applications. The supramolecular chirality has been found to be beneficial in chiral templates, chiral switches, chiral catalysis and chiral liquid crystals. Furthermore, some novel functional applications such as chiral sensing, circularly polarized luminescencent materials, and biomedical materials have been observed. The achievements expand space for the research field of supramolecular chirality, and provide novel thoughts and methods for the study of chiral scientific issues. We believe that more structural supramolecular chiral systems with functional properties are expected to be developed, and the scientific workers would uncover the mystery of the nature of the chirality and the origin of life in the future.