大阪大学 · Chemistry
Tadashi Mori 교수의 연구실은 주로 유기 분자의 비대칭 광학 성질, 특히 원형 편광 발광(CPL)과 원형 이형성(CD)을 중심으로 한 분자 설계 및 기초 물리화학적 메커니즘을 연구합니다. 특히 다중 헬리센, 바이아릴, BODIPY 유도체 등의 헬리컬 또는 다중 헬리컬 초구조를 가진 유기 분자를 대상으로, 그들의 광학적 응답을 이론적 계산과 실험을 융합하여 정량적으로 분석합니다. 연구는 분자 내 다중 찌그러짐의 배열 방식이 광학적 비대칭성에 미치는 영향을 규명함으로써, 향후 고성능 유기 광학 소재의 합리적 설계 기반을 마련하는 데 초점을 맞추고 있습니다.
표시된 성과는 수집된 데이터 기준으로 산출되며, 일부 차이가 있을 수 있습니다.
Abstract Prompted by the recent rapid growth of interest in circularly polarized luminescence (CPL) of organic molecules, we have collected all the reliable CPL, as well as the corresponding circular dichroism (CD), data measured in fluid solutions. To analyze the correlation between CPL and CD, we employed the absorption and luminescence dissymmetry factors (g abs and g lum ) of the π–π* transition reported for chiral organic molecules of various categories, including planar chiral cyclophanes
Helicenes have attracted considerable attention due to their inherent helical chirality and extended π-conjugation. Recently, rapid progress has been witnessed in the preparation of double, triple, quadruple, quintuple, and sextuple helicenes, where plural helicene moieties are symmetrically arranged in a single molecule. While synthetic efforts and X-ray crystallographic analyses devoted to these multiple helicenes and theoretical investigations on their isomerization and racemization behaviors
Abstract Chiral molecules play indispensable roles in advanced materials and technologies. Nevertheless, no conventional, yet reliable logical strategies are available for designing chiral molecules of desired chiroptical properties. Here, we propose a general protocol for rationally aligning multiple chiral units to boost the chiroptical responses, using hexahelicene as a prototype. In this proof-of-concept study, we align two hexahelicenes in various orientations and examine by theoretical cal
Cumulus cells of the oocyte play important roles in in vitro maturation and subsequent development. One of the routes by which the factors are transmitted from cumulus cells to the oocyte is gap junctional communication (GJC). The function of cumulus cells in in vitro maturation of porcine oocytes was investigated by using a gap junction inhibitor, heptanol. Cumulus-oocyte complexes (COCs) were collected from the ovaries of slaughtered gilts by aspiration. After selection of COCs with intact cum
In chiral donor-acceptor (D-A) systems, irradiation wavelength plays vital roles in determining the photochemical consequences. Selective excitation of a D-A complex at the charge-transfer (C-T) band affords an excited C-T complex (ECT), while the local-band excitation of D or A may lead to the formation of a conventional exciplex (EX) upon subsequent interaction with the D-A partner. These two excited species, generated from the same D-A pair, may be categorized formally as excited complexes or
Twelve conformations of a chiral donor-acceptor (charge-transfer) dyad and six conformations of its dimer complex were structurally optimized by using the Kohn-Sham density functional theory (BLYP/TZV2P) incorporating a recently developed empirical correction scheme that uses C6/R6 potentials for van der Waals interactions (DFT-D). Subsequent time-dependent DFT calculations with BH-LYP and B3-LYP functionals (with triple-zeta basis set) were performed to obtain theoretical circular dichroism (CD
Pentahelicene (PH) exhibits the largest absorption ( g<sub>abs</sub>) and luminescence ( g<sub>lum</sub>) dissymmetry factors among the helicene family but is configurationally and (photo)chemically labile, encumbering its application to chiroptical materials. To bypass the pitfalls, three PH units are merged in a single molecule to build D<sub>3</sub>-symmetric triple pentahelicene, hexabenzotriphenylene (HBT), which attains indeed the configurational and (photo)chemical robustness through equi
New chiral biphenol ethers (Biph22, Biph33, and Biph44), carrying (R)-methylpropyloxy groups at 2,2'-, 3,3'-, and 4,4'-positions of biphenyl, were prepared. The introduced peripheral chiral groups in these biphenol ethers induce an (averaged) axial chirality to give predominant aR- or aS-rotamers. The chiroptical properties of these axially chiral biphenol ethers in polar and nonpolar solvents were determined experimentally and were compared with the corresponding theoretical values to determine
An aryl alkanoate, 2,4,6-trimethylphenyl (S)-(+)-2-methylbutyrate, whose ester group has a chiral center alpha to the carbonyl carbon and in which photo-Fries rearrangements are blocked by methyl substituents, undergoes facile photodecarboxylation under a variety of conditions and with complete retention of configuration. In fact, the decarboxylation process has many of the attributes of a symmetry-allowed suprafacial [1,3]sigmatropic rearrangement. The process requires concerted extrusion of ca
A novel non-acid methodology for the preparative nitration of aromatic compounds with the lower oxides of nitrogen using a combination of ozonized oxygen or air and some third substance as the promoter is described. The reaction, referred to as the kyodai-nitration, is now subject to industrially based research as the promising pollution-free and energy-saving substitute for the century-old, yet currently ongoing commercial process based on the use of nitric acid-sulfuric acid.
