Munetaka Iwamura

TL;DR: The temporal spectral evolution relevant to the structural change clearly exhibited an isoemissive point around 675 nm, which manifests that there exists a shallow potential minimum at the perpendicular geometry on the S1 surface, and the S2 state stays undistorted for a finite period as long as 660 fs before the structural distortion.

TL;DR: It was concluded that photoexcitation induces a(1) vibrations containing the Cu-ligand bond length change and a b-1 vibration attributed to the ligand-twisting motion that has the same symmetry as the flattening distortion.

TL;DR: Clear understanding of the ultrafast excited-state process provides a solid basis for designing and using Cu(I) complexes, such as controlling the structural change to efficiently utilize the energy of the MLCT state in solar energy conversion.

TL;DR: The Sonogashira coupling of γ-CD-encapsulated alkynylpyrenes with terphenyl-type stopper molecules gave a doubly alkynypyrene-threaded [4]rotaxane, which showed strong circularly polarized luminescence and may result from the two stacked pyrenes existing in the rotaxane in an asymmetrically twisted manner.

TL;DR: An unprecedented effect of aggregation is demonstrated on the photoluminescence (PL) profiles of [core + exo]-type [Au8]4+ clusters, which displayed a change in the dominant PL emission mode from fluorescence to phosphorescence-type upon aggregation.