Effect of pressure on the formation of the intramolecular excited complex state in 4-(9-anthrylmethyl)-N,N-dimethylaniline

Aggregation-Induced Emission-Based Polymer Materials: Ratiometric Fluorescence Responses Controlled by Hydrostatic Pressure

“…, temperature, solvent, or pH) is of particular significance in current multidisciplinary chemistry from the viewpoint of applied materials. − The reason is that such functional applied materials seem to be hold great promise for application in interfacial imaging, probing, and sensing. − For instance, as representative examples presenting dual fluorescence character, it is well known that the excimer/exciplex, , twisted intramolecular charge-transfer, , excited-state intramolecular proton transfer, , and thermally activated delayed fluorescence , are involved in many cases. The luminescence properties observed through these excited-state processes are generally susceptible to microenvironmental polarity and viscosity in solutions based on more polarized excitons formed upon electronic excitation and also to hydrostatic pressure once in a while. − …”

“…Hydrostatic pressure is one of the attractive external stimuli, and thus its effects have been investigated for quite a while. − Recently, studies on hydrostatic pressure or an inherent kind of mechanical force have further been accelerated from the fashionable mechanochromic − and mechanobiological perspectives; − the effects on solutions under hydrostatic pressure are focused herein, rather than the high-pressure solid-state chemistry through diamond anvil cells. − Indeed, we have so far revealed that luminescence behaviors of the mechanochromic compounds, , solvatochromism of the colorimetric dye, and chiroptical properties of the chiral materials are controllable by hydrostatic pressure. Hence, these statements inspired us to develop a novel applied material that displays remarkable ratiometric fluorescence responses toward hydrostatic pressure.…”

High-Pressure Studies on the Excited-State Intramolecular Charge Transfer of 4-(N,N-Dimethylamino)triphenylphosphine in Alcohols

“…By using a high-pressure method, we have been studying the influence of solvent viscosity on various barrier crossing processes involving large amplitude twisting conformational changes due to bulky aromatic groups such as TICT-state formation, , intramolecular excimer formation, and photoisomerization. , In particular, the observation of a weak dependence of the barrier crossing rate on solvent viscosity has been discussed. The use of high pressure is a favorable method for studying the solvent dynamics, because it enables us to change the solvent viscosity for a single solvent greatly and continuously without serious modification of the solvent-shell structure. , According to the solvent change method ordinarily used for changing solvent viscosity, the small viscosity dependence on the charge-transfer (CT) reaction is likely to be hidden by the comparatively large shift of the activation barrier among different solvents.…”

“…[2][3][4][5] Contrary to the early expectation, 3 it has recently been reported that no simple correlation between the TICT-state formation rate and solvent viscosity has been observed for the case of DMABN in a series of polar solvents with different viscosity. 6,7 By using a high-pressure method, we have been studying the influence of solvent viscosity on various barrier crossing processes involving large amplitude twisting conformational changes due to bulky aromatic groups such as TICT-state formation, 8,9 intramolecular excimer formation, 10 and photoisomerization. 11,12 In particular, the observation of a weak dependence of the barrier crossing rate on solvent viscosity has been discussed.…”

Indicating pressure and environmental effects by means of the spectral shift with rhodamine B and fluorescein

“…Already early the influence of pressure in combination with solvent properties, such as polarity and viscosity, on the spectral response of dye molecules has been intensely investigated to conclude upon the nature of electronic transitions and involved conformational changes with particular molecules. 1 Other research dealt with the solvatochromic effect of pressure with respect to the general correlation between spectral peak shift and solvent bulk properties, such as polarizability and density, in an effort to validate theoretical models. 2,3 This is an aspect, where there is still need for clarification.…”