Journal ArticleDOI
Deuterium isotope effect on femtosecond solvation dynamics in methyl β-cyclodextrins
Reads0
Chats0
TLDR
There is a marked increase in the steady state emission quantum yield and fluorescence lifetime of C153 bound to DMB and TMB in D(2)O, which suggests strong coupling between C153 and D( 2)O inside the cyclodextrin cavity.Abstract:
Deuterium isotope effect on the solvation dynamics and fluorescence anisotropy decay of coumarin 153 (C153) bound to dimethyl β-cyclodextrin (DMB) and trimethyl β-cyclodextrin (TMB) is studied using femtosecond upconversion. In D2O, there is a marked increase in the steady state emission quantum yield and fluorescence lifetime of C153 bound to DMB and TMB. This suggests strong coupling between C153 and D2O inside the cyclodextrin cavity. In D2O, average solvation time of C153 in DMB is about 1.7 times slower compared to that in water. For TMB in D2O, solvation is 1.5 times slower. The deuterium isotope effect on solvation dynamics at long time arises mainly from the longer excited state lifetime. The longest components of solvation dynamics are ascribed to self-diffusion of C153 out of the cyclodextrin cavity. The nearly 1.5 times slower anisotropy decay of C153 bound to DMB and TMB in D2O (compared to H2O) is attributed to higher viscosity of D2O.read more
Citations
More filters
Journal ArticleDOI
Photophysical properties of 7-(diethylamino)coumarin-3-carboxylic acid in the nanocage of cyclodextrins and in different solvents and solvent mixtures.
Aninda Chatterjee,Debabrata Seth +1 more
TL;DR: It was found that the photophysics of 7‐DCCA depended on the structural feature of the solvents and solvent mixtures, and it was proposed that the dye molecule formed capping complex with β‐CD by means of hydrogen bonding and after addition of urea the hydrogen bonding network broke down and part of dye molecule entered inside the cavity of β‐ CD.
Journal ArticleDOI
Hydration properties of α-, β-, and γ-cyclodextrins from molecular dynamics simulations.
TL;DR: It is demonstrated that the geometrical constraints within the cavities of the CD molecules enhance the rate of reformation of broken hydrogen bonds, thereby resulting in rapid establishment of the breaking and reformation equilibria for hydrogen bonds involving cavity water molecules.
Journal ArticleDOI
Deuterium isotope effect on femtosecond solvation dynamics in an ionic liquid microemulsion: an excitation wavelength dependence study.
TL;DR: The deuterium isotope effect on the solvation dynamics and the anisotropy decay of coumarin 480 in a room temperature ionic liquid (RTIL) microemulsion is studied by femtosecond up-conversion.
Journal ArticleDOI
Molecular dynamics study of β-cyclodextrin-phenylalanine (1:1) inclusion complex in aqueous medium.
TL;DR: MD simulations of host-guest inclusion complexes of β-cyclodextrin (BCD) and zwitterionic phenylalanine following two possible orientations of zPHE in aqueous solutions have been carried out and it is found that irrespective of the orientation, the complexation of BCD and z PHE (1:1) is associated with loss of configurational entropy.
Journal ArticleDOI
Deuterium Perturbs the Molecular Arrangement in the Solid State
Klaus Merz,Anna Kupka +1 more
TL;DR: In this paper, it was shown that the aggregati cation of H/D exchange is not a negligible criterion in the formation of the crystal structures of chemical compounds, but rather a critical criterion.
References
More filters
Journal ArticleDOI
Femtosecond solvation dynamics of water
TL;DR: In this paper, the authors present experimental measurements of the ultrafast solvation dynamics of a coumarin salt in water, and combine them with computer simulations to demonstrate that a solvent response on a timescale faster than 50 fs can dominate aqueous solvation dynamic.
Journal ArticleDOI
Picosecond solvation dynamics of coumarin 153: The importance of molecular aspects of solvation
TL;DR: In this paper, a probe molecule coumarin 153 (Cu153) and picosecond spectroscopic techniques were used to examine the solvation dynamics in polar liquids and showed that the frequency of the electronic spectrum of this probe provides a convenient measure of solvation energetics.
Journal ArticleDOI
Solvent effects on emission yield and lifetime for coumarin laser dyes. Requirements for a rotatory decay mechanism
TL;DR: In this paper, photophysical parameters have been determined for coumarin laser dyes in a variety of organic solvents, water, and mixed media, showing that substituent influences resulted in enlarged excited-state dipole moments for the fluorescent state.
Solvent effects on emission yield and lifetime for coumarin laser dyes. Requirements for a rotatory decay mechanism
TL;DR: In this paper, photophysical parameters have been determined for coumarin laser dyes in a variety of organic solvents, water, and mixed media, showing that substituent influences resulted in enlarged excited-state dipole moments for the fluorescent state.
Journal ArticleDOI
Ultrafast hydrogen-bond dynamics in the infrared spectroscopy of water.
TL;DR: Using simulations of an atomistic model of water, this work relates frequency fluctuations in the OH-stretching frequency of HOD in liquid D2O with femtosecond infrared spectroscopy to intermolecular dynamics.
Related Papers (5)
The isotope effect in solvation dynamics and nonadiabatic relaxation : a quantum simulation study of the photoexcited solvated electron in d2o
Polar solvation dynamics of h2o and d2o at the surface of zirconia nanoparticles
Debi D. Pant,Nancy E. Levinger +1 more
Deuterium isotope effect on the solvation dynamics of a dye molecule in methanol and acetonitrile
Sanghoon Lee,Jinho Lee,Taiha Joo +2 more