Photoexcitation and Charge-Transfer-to-Solvent Relaxation Dynamics of the I–(CH3CN) Complex

2013 ◽  
Vol 117 (32) ◽  
pp. 7595-7605 ◽  
Author(s):  
Chun C. Mak ◽  
Qadir K. Timerghazin ◽  
Gilles H. Peslherbe
Keyword(s):  
Charge Transfer ◽  
Relaxation Dynamics ◽  
Solvent Relaxation

Preparation and Application of Fluorescent Bioconjugates in Probing the pH and Solvent Relaxation Dynamics in ZIF-8 Cavities

2021 ◽  
Author(s):  
Chung-Kai Tsai ◽  
Jyun-Ting Li ◽  
Shun-Ren Ke ◽  
Sung-Hung Li ◽  
Pei-Yu Huang ◽  
...  
Keyword(s):  
Relaxation Dynamics ◽  
Solvent Relaxation

scholarly journals Photoexcitation of Ge9− Clusters in THF: New Insights into the Ultrafast Relaxation Dynamics and the Influence of the Cation

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2639
Author(s):  
Nadine C. Michenfelder ◽  
Christian Gienger ◽  
Melina Dilanas ◽  
Andreas Schnepf ◽  
Andreas-Neil Unterreiner
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Conduction Band ◽  
Near Infrared ◽  
Transient Absorption ◽  
Time Window ◽  
Excess Electron ◽  
Cluster Core ◽  
Relaxation Dynamics ◽  
Additional Time

We present a comprehensive femtosecond (fs) transient absorption study of the [Ge9(Hyp)3]− (Hyp = Si(SiMe3)3) cluster solvated in tetrahydrofuran (THF) with special emphasis on intra- and intermolecular charge transfer mechanisms which can be tuned by exchange of the counterion and by dimerization of the cluster. The examination of the visible and the near infrared (NIR) spectral range reveals four different processes of cluster dynamics after UV (267/258 nm) photoexcitation related to charge transfer to solvent and localized excited states in the cluster. The resulting transient absorption is mainly observed in the NIR region. In the UV-Vis range transient absorption of the (neutral) cluster core with similar dynamics can be observed. By transferring concepts of: (i) charge transfer to the solvent known from solvated Na− in THF and (ii) charge transfer in bulk-like materials on metalloid cluster systems containing [Ge9(Hyp)3]− moieties, we can nicely interpret the experimental findings for the different compounds. The first process occurs on a fs timescale and is attributed to localization of the excited electron in the quasi-conduction band/excited state which competes with a charge transfer to the solvent. The latter leads to an excess electron initially located in the vicinity of the parent cluster within the same solvent shell. In a second step, it can recombine with the cluster core with time constants in the picosecond (ps) timescale. Some electrons can escape the influence of the cluster leading to a solvated electron or after interaction with a cation to a contact pair both with lifetimes exceeding our experimentally accessible time window of 1 nanosecond (ns). An additional time constant on a tens of ps timescale is pronounced in the UV-Vis range which can be attributed to the recombination rate of the excited state or quasi conduction band of Ge9−. In the dimer, the excess electron cannot escape the molecule due to strong trapping by the Zn cation that links the two cluster cores.

EXCITONS IN QUASI-ONE-DIMENSIONAL CRYSTALLINE PERYLENE DERIVATIVES: BAND STRUCTURE AND RELAXATION DYNAMICS

2001 ◽  
Vol 15 (28n30) ◽  
pp. 3597-3600
Author(s):  
M. HOFFMANN ◽  
T. HASCHE ◽  
K. SCHMIDT ◽  
T. W. CANZLER ◽  
V. M. AGRANOVICH ◽  
...  
Keyword(s):  
Charge Transfer ◽  
Band Structure ◽  
Quantum Chemical ◽  
Relaxation Dynamics ◽  
Charge Transfer Transition ◽  
Transition Dipole ◽  
One Dimensional ◽  
Perylene Derivatives ◽  
Charge Transfer Excitons ◽  
Fitting Parameters

The exciton structure of crystalline MePTCDI (N-N'-dimethylperylene-3,4,9,10-dicarboximide) is modeled by a one-dimensional Hamiltonian, which includes the interactions between Frenkel excitons with several vibronic levels and charge-transfer excitons. Using appropriate fitting parameters, which are verified by quantum chemical calculations, this model can explain the main features of the low temperature absorption spectrum. Polarized absorption spectra show different polarization ratios for the various peaks. This polarization behavior is explained by the varying contribution of the charge-transfer transition dipole, which has a direction different from the Frenkel transition dipole. Our model for the exciton band structure is supported by transient emission measurements.

Electronic and Solvent Relaxation Dynamics of a Photoexcited Aqueous Halide

1996 ◽  
Vol 100 (4) ◽  
pp. 1295-1302 ◽  
Author(s):  
Wen-Shyan Sheu ◽  
Peter J. Rossky
Keyword(s):  
Relaxation Dynamics ◽  
Solvent Relaxation

Solvent relaxation dynamics and electron transfer

1993 ◽  
Vol 176 (2-3) ◽  
pp. 467-481 ◽  
Author(s):  
M. Bixon ◽  
Joshua Jortner
Keyword(s):  
Electron Transfer ◽  
Relaxation Dynamics ◽  
Solvent Relaxation
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