Role of Solvent, pH, and Molecular Size in Excited-State Deactivation of Key Eumelanin Building Blocks: Implications for Melanin Pigment Photostability

2008 ◽  
Vol 130 (50) ◽  
pp. 17038-17043 ◽  
Author(s):  
M. Gauden ◽  
A. Pezzella ◽  
L. Panzella ◽  
M. T. Neves-Petersen ◽  
E. Skovsen ◽  
...  
Keyword(s):  
Excited State ◽  
Molecular Size ◽  
Building Blocks ◽  
Melanin Pigment ◽  
Role Of Solvent

Role of Solvent in Excited-State Proton Transfer in Hypericin

1994 ◽  
Vol 98 (34) ◽  
pp. 8352-8358 ◽  
Author(s):  
F. Gai ◽  
M. J. Fehr ◽  
J. W. Petrich
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Excited State Proton Transfer ◽  
Role Of Solvent

Lamotriginium crotonate and lamotriginium salicylate ethanol monosolvate: the role of solvent molecules in the packing organization

2017 ◽  
Vol 73 (7) ◽  
pp. 563-568
Author(s):  
Eleonora Freire ◽  
Gustavo A. Echeverría ◽  
Ricardo Baggio
Keyword(s):  
Crystal Structure ◽  
Building Blocks ◽  
Solvent Molecules ◽  
Role Of Solvent ◽  
The Way ◽  
Hydrogen Bonded

Two lamotriginium salts, namely lamotriginium crotonate [systematic name: 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazin-2-ium but-2-enoate, C9H8Cl2N5 +·C4H5O2 −, (III)] and lamotriginium salicylate [systematic name: 3,5-diamino-6-(2,3-dichlorophenyl)-1,2,4-triazin-2-ium 2-hydroxybenzoate ethanol monosolvate, C9H8Cl2N5 +·C7H5O3 −·C2H5OH, (IV)] present extremely similar centrosymmetric hydrogen-bonded A...L...L...A packing building blocks (L is lamotriginium and A is the anion). The fact that salicylate salt (IV) is (ethanol) solvated, while crotonate salt (III) is not, has a profound effect on the way these elemental units aggregate to generate the final crystal structure. Possible reasons for this behaviour are analyzed and the hypothesis raised checked against similar structures in the literature.

scholarly journals Temperature-Dependence of Solvent-Induced Stokes Shift and Fluorescence Tunability in Carbon Nanodots

2019 ◽  
Vol 5 (2) ◽  
pp. 20 ◽  
Author(s):  
Sciortino ◽  
Cannas ◽  
Messina
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Low Temperature ◽  
Carbon Dots ◽  
Emission Band ◽  
Stokes Shift ◽  
Carbon Nanodots ◽  
Emission Mechanism ◽  
Role Of Solvent

We carried out a cryogenic investigation on the optical properties of carbon dots, aiming to better understand their emission mechanism and the role of the solvent. The solvatochromic Stokes shift is quantified by a low temperature approach which allows freezing of the photo-excited state of carbon dots, preventing any solvation relaxation. Moreover, the reduction in temperature helps to identify the dynamical inhomogeneous contribution to the broadening of the emission band; therefore, disentangling the role of solvent from other types of broadening, such as the homogeneous and the static inhomogeneous contributions.

Unravelling the early photochemical behavior of (8-substituted-7-hydroxyquinolinyl)methyl acetates through electronic structure theory and ultrafast transient absorption spectroscopy

2017 ◽  
Vol 19 (2) ◽  
pp. 1089-1096 ◽  
Author(s):  
Jiani Ma ◽  
Jan-Michael Mewes ◽  
Kyle T. Harris ◽  
Timothy M. Dore ◽  
David Lee Phillips ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Excited State ◽  
Excited States ◽  
Transient Absorption ◽  
Electronic Structure Theory ◽  
Transient Absorption Spectroscopy ◽  
Structure Theory ◽  
Proton Transfers ◽  
Role Of Solvent

Role of solvent, prototropic states, excited state proton transfers, and excited states on biological effector release from quinoline-based phototriggers.

Ground- and Excited-State Tautomerism in Anionic 2-(6‘-Hydroxy-2‘-pyridyl)benzimidazole:  Role of Solvent and Temperature†

2001 ◽  
Vol 105 (45) ◽  
pp. 10249-10260 ◽  
Author(s):  
M. Carmen Ríos Rodríguez ◽  
Manuel Mosquera ◽  
Flor Rodríguez-Prieto
Keyword(s):  
Excited State ◽  
Role Of Solvent

Dynamic adjustment of emission from both singlets and triplets: the role of excited state conformation relaxation and charge transfer in phenothiazine derivates

2021 ◽  
Author(s):  
Weidong Qiu ◽  
Xinyi Cai ◽  
Mengke Li ◽  
Liangying Wang ◽  
Yanmei He ◽  
...  
Keyword(s):  
Excited State ◽  
Charge Transfer ◽  
Intramolecular Charge Transfer ◽  
Dynamic Adjustment ◽  
Twisted Intramolecular Charge Transfer

Dynamic adjustment of emission behaviours by controlling the extent of twisted intramolecular charge transfer character in excited state.

Sign in / Sign up

Export Citation Format

Share Document