Tracking of the Molecular Motion in the Primary Event of Photoinduced Reactions of a Phytochromobilin Model

2013 ◽  
Vol 117 (50) ◽  
pp. 15976-15986 ◽  
Author(s):  
Xuhui Zhuang ◽  
Jun Wang ◽  
Zhenggang Lan
Keyword(s):  
Molecular Motion ◽  
Primary Event ◽  
Photoinduced Reactions

scholarly journals Computer simulation of photoinduced molecular motion and reactivity

2002 ◽  
Vol 4 (2) ◽  
pp. 57-68 ◽  
Author(s):  
Marco Garavelli ◽  
Fernando Bernardi ◽  
Michael A. Roob ◽  
Massimo Olivucci
Keyword(s):  
Photochemical Reaction ◽  
Molecular Motion ◽  
Chemical Processes ◽  
Proton Pumping ◽  
The Novel ◽  
Primary Event ◽  
Organic Chromophores ◽  
Wide Range ◽  
Retinal Chromophore ◽  
Molecular Deformation

The use of the computer to simulate light induced chemical processes has given access to a detailed description of the molecular motion and mechanism underlying the reactivity of organic and bio-organic chromophores. Thus, different computational strategies and tools can now be operated like “virtual spectrometers” to characterize the photoinduced molecular deformation and reactivity of a given chromophore. Furthermore, a systematic computer investigation of a wide range of photochemical organic reactions during the last decade, has lead to novel concepts that allow the chemist to formulate the mechanism of a photochemical reaction in a rigorous way and with a language which is familiar to chemists.In this review we will revise some basic mechanistic concepts which have emerged in the novel field of computational photochemistry. These comprise the concept of conical intersection funnels, photochemical paths, path branching and selectivity. Recent work in the field of biological photoreceptors has demonstrated that computational chemistry can be successfully applied to photobiological problems. Here we will revise the results of the photoisomerization path mapping of the protonated Schiff base of retinal, the chromophore of rhodopsin proteins. These studies have produced the “two-state two-mode model” which provides a description of the photon-induced molecular motion in the isolated retinal chromophore. Such model represents a substantial revisionof the previous models for the primary event invisioninan imals and light driven proton-pumping in halobacteriae.

Molecular motion in the van der Waals solid C6H6:C6F6

1992 ◽  
Vol 89 ◽  
pp. 1755-1766 ◽  
Author(s):  
JH Williams ◽  
RP White
Keyword(s):  
Molecular Motion ◽  
Van Der Waals

VIBRATIONAL SPECTROSCOPY, RESONANCE FRACTION AND MOLECULAR MOTION

1974 ◽  
Vol 35 (C6) ◽  
pp. C6-131-C6-137 ◽  
Author(s):  
Y. HAZONY ◽  
R. H. HERBER
Keyword(s):  
Vibrational Spectroscopy ◽  
Molecular Motion

Exterior and Interior Events in Early Stage of Thrombin-induced Platelet Aggregation

1977 ◽  
Vol 38 (03) ◽  
pp. 0630-0639 ◽  
Author(s):  
Shuichi Hashimoto ◽  
Sachiko Shibata ◽  
Bonro Kobayashi
Keyword(s):  
Molecular Weight ◽  
Enzyme Activity ◽  
Plasma Membrane ◽  
Platelet Aggregation ◽  
Early Stage ◽  
Adenyl Cyclase ◽  
Cellular Component ◽  
Primary Event ◽  
Rabbit Platelets ◽  
Membrane Bound

SummaryTreatment of washed rabbit platelets with 1 u/ml of thrombin at 37° C resulted in a disappearance from platelets of a protein with 250,000 dalton molecular weight which was shown to be originated from plasma membrane. Parallel loss of adenyl cyclase was noted, and both reactions were complete within 30 sec. From the patterns of disc electrophoretograms, the importance of quick suppression of thrombin action in demonstrating the primary event was stressed.Thrombin induced an apparent activation of membrane bound phosphodiesterase. This reaction was also complete within 30 sec. The cellular component which contained the enzyme activity was distinct from plasma membrane. Soluble phosphodiesterase was not influenced by thrombin at all.These reactions required intact platelet cells to react with thrombin, and no reaction was detected when subcellular preparations were treated with thrombin.Possibility of collaboration of changes in externally located synthetic enzyme with those in internally located degrading enzyme in the early phase of thrombin action on platelets was suggested.

Evidence of Molecular Motion

2019 ◽  
Vol 087 (04) ◽  
Author(s):  
Arthur Odom ◽  
Clare Bell
Keyword(s):  
Molecular Motion

Visualization and Manipulation of Molecular Motion in Solid State through Photo-Induced Clusteroluminescence

2019 ◽  
Author(s):  
Haoke Zhang ◽  
Lili Du ◽  
Lin Wang ◽  
Junkai Liu ◽  
Qing Wan ◽  
...  
Keyword(s):  
Quantum Mechanics ◽  
Excited State ◽  
Solid State ◽  
Light Source ◽  
Molecular Motion ◽  
Molecular Machine ◽  
Conjugated Molecules ◽  
Time Resolved ◽  
Packing Structure ◽  
New Strategy

<p>Building molecular machine has long been a dream of scientists as it is expected to revolutionize many aspects of technology and medicine. Implementing the solid-state molecular motion is the prerequisite for a practical molecular machine. However, few works on solid-state molecular motion have been reported and it is almost impossible to “see” the motion even if it happens. Here the light-driven molecular motion in solid state is discovered in two non-conjugated molecules <i>s</i>-DPE and <i>s</i>-DPE-TM, resulting in the formation of excited-state though-space complex (ESTSC). Meanwhile, the newly formed ESTSC generates an abnormal visible emission which is termed as clusteroluminescence. Notably, the original packing structure can recover from ESTSC when the light source is removed. These processes have been confirmed by time-resolved spectroscopy and quantum mechanics calculation. This work provides a new strategy to manipulate and “see” solid-state molecular motion and gains new insights into the mechanistic picture of clusteroluminescence.<br></p>

scholarly journals Self-assembly induced luminescence of Eu3+-complexes and application in bioimaging

2021 ◽  
Author(s):  
Ping-Ru Su ◽  
Tao Wang ◽  
Pan-Pan Zhou ◽  
Xiao-Xi Yang ◽  
Xiao-Xia Feng ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Rare Earth ◽  
Luminescence Intensity ◽  
Self Assembly ◽  
Room Temperature ◽  
Molecular Motion ◽  
Proof Of Concept ◽  
Room Temperature Phosphorescence ◽  
New Strategy ◽  
Size Controlled

Abstract Design and engineering of highly efficient emitting materials with assembly-induced luminescence, such as room temperature phosphorescence (RTP) and aggregation-induced emission (AIE), have stimulated extensive efforts. Here, we propose a new strategy to obtain size-controlled Eu3+-complex nanoparticles (Eu-NPs) with self-assembly induced luminescence (SAIL) characteristics without encapsulation or hybridization. Compared with previous RTP or AIE materials, the SAIL phenomena of increased luminescence intensity and lifetime in aqueous solution for the proposed Eu-NPs are due to the combined effect of self-assembly in confining the molecular motion and shielding the water quenching. As a proof of concept, we also show that this system can be further applied in bioimaging, temperature measurement and HClO sensing. The SAIL activity of the rare-earth (RE) system proposed here offers a further step forward on the roadmap for the development of RE light conversion systems and their integration in bioimaging and therapy applications.

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