Related Experiment Video
Updated: Jan 19, 2026
Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
Published on: May 4, 2011
Mechanoluminescence or Room-Temperature Phosphorescence: Molecular Packing-Dependent Emission Response
Jinfeng Wang1, Zhaofei Chai1, Jiaqiang Wang1
1Sauvage Center for Molecular Sciences, Department of Chemistry, Wuhan University, Wuhan, 430072, China.
Abstract:
Mechanoluminescence (ML) and room-temperature photophosphorescence (RTP) were achieved in polymorphisms of a triphenylamine derivative with ortho-substitution. This molecular packing-dependent emission afforded crucial information to deeply understand the intrinsic mechanism of different emission forms and the possible packing-function relationship. With the incorporation of solid-state 13 C NMR spectra of single crystals, as well as the analysis of crystal structures, the preferred packing modes for ML and/or RTP were investigated in detail, which can guide the reasonable design of organic molecules with special light-emission properties.
Related Concept Videos
08:58Cerebral Blood Oxygenation Measurement Based on Oxygen-dependent Quenching of Phosphorescence
02:55Temperature Dependence on Reaction Rate
Atoms, molecules, or ions must collide before they can react with each other. Atoms must be close together to form chemical bonds. This premise is the basis for a theory that explains many observations regarding chemical kinetics, including factors affecting reaction rates.
The collision theory is based on the postulates that (i) the reaction rate is proportional to the rate of reactant collisions, (ii) the reacting species collide in an orientation allowing contact between...
03:17Temperature Dependence
The reaction rate is the speed at which a chemical reaction occurs. The reaction rate is defined as the change in concentration of a component in the reaction with time. The speed of a reaction depends on several factors, including the concentration of reactants and the temperature at which the reaction is performed. Each reactant contributes to the speed of the reaction by a specific factor. This relationship is defined by the reaction rate law.
Rate Law
The rate law is an...
10:50Temperature Dependence
03:40Temperature Dependence
04:58Mechanoluminescent Visualization of Crack Propagation for Joint Evaluation