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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Variables Affecting Phosphorescence and Fluorescence01:26

Variables Affecting Phosphorescence and Fluorescence

Fluorescence and phosphorescence are essential phenomena in fields like analytical chemistry, biological imaging, and materials science, where they detect molecular properties and visualize cellular structures. Understanding the variables that influence these luminescent behaviors is crucial for maximizing accuracy and efficiency in their applications. These variables can broadly be grouped into chemical structure, solvent properties, and external conditions, each playing a distinct role in...
Photoluminescence: Fluorescence and Phosphorescence01:23

Photoluminescence: Fluorescence and Phosphorescence

Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
Fluorescence and Phosphorescence: Instrumentation01:25

Fluorescence and Phosphorescence: Instrumentation

Fluorometers and spectrofluorometers are two types of instruments used for measuring molecular fluorescence. These instruments differ in how they select excitation and emission wavelengths and the type of light sources they utilize. Fluorometers use absorption interference filters to choose excitation and emission wavelengths. The excitation source in a fluorometer is typically a low-pressure mercury vapor lamp that emits intense lines distributed throughout the ultraviolet and visible regions.

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Cation-templated synthesis of a Fe<sub>4</sub>Co<sub>20</sub> cyanometallate cluster.

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Updated: May 19, 2026

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
12:51

A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles

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Fast and Specific Mechano- and Vapochromic Switching in Phosphorescent Estrone-Based Pt(II) Complexes.

Bo Tu1, Bao Zhang1, Qingping Yang1

  • 1College of Chemistry, Sichuan University, Chengdu, P. R. China.

Chemistry, an Asian Journal
|May 18, 2026
PubMed
Summary

New platinum(II) complexes with a chiral estrone fragment enable rapid and specific mechanochromic and vapochromic sensing. These materials show promise for anti-counterfeiting applications due to their unique luminescence changes.

Keywords:
Pt(II) complexestronemechanochromphosphorescencevapochrom

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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
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Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Photochemistry

Background:

  • Mechanochromic and vapochromic materials are crucial for sensing applications.
  • Existing materials often lack rapid switching, specificity, and repeatability.
  • There is a need for advanced molecular systems that respond to external stimuli.

Purpose of the Study:

  • To synthesize novel phosphorescent platinum(II) complexes for mechanochromic and vapochromic applications.
  • To investigate the structure-property relationships governing the responsive behavior.
  • To explore potential applications in anti-counterfeiting technologies.

Main Methods:

  • Synthesis of platinum(II) complexes incorporating a chiral estrone fragment.
  • X-ray diffraction (XRD) and Density Functional Theory (DFT) calculations for structural analysis.
  • Luminescence spectroscopy to study mechanochromic and vapochromic responses.
  • Acetone vapor exposure tests to evaluate specificity and response time.

Main Results:

  • Highly phosphorescent Pt(II) complexes with emission quantum yields up to 74.5% were synthesized.
  • A porous, layered micro-nanostructure was formed, facilitating stimuli-responsive switching.
  • The Pt1 film demonstrated rapid ( < 0.5 s) and specific luminescence changes (red to green) upon exposure to acetone vapor.
  • Solvent spray technology enabled multilevel-code anti-counterfeiting with a 3.0 s recovery time.

Conclusions:

  • The synthesized Pt(II) complexes exhibit excellent mechanochromic and vapochromic properties with high specificity to acetone.
  • The estrone fragment plays a key role in self-assembly and the formation of responsive micro-nanostructures.
  • These materials offer a promising platform for developing advanced sensing and anti-counterfeiting solutions.