Photochromic Hydrazone
Photochromic Hydrazone - Related Videos
09:33
Determination of the Photoisomerization Quantum Yield of a Hydrazone Photoswitch
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2022
Photoisomerization quantum yield is a fundamental photophysical property that should be accurately determined in the investigation of newly developed photoswitches. Here, we describe a set of procedures to measure the photoisomerization quantum yield of a photochromic hydrazone as a model bistable photoswitch.
06:52
Ozonolysis of Alkenes
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2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate an example of an ozonolysis reaction to synthesize vanillin from isoeugenol (Figure 1). Ozonolysis of alkenes, an oxidation reaction between ozone and an alkene, is a common method to prepare aldehydes, ketones, and carboxylic acids. This experiment also demonstrates the use of an ozone generator and a low temperature (−78 °C) reaction. Figure 1. Diagram showing...
15:03
Identification of Unknown Aldehydes and Ketones - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA DNPH Test for Aromatic Aldehydes and KetonesExpand In this lab, you'll use the DNPH test, the Tollens' test, and the iodoform test to identify two unknown aldehydes or ketones. You'll use butanone and benzaldehyde as known compounds to confirm that the tests are working as expected. You'll start the lab with the DNPH test, which relies on the reaction between 2,4-dinitrophenylhydrazine, or DNPH,...
03:09
Identification of Unknown Aldehydes and Ketones - Concepts
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2020
Aldehydes and Ketones Aldehydes and ketones have a carbonyl group (C=O) as a functional group. A ketone has two alkyl or aryl groups attached to the carbonyl carbon (RCOR’). The simplest ketone is acetone, which has two methyl groups attached to the carbonyl carbon (CH3COCH3). An aldehyde is similar to a ketone, except that instead of two side groups connected to the carbonyl carbon, they have at least one hydrogen (RCOH). The simplest aldehyde is formaldehyde (HCOH), as it has two hydrogens...
12:00
Preparation of Light-responsive Membranes by a Combined Surface Grafting and Postmodification Process
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Cited by 3 •
2014
A plasma-induced polymerization procedure is described for the surface-initiated polymerization on polymer membranes. Further postmodification of the grafted polymer with photochromic substances is presented with a protocol of conducting permeability measurements of light-responsive membranes.
FAQs
Light-induced excitation can reorganize the hydrazone through E/Z isomerization around its carbon-nitrogen double bond or through hydrazone-ketone tautomerization. These pathways change the molecule’s structure and electronic arrangement, which can modify conjugation and shift light absorption. Determining which pathway dominates helps explain why related compounds may display different switching behavior under comparable illumination.
Conjugation links electronically interacting parts of a molecule, so structural changes can alter the wavelengths of light it absorbs. When illumination changes the hydrazone arrangement or tautomeric form, the resulting conjugation shift may produce a visible color change or another optical response. This connection allows molecular structure to be related directly to the observed switching signal.
Molecular structure, substituents, solvent, and acidity all influence the behavior of photochromic hydrazones. These variables can affect how readily the compound changes configuration, how long the altered state persists, and how efficiently it returns to its original form. Controlling them is therefore important when tuning a system for reversible switching, sensing, or optical-material studies.
A basic investigation compares the compound before and after illumination, then monitors recovery through thermal relaxation or exposure to another wavelength. The comparison focuses on changes in color or optical properties and on whether the original state returns reversibly. Varying illumination conditions, solvent, acidity, or molecular structure can reveal which factors control the switching cycle.
Their reversible optical response supports chemical sensing, data storage, optical materials, and stimuli-responsive systems. In sensing, a light-dependent change can provide a measurable signal; in storage and materials research, distinct optical states can represent or control information. Their tunability also makes them useful for investigating how molecular structure governs reversible photochemical behavior.
These compounds provide a tunable platform for connecting molecular structure with reversible photochemical behavior. Chemists can study how the hydrazone group, substituents, solvent, and acidity influence optical changes and recovery pathways. That combination of structural control and observable switching makes them relevant to investigations of molecular design, responsive chemical systems, and light-controlled material properties.