Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Colors and Magnetism03:02

Colors and Magnetism

14.4K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.4K
Valence Bond Theory02:42

Valence Bond Theory

11.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.5K
SN2 Reaction: Transition State02:26

SN2 Reaction: Transition State

12.5K
An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
When the nucleophile approaches the electrophilic carbon with its lone pairs, the halide acts as a leaving group and moves away with the electron-pair bonded to the carbon. Dotted partial bonds represent the bonds being formed or broken...
12.5K
Chemical Shift: Internal References and Solvent Effects01:17

Chemical Shift: Internal References and Solvent Effects

1.5K
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
1.5K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.1K
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.
3.1K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

2.6K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Concerns about anesthetic standardization and interpretability in the comparison of regional anesthesia with dexmedetomidine versus general anesthesia.

Breast (Edinburgh, Scotland)·2026
Same author

Metabolic dysfunction-associated fatty liver disease and its clinical implications in heart failure.

Fukushima journal of medical science·2026
Same author

Vapor-Controlled Full-Color Luminescence in Platinum(II) Complexes Bearing N-Heterocyclic Carbene and a Flexible Alkyl Chain.

Angewandte Chemie (International ed. in English)·2026
Same author

Switchable photoluminescence of europium(III) complexes with chromonylhydrazones.

Chemical communications (Cambridge, England)·2026
Same author

Respiratory prehabilitation implemented successful perioperative management in an adult patient with severe spinal deformity caused by scoliosis.

Minerva anestesiologica·2026
Same author

The study condition of implementing similar anaesthetic depth with different anaesthetic agents may be challenging.

European journal of anaesthesiology·2026

Related Experiment Video

Updated: Mar 8, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.8K

Methanol-Triggered Vapochromism Coupled with Solid-State Spin Switching in a Nickel(II)-Quinonoid Complex.

Paramita Kar1, Masaki Yoshida1, Yasuhiro Shigeta1

  • 1Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, Hokkaido, 060-0810, Japan.

Angewandte Chemie (International Ed. in English)
|January 24, 2017
PubMed
Summary

A novel nickel-quinonoid complex shows a color change and structural transformation upon methanol vapor uptake. This discovery offers potential for advanced chemical sensors and smart materials.

Keywords:
methanolnickel complexessolid-phase geometrical transformationspin-state switchingvapochromism

More Related Videos

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
16:11

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

2.8K
High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

6.9K

Related Experiment Videos

Last Updated: Mar 8, 2026

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
06:53

Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks

Published on: June 9, 2023

2.8K
Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry
16:11

Thermochemical Studies of NiII and ZnII Ternary Complexes Using Ion Mobility-Mass Spectrometry

Published on: June 8, 2022

2.8K
High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

6.9K

Area of Science:

  • Coordination Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Vapochromic materials change color in response to vapor adsorption.
  • Nickel(II) complexes can exhibit diverse coordination geometries and spin states.
  • Quinonoid ligands offer tunable electronic and structural properties.

Purpose of the Study:

  • To develop a methanol-selective vapochromic material.
  • To investigate the structural and electronic changes in a nickel-quinonoid complex upon vapor interaction.
  • To explore the potential applications of this material in sensing and memory devices.

Main Methods:

  • Synthesis of the nickel-quinonoid complex [Ni(HLMe)2].
  • Exposure of the solid-state complex to methanol vapor.
  • Characterization of structural, optical (color change), and magnetic (spin-state switching) properties.
  • Investigation of structure-property relationships through ligand modification.

Main Results:

  • The nickel-quinonoid complex exhibits a reversible vapochromic response to methanol vapor, changing color from purple to orange.
  • A reversible structural transformation occurs, involving a change in nickel coordination geometry from square-planar to octahedral.
  • Temperature-robust spin-state switching is observed in the solid state under ambient conditions.
  • Fine structural modifications of the quinonoid ligand (e.g., methyl or ethyl analogues) influence the observed properties.

Conclusions:

  • A highly methanol-selective vapochromic nickel-quinonoid complex has been successfully developed.
  • The material demonstrates reversible structural, colorimetric, and magnetic responses to methanol vapor.
  • This system holds significant promise for applications in chemical sensors, memory devices, and smart responsive materials.