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

Nuclear Stability03:18

Nuclear Stability

23.3K
Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together...
23.3K
RNA Stability01:53

RNA Stability

35.7K
Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
35.7K
Stability01:28

Stability

418
The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
The stability of an LTI system is determined by the roots of its characteristic equation, known as poles. A system is stable if it produces a bounded...
418
Stability of structures01:14

Stability of structures

523
In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
523
Pole and System Stability01:24

Pole and System Stability

966
The transfer function is a fundamental concept representing the ratio of two polynomials. The numerator and denominator encapsulate the system's dynamics. The zeros and poles of this transfer function are critical in determining the system's behavior and stability.
Simple poles are unique roots of the denominator polynomial. Each simple pole corresponds to a distinct solution to the system's characteristic equation, typically resulting in exponential decay terms in the system's...
966
Multimachine Stability01:25

Multimachine Stability

581
Multimachine stability analysis is crucial for understanding the dynamics and stability of power systems with multiple synchronous machines. The objective is to solve the swing equations for a network of M machines connected to an N-bus power system.
In analyzing the system, the nodal equations represent the relationship between bus voltages, machine voltages, and machine currents. The nodal equation is given by:
581

You might also read

Related Articles

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

Sort by
Same author

Manifestation of Ground-State Baird Aromaticity in a Neutral Hexaazaphenanthrene Derivative with a Topologically Unanticipated Triplet Ground State.

Journal of the American Chemical Society·2026
Same author

Metalations of a Carbazole-Incorporated N-Confused Porphyrin.

Organic letters·2026
Same author

Incidence, Timing and Associated Factors of In-Stent Restenosis after CASPER Placement: A Single-Center Retrospective Study.

Journal of neuroendovascular therapy·2026
Same author

Meso-Strap Engineering of Aromaticity Redistribution in Porphyrinoids.

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

Correction to "Electron Transfer Enhanced by a Minimal Energetic Driving Force at the Organic-Semiconductor Interface".

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

Author Correction: Blue organic light-emitting diode with a turn-on voltage of 1.47V.

Nature communications·2026
Same journal

Harnessing Naphthalimide Scaffolds for Sustainable CO<sub>2</sub> Utilization: A Metal-, Halide-, and Solvent-Free Photocatalytic CO<sub>2</sub> Cycloaddition via Sequential Two-Photon Activation.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Protein-Independent Liquid-Liquid Phase Separation of Adenosine Triphosphate Under Crowded Conditions.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

A Unified Approach for the Synthesis of Conformationally Locked and sp<sup>2</sup>-sp<sup>3</sup> Fused Hybrids.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Decoding Heptazine Architectures: From Molecular Association to Structural Insight.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

An Electrophilic Uridine Building Block for Post-Synthetic RNA Modification as Exemplified for Spin Labeling.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same journal

Recent Advances in Pd-Catalyzed Directed meta-C-H Olefination: Strategies and Outlook.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
See all related articles

Related Experiment Video

Updated: Feb 2, 2026

Author Spotlight: Porphyrin-Modified Beads for Use as Compensation Controls in Flow Cytometry
10:06

Author Spotlight: Porphyrin-Modified Beads for Use as Compensation Controls in Flow Cytometry

Published on: March 24, 2023

3.0K

Porphyrin-Stabilized Nitrenium Dication.

Keisuke Fujimoto1, Daiki Shimizu1, Atsuhiro Osuka1

  • 1Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku Kyoto, 606-8502, Japan.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|November 8, 2018
PubMed
Summary
This summary is machine-generated.

Researchers synthesized novel azepine-fused nickel(II)-porphyrin dimers. These compounds, upon oxidation, yielded stable nitrenium dications, offering new insights into reactive intermediates in porphyrin chemistry.

Keywords:
aminyl radicalsazepinedicationsnitrenium ionsporphyrin dimers

More Related Videos

Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
07:59

Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets

Published on: October 15, 2021

4.0K
How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
07:22

How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project

Published on: February 11, 2019

29.2K

Related Experiment Videos

Last Updated: Feb 2, 2026

Author Spotlight: Porphyrin-Modified Beads for Use as Compensation Controls in Flow Cytometry
10:06

Author Spotlight: Porphyrin-Modified Beads for Use as Compensation Controls in Flow Cytometry

Published on: March 24, 2023

3.0K
Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets
07:59

Synthesis and Characterization of Multi-Modal Phase-Change Porphyrin Droplets

Published on: October 15, 2021

4.0K
How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project
07:22

How to Stabilize Protein: Stability Screens for Thermal Shift Assays and Nano Differential Scanning Fluorimetry in the Virus-X Project

Published on: February 11, 2019

29.2K

Area of Science:

  • Organometallic Chemistry
  • Porphyrin Chemistry
  • Synthetic Organic Chemistry

Background:

  • Nickel(II)-porphyrin dimers are important in catalysis and materials science.
  • The generation and characterization of reactive nitrogen species in porphyrin systems remain challenging.
  • Stable nitrenium dications are rare and their properties are not well understood.

Purpose of the Study:

  • To synthesize novel azepine-fused Ni(II)-porphyrin dimers.
  • To investigate the oxidation pathways and properties of these dimers, focusing on nitrenium ion and dication formation.
  • To explore the stability and characteristics of the generated nitrenium dications.

Main Methods:

  • Oxidative amination of a β-β linked Ni(II)-porphyrin dimer.
  • Buchwald-Hartwig amination for N-aryl congener synthesis.
  • Electrochemical and spectroscopic methods for characterization.

Main Results:

  • Successful synthesis of azepine-fused Ni(II)-porphyrin dimers.
  • Sequential generation of aminyl radical and nitrenium ion from the NH congener.
  • Single-step, two-electron oxidation to afford a stable nitrenium dication from the N-aryl congener.
  • Enhanced stability of the nitrenium dication via chlorine substitution.

Conclusions:

  • Azepine-fused Ni(II)-porphyrin dimers serve as effective precursors for nitrenium ions and dications.
  • The study demonstrates the successful generation and characterization of rare, stable nitrenium dications.
  • Chlorine substitution enhances the stability of these novel porphyrin-based nitrenium dications.