Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

Valence Bond Theory

Valence Bond Theory

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...

Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

Intramolecular Claisen Condensation of Dicarboxylic Esters: Dieckmann Cyclization

Dieckmann cyclization is an intramolecular Claisen condensation of diesters. The reaction occurs in the presence of a base and generates a cyclic β-ketoester as the final product. Commonly, 1, 6 and 1, 7-diesters are preferred substrates for the reaction since the generated five, and six-membered cyclic β-keto esters are particularly more stable.

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

Structural Isomerism

Structural Isomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...

You might also read

Related Articles

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

Sort by

Same author

The topology of the magnetically induced ring current of C<sub>13</sub>Cl<sub>2</sub>.

Chemical science·2026

Same author

Synthesis and characterization of honeycomb-like carboxylate-bridged dimeric Cu(II) and Zn(II)-based coordination polymers with a pyridyl Schiff base linker: dye sorption and Schottky device applications.

Dalton transactions (Cambridge, England : 2003)·2026

Same author

Record-Breaking Asymmetric Hysteresis Width Greater Than 100 K Spanning Room Temperature in Mn(III)-Based Spin-Crossover Materials Enabled by 2D Hydrogen-Bonding Cooperativity.

Angewandte Chemie (International ed. in English)·2026

Same author

Tuning magnetic exchange and relaxation dynamics in dinuclear Dy(III) single-molecule magnets <i>via</i> co-ligand modulation on a hydrazone-based Schiff base platform.

Dalton transactions (Cambridge, England : 2003)·2026

Same author

Triply-Linked N-Confused Porphyrin Dimers: Cross Conjugation-Mediated Expansion of π-Conjugation.

Angewandte Chemie (International ed. in English)·2026

Same author

Change of the aromatic nature through face-to-face stacking.

Chemical science·2026

Search research articles

Related Experiment Video

Updated: Sep 19, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

E-Stilbene-Imprinted Cyclic Diphyrin and Its B^III Complex.

Rampal Vishwakarma¹, Daniel Blasco², Dage Sundholm³

¹School of Chemical Sciences, National Institute of Science Education and Research (NISER), An OCC of Homi Bhabha National Institute, Bhubaneswar, Odisha 752050, India.

Organic Letters

|June 9, 2025

Summary

This study introduces a novel contracted porphyrinoid, an E-stilbene-imprinted cyclic diphyrin, which exhibits non-aromaticity. Complexation with Boron(III) ions transforms this molecule from non-emissive to emissive, highlighting its potential in materials science.

More Related Videos

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Published on: February 7, 2019

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Published on: November 22, 2016

Related Experiment Videos

Last Updated: Sep 19, 2025

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

Published on: February 7, 2019

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Published on: November 22, 2016

Area of Science:

Organic Chemistry
Supramolecular Chemistry
Materials Science

Background:

Aromaticity in macrocycles depends on global and local π-conjugation.
Controlling conjugation pathways is key to designing novel molecular systems.

Purpose of the Study:

To synthesize and characterize a novel E-stilbene-imprinted cyclic diphyrin.
To investigate the impact of structural modifications on aromaticity and conjugation.
To explore the photophysical properties of the diphyrin upon metal complexation.

Main Methods:

Synthesis of the E-stilbene-imprinted cyclic diphyrin.
Structural characterization using NMR spectroscopy and X-ray crystallography.
Photophysical studies including UV-Vis absorption and fluorescence spectroscopy.
Complexation studies with Boron(III) ions.

Main Results:

A new class of contracted porphyrinoid, cyclic diphyrin, was successfully synthesized.
The ethylene twist in the E-stilbene unit disrupts global conjugation, leading to non-aromaticity.
Complexation with Boron(III) ions induced asymmetric ring formation and transformed the non-emissive diphyrin into an emissive species in solution.

Conclusions:

The synthesized cyclic diphyrin represents a new structural motif in porphyrinoid chemistry.
Disruption of global conjugation can lead to non-aromaticity while preserving local aromaticity.
Metal-induced conformational changes can tune the photophysical properties of macrocyclic systems.