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Related Concept Videos

Stereoisomerism02:52

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...
Structural Isomerism02:34

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 be...
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene π orbitals.
2D NMR: Overview of Heteronuclear Correlation Techniques01:18

2D NMR: Overview of Heteronuclear Correlation Techniques

Heteronuclear correlation spectroscopy is an analytical technique that investigates the coupling between different types of nuclei, often a proton and an X-nucleus, such as carbon-13 or nitrogen-15. This method is commonly used in nuclear magnetic resonance (NMR) spectroscopy to gain insights into complex chemical compounds' structural and compositional aspects. A typical heteronuclear correlation spectrum displays X-nucleus chemical shifts on one axis and a proton spectrum on the other axis.
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.

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Related Experiment Video

Updated: Jul 4, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
04:57

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Published on: July 18, 2025

Heteronuclear MOF Heterostructures Based on Identical Auxiliary-Ligand Bridging for Multi-Function-Integrated

Qianni Peng1, Zhuoyan Dong1, Yixin Chen1

  • 1Fujian Key Laboratory of Polymer Materials, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, China.

Advanced Materials (Deerfield Beach, Fla.)
|July 3, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed novel heteronuclear Metal-Organic Framework (MOF) heterostructures. These MOFs enable multi-functional integrated photonic devices by combining distinct optical properties within a single structure.

Keywords:
MOFheteronuclear ligandsoptical heterostructurephoton transmissionstimuli response

Related Experiment Videos

Last Updated: Jul 4, 2026

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
04:57

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

Published on: July 18, 2025

Area of Science:

  • Materials Science
  • Nanotechnology
  • Photonics

Background:

  • Metal-Organic Framework (MOF) heterostructures offer potential for integrated photonic devices.
  • Current MOF heterostructures often use similar ligands, limiting functional integration.
  • Achieving multi-segmented emission and responsiveness in MOFs remains a challenge.

Purpose of the Study:

  • To report the first heteronuclear MOF heterostructure using an identical auxiliary-ligand bridging strategy.
  • To enable multi-function integration in photonic devices through designed MOF heterostructures.
  • To overcome limitations of homologous ligand assembly in MOFs.

Main Methods:

  • Designed ligands with distinct chromophore structures were synthesized.
  • Epitaxial assembly of these ligands was achieved using an identical auxiliary-ligand bridging method.
  • Construction of heteronuclear MOF heterostructures was performed.

Main Results:

  • The heteronuclear MOF heterostructures exhibited distinct energy-level structures due to varied ligand chromophores.
  • Different photonic functionalities, including light sources, optical modulation, and waveguides, were integrated.
  • The heterostructures demonstrated dynamic logic gate operations, serving as a prototype for integrated photonic circuits.

Conclusions:

  • A novel strategy for constructing heteronuclear MOF heterostructures was established.
  • This approach allows for the simultaneous integration of diverse photonic functionalities.
  • The developed MOF heterostructures pave the way for advanced multifunctional integrated photonic devices.