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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Stereoisomerism02:52

Stereoisomerism

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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...
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π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

11.3K
Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
11.3K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

1.8K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
1.8K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.6K
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...
2.6K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.5K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
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Related Experiment Video

Updated: Jan 15, 2026

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Triple Integration of π-Conjugated Building Blocks: Unprecedented Assembly for Large Optical Anisotropy.

Ruyi Niu1,2, Xiaona Li1,2, Zhihua Yang1,2

  • 1Research Center for Crystal Materials, CAS Key Laboratory of Functional Materials and Devices for Special Environmental Conditions, Xinjiang Key Laboratory of Functional Crystal Materials, Chinese Academy of Sciences, Xinjiang Technical Institute of Physics and Chemistry, 40-1 South Beijing Road, Urumqi, 830011, China.

Small (Weinheim an Der Bergstrasse, Germany)
|October 7, 2025
PubMed
Summary

Hydrogen bonding (H-bonding) enables directional molecular alignment, crucial for creating advanced optical crystals with high optical anisotropy. This study introduces a novel birefringent crystal with record birefringence, ideal for UV applications.

Keywords:
high‐performance birefringent crystalhydrogen bondingthe first‐principles calculationsπ‐conjugated groups

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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Area of Science:

  • Materials Science
  • Crystallography
  • Optics

Background:

  • Achieving enhanced optical anisotropy in crystals requires coherent alignment of diverse π-conjugated units.
  • Aligning disparate π-systems into a single architecture is a significant challenge in materials design.

Purpose of the Study:

  • To design and synthesize a novel birefringent crystal with enhanced optical anisotropy.
  • To investigate the role of hydrogen bonding (H-bonding) in directing the assembly of π-conjugated units for optical applications.

Main Methods:

  • Synthesis of a novel birefringent crystal: Cs2[B3O3F2(OH)2](NO3)·[B3O3(OH)3].
  • Utilizing complementary H-bonding interactions to direct the assembly of three distinct π-conjugated building blocks.
  • Characterization of optical properties, including birefringence and bandgap.
  • First-principles calculations to confirm the mechanism of optical anisotropy.

Main Results:

  • A novel crystal, Cs2[B3O3F2(OH)2](NO3)·[B3O3(OH)3], was successfully synthesized.
  • The crystal exhibits a record-high birefringence (Δn = 0.149@546 nm) among alkali/alkaline-earth metal borates.
  • A large bandgap of 5.82 eV was achieved, suitable for UV applications.
  • H-bonding was confirmed as the key mechanism for directional molecular alignment and overcoming assembly limitations.

Conclusions:

  • Directional molecular alignment driven by H-bonding is critical for engineering high-performance birefringent crystals.
  • The novel crystal establishes a new paradigm for assembling diverse π-conjugated units.
  • This approach enables the development of advanced optical materials with superior properties for UV applications.