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π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

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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...
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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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UV–Vis Spectroscopy of Conjugated Systems01:32

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Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
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UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
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An allyl group is a three-carbon conjugated system where the sp³-hybridized allylic carbon is bonded to a CH=CH2 group via a single bond. Allyl anions can be obtained by treating propene with a strong base that can deprotonate methyl groups. Allyl cations are formed as intermediates during substitution reactions involving allylic halides. In both cases, the hybridization of the allylic carbon changes from sp3 to sp2, giving rise to a carbon chain with three sp2-hybridized carbons, each with...
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A Second-Order Nonlinear Optical Material Consisting of Two π-Conjugated Groups.

Minjuan Li1,2, Ziyi Wang1,2, Belal Ahmed3

  • 1College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116, China.

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|March 11, 2023
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Summary

A new nonlinear optical (NLO) material, GU3TMT, shows a large NLO response. First-principles calculations reveal that π-conjugated rings are key to its optical properties.

Keywords:
first-principles calculationsnonlinear opticsoptoelectronicsstructure-property relationshipstrithiocyanates

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Area of Science:

  • Materials Science
  • Crystallography
  • Optics

Background:

  • Nonlinear optical (NLO) materials are crucial for advanced optical applications.
  • Developing new NLO materials with enhanced properties is an ongoing research area.
  • Understanding the relationship between molecular structure and NLO response is essential for rational material design.

Purpose of the Study:

  • To report a novel second-order nonlinear optical (NLO) material, [C(NH2)3]3C3N3S3 (GU3TMT).
  • To investigate the NLO properties and birefringence of GU3TMT.
  • To elucidate the origin of the NLO response through theoretical calculations.

Main Methods:

  • Synthesis and characterization of the new material GU3TMT.
  • Measurement of NLO response and birefringence at 550 nm.
  • First-principles calculations to analyze electronic structure and NLO properties.

Main Results:

  • GU3TMT exhibits a large NLO response (2.0×KDP) and moderate birefringence (0.067 at 550 nm).
  • First-principles calculations indicate that the π-conjugated (C3N3S3)3- rings are the primary source of the NLO properties.
  • The [C(NH2)3]+ triangles contribute less significantly to the overall NLO response.

Conclusions:

  • GU3TMT is a promising new material for second-order nonlinear optical applications.
  • The study highlights the significant role of π-conjugated rings in determining NLO properties.
  • This research provides insights into the design principles for new NLO crystals.