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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

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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.
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

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When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
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Isomerism02:43

Isomerism

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Isomers are molecules with the same molecular formula but different structural arrangements. Isomers can be further classified into constitutional isomers and stereoisomers. Constitutional isomers differ in the connectivity of their constituent atoms. For example, 2-butanol and diethyl ether are constitutional isomers, as they have the same chemical formula, C4H10O, but differ in the connectivity of the carbon and oxygen atoms. Constitutional isomers have different physical and chemical...
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Mass Analyzers: Common Types01:19

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The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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¹H NMR: Pople Notation01:09

¹H NMR: Pople Notation

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The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
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Sequence-specific Labeling of Nucleic Acids and Proteins with Methyltransferases and Cofactor Analogues
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On Counting Metamers.

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    Metameric objects match color under specific lighting. However, changing illumination can cause these objects to appear different, leading to color mismatches. This study analyzes these color matching variations.

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    Area of Science:

    • Color science
    • Visual perception
    • Photometry

    Background:

    • Metamerism describes objects with identical color appearance under specific lighting conditions.
    • Color perception is dependent on the spectral power distribution of the illuminant and the spectral sensitivities of the photoreceptors.
    • Understanding metamerism is crucial for accurate color reproduction and management.

    Purpose of the Study:

    • To evaluate the probability density distribution of mutually metameric objects.
    • To analyze how metamerism changes under different illuminations, leading to potential color mismatches.
    • To investigate the mathematical basis of the metamer mismatch volume.

    Main Methods:

    • Assessing objects as equiprobable reflecting surfaces.
    • Calculating the probability density distribution for classes of metameric objects.
    • Deriving the probability density distribution within the metamer mismatch volume.
    • Expressing the center of the mismatch volume as a function of spectral properties.

    Main Results:

    • The probability density distribution of metameric object classes was evaluated.
    • Objects metameric under one illumination may not be under another, creating a metamer mismatch volume.
    • The center of this mismatch volume is mathematically linked to illuminant and photoreceptor spectral characteristics.

    Conclusions:

    • Illumination is a critical factor in metamerism and can induce color mismatches.
    • The metamer mismatch volume provides a framework for quantifying color differences under varying light.
    • The findings have potential applications in advanced color management systems.