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Atomic Nuclei: Nuclear Spin State Population Distribution01:14

Atomic Nuclei: Nuclear Spin State Population Distribution

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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.
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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,...
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NMR Spectroscopy: Spin–Spin Coupling01:08

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The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Two stable phosphorus-containing four-membered ring radical cations with inverse spin density distributions.

Yuanting Su1, Xin Zheng, Xingyong Wang

  • 1State Key Laboratory of Coordination Chemistry, School of Chemistry and Chemical Engineering, Nanjing University , Nanjing 210093, China.

Journal of the American Chemical Society
|April 16, 2014
PubMed
Summary

Two novel phosphorus-containing four-membered ring radical cations were synthesized and studied. Their distinct structural and electronic properties, including inverse spin density distributions, are dictated by exocyclic substituents.

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Area of Science:

  • Inorganic Chemistry
  • Organophosphorus Chemistry
  • Radical Chemistry

Background:

  • Phosphorus-containing four-membered rings are of interest due to their unique reactivity.
  • Radical cations offer distinct electronic and structural properties compared to their neutral counterparts.

Purpose of the Study:

  • To isolate and characterize novel phosphorus-containing four-membered ring radical cations.
  • To investigate the influence of exocyclic substituents on the structure and spin density distribution of these radical cations.

Main Methods:

  • UV-vis absorption spectroscopy
  • Electron Paramagnetic Resonance (EPR) spectroscopy
  • Single-crystal X-ray diffraction
  • Density Functional Theory (DFT) calculations

Main Results:

  • Two radical cations, 1(•+) and 2(•+), were successfully isolated and characterized.
  • Radical 1(•+) exhibited elongated P-P bonds and pyramidalized phosphorus atoms, while 2(•+) showed shortened P-Nring distances.
  • EPR studies revealed an inverse spin density distribution: 1(•+) had spin density on exocyclic nitrogens, whereas 2(•+) had it on endocyclic phosphorus atoms.

Conclusions:

  • The exocyclic substituents play a crucial role in controlling the spin density distribution in these phosphorus-containing radical cations.
  • DFT calculations support the observed inverse spin density distributions, highlighting the substituent effect.