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The Phosphorus Cycle01:21

The Phosphorus Cycle

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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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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Updated: Jun 28, 2025

An Optimized Single-Molecule Pull-Down Assay for Quantification of Protein Phosphorylation
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An Optimized Single-Molecule Pull-Down Assay for Quantification of Protein Phosphorylation

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Trapping an Elusive Phosphanyl-Phosphaalumene.

Lilian S Szych1, Lars Denker1, Joey Feld1

  • 1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, OX1 3TA, Oxford, U.K.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|April 12, 2024
PubMed
Summary

Researchers explored the synthesis of a novel aluminum-phosphorus double bond compound. The transient species readily undergoes C-H activation but can be trapped with a Lewis base for further reactions.

Keywords:
activation chemistryaluminummultiple bondsphosphaalumenephosphorus

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Area of Science:

  • Organometallic Chemistry
  • Main Group Chemistry
  • Low-Coordinate Phosphorus and Aluminum

Background:

  • The synthesis of compounds featuring multiple bonds between heavier main group elements remains a significant challenge.
  • Aluminum-phosphorus multiple bonds are particularly elusive due to the differing electronic properties of aluminum and phosphorus.

Purpose of the Study:

  • To synthesize and characterize a compound containing an aluminum-phosphorus (Al=P) double bond.
  • To investigate the reactivity of this transient Al=P species with small molecules and Lewis bases.

Main Methods:

  • Reaction of an aluminum precursor (Al(Nacnac)) with a phosphorus-containing reagent ([H2CN(Dipp)]2P(PCO)).
  • Low-temperature spectroscopic studies (-70 °C) to characterize transient intermediates.
  • Trapping experiments with Lewis bases (e.g., tetrahydrofuran) and reactions with small molecules (H2, CO2, etc.).

Main Results:

  • Formation of a transient phosphanyl-phosphaalumene intermediate at low temperatures.
  • Intramolecular C-H activation of the β-diketiminato ligand upon warming.
  • Demonstrated reactivity of the transient species as a frustrated Lewis pair and in hydroelementation reactions.
  • Isolation of a stable adduct by trapping with tetrahydrofuran.

Conclusions:

  • The Al=P double bond is highly reactive and prone to intramolecular C-H activation.
  • The transient Al=P species exhibits versatile reactivity, acting as both a Lewis acid/base pair and undergoing addition reactions.
  • Lewis base adducts provide a stable platform for studying the chemistry of these elusive Al=P compounds.