Band Spectra of Diatomic Molecules

Gaydon, A. G.

doi:10.1038/173417a0

Cited by 18 publications

(21 citation statements)

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“…There is evidence th a t in ammonia the N H 2-H bond is some 10 or 15 kcal stronger th an the NH -H and N-H bonds (Gaydon 1953;Semenov 1958). I f the same is true in phosphine the reaction 2PH a P H + P H 3 (2) is exothermic, and can be invoked to explain the production of P H from P H 2, whereas its reverse cannot explain the production of P H 2 from PH .…”

Section: Discussionmentioning

confidence: 99%

The flash photolysis of phosphine

Norrish

Oldershaw

1961

Proc. R. Soc. Lond. A

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The equation representing the decomposition of phosphine by flash photolysis is shown to be PH 3 → P red + 3/2H 2 . The phosphorus is produced in the form of small particles which remain suspended in the gas phase for several minutes provided that the total pressure is high enough. The variation with time of the spectra of PH 2 , PH and P 2 has been studied and the secondary reactions consequent upon the photolysis are shown to be homogeneous. The P 2 is produced in a vibrationally excited state at room temperature, transitions involving levels of up to v' = 7 being observed. A mechanism for the photolysis and the production of excited P 2 is proposed.

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Section: Discussionmentioning

confidence: 99%

The flash photolysis of phosphine

Norrish

Oldershaw

1961

Proc. R. Soc. Lond. A

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“…dimethylformamide (DMF) and dimethyl sulfoxide (DMSO)), as revealed by the 1 H NMR spectra of polymer solutions showing no polymeric species but monomers (Figure 3A). This intrigued us since there was no external catalysts added in the system and the scission of linear disulfide bonds (around 60 kcal mol −1 ) [15] undoubtedly requires the acceleration by catalysis at room temperature. Considering the moderate nucleophilicity of acylhydrazine units, we inferred that the sidechain acylhydrazine units may be responsible for the auto‐depolymerization mechanism (Figure 3B).…”

Section: Figurementioning

confidence: 99%

A Chemically Recyclable Crosslinked Polymer Network Enabled by Orthogonal Dynamic Covalent Chemistry

Deng

Zhang

et al. 2022

Angewandte Chemie

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Chemical recycling of synthetic polymers offers a solution for developing sustainable plastics and materials. Here we show that two types of dynamic covalent chemistry can be orthogonalized in a solventfree polymer network and thus enable a chemically recyclable crosslinked material. Using a simple acylhydrazine-based 1,2-dithiolane as the starting material, the disulfide-mediated reversible polymerization and acylhydrazone-based dynamic covalent crosslinking can be combined in a one-pot solvent-free reaction, resulting in mechanically robust, tough, and processable crosslinked materials. The dynamic covalent bonds in both backbones and crosslinkers endow the network with depolymerization capability under mild conditions and, importantly, virgin-quality monomers can be recovered and separated. This proof-of-concept study show opportunities to design chemically recyclable materials based on the dynamic chemistry toolbox.

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“…Oxygen illustrates well the principles set out in 8 11, and has been particularly closely studied. The lowest stable electronic state is 3X; (in the usual notation; see, for example, Gaydon 1953), and transitions to the next three stable states (lAg, 'Xi, and 3Xz) are forbidden. Absorption due to these transitions is very weak (although the extremely thick layer of oxygen separating us from the sun enables two of them to be observed, and Herzberg has observed the third by special means).…”

Section: Absorption By Oxygenmentioning

confidence: 99%

Dynamics of a dissociating gas Part 2. Quasi-equilibrium transfer theory

Lighthill

1960

J. Fluid Mech.

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The introduction to Part 1 (Lighthill 1957) proposed a paper in three parts, in the nature of a broad introductory discussion of the dynamics of a pure dissociating gas, which might act as a source of ideas for later, more comprehensive investigations. Part 1 treated ‘equilibrium flow’, Part 2 was to treat transport properties under ‘quasi-equilibrium’ conditions, and Part 3 flows in which large departures from equilibrium occur. When Part 1 was submitted for publication, much of Part 2 had already been written. At this moment, however, the author suddenly became obliged to abandon the project for two years, in order that his contributions to two collective works, Laminar Boundary Layers and Incompressible Aerodynamics, could be produced in time to avoid serious delay in the appearance of the contributions of other authors.

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Band Spectra of Diatomic Molecules

Cited by 18 publications

References 0 publications

The flash photolysis of phosphine

The flash photolysis of phosphine

A Chemically Recyclable Crosslinked Polymer Network Enabled by Orthogonal Dynamic Covalent Chemistry

Dynamics of a dissociating gas Part 2. Quasi-equilibrium transfer theory

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