Paramagnetic resonance in phosphorescent aromatic hydrocarbons. I: Naphthalene

Waals, J.H. van der; Groot, M.S. de

doi:10.1080/00268975900100301

Cited by 226 publications

(33 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…After a delayed interval, Hutchison and Mangum in 1958 [59], and van der Waals and de Groot in 1959 [60] succeeded in successfully observing the expected ESR splitting, in oriented molecules in an isomorphic crystal lattice, and in glass solvents, by these researchers respectively. This interval of 12 years added to the delay in the general acceptance of the triplet state assignment.…”

Section: Photophysics Of the Triplet Statementioning

confidence: 99%

From Jabłoński To Femtoseconds. Evolution of Molecular Photophysics

Kasha

1999

Acta Phys. Pol. A

View full text Add to dashboard Cite

A presentation is given, with retrospective commentary, on the experimental and theoretical contributions to key steps in the evolution of the framework of contemporary molecular photophysics from the Jabłoński Diagram to femtosecond range excitation phenomena. The distinctive features of polyatomic molecules separating their behavior from atomic and diatomic molecules are emphasized. Justification is given for the statement that spin-orbital coupling with its relativistic component commonly domi- nates the molecular excitation dynamics of light-(low-Z)-atom molecules.The paper deals with single-photon, single-molecule excitations. Some examples of single-photon, multi-molecule and multi-photon, single-molecule excitation phenomena are listed. A selection of these is made to illustrate the prevalence of femtosecond excitation modes.

show abstract

Section: Photophysics Of the Triplet Statementioning

confidence: 99%

From Jabłoński To Femtoseconds. Evolution of Molecular Photophysics

Kasha

1999

Acta Phys. Pol. A

View full text Add to dashboard Cite

show abstract

“…spectra of orbitally nondegenerate hydrocarbon triplet states can be understood (1,2) on the basis of a Zeeman interaction and a second-order tensor tern1 independent of the field. T h a t is in terms of the spin Hamiltonian T h e zero field splitting tensor G is due primarily (13)(14)(15) …”

Section: Discussionmentioning

confidence: 99%

“…T h e two terms in [6] are recognized (from [2]) as the zero field splitting tensors G(A) arrd G(B) for the component phenyl units.…”

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Spin–spin interactions in polyphenyls

Gardner¹

1967

Can. J. Chem.

View full text Add to dashboard Cite

An attempt has been made, with some success, to interpret the zero field splitting parameters for the triplet states of molecules such as the polyphenyls where the subunits are weakly coupled and the molecules are probably nonplanar. The method used was a semi-empirical exciton theory, applied in particular to biphenyl and 1,3,5-triphenylbenzene. I n these two cases it is found that structure information, in particular the angle between rings, obtained by this method is in good agreement with electron diffraction data.Canadian Joutnal of Chemistry. Volume 45, 1707 (1967) The early electron spin resonance (e.s.r.) studies of Hutchison and Mangum (I) and van der IVaals and de Groot (2) have stimulated considerable experimental and theoretical interest in the triplet states of organic molecules. One of the main theoretical concerns has been the correlation of the zero field splitting parameters D and E mith~molecular structure.For the excited triplet states of aromatic molecules such as benzene and naphthalene, as well as various methvlenes and nitrenes which have triplet ground states, the theoretical predictions (3-7) based on molecular orbital descriptions are in good agreement with what is observed experimentally.T h e purpose of the present study is t o investigate the use of an exciton description for the calculation of zero field splitting parameters. This type of model is-widely used in the description of the optical properties of molecular crystals (8, 9). T h e same approach has achieved some success in the description of molecules in which the subunits are weakly coupled, such as linear polyenes (10, 11) and polyphenyls (8, 12).We develop the theory initially to discuss the e.s.r. results of triplet biphenyl and triphenylbenzene. Some discussion of the a~~l i c a t i o n of the model t o molecules such A A as triphenylene is also given.IPresent address: Defence Chemical, Biological and Radiation Laboratories, Ottawa, Canada. DISCUSSIONT h e e.s.r. spectra of orbitally nondegenerate hydrocarbon triplet states can be understood (1,2) on the basis of a Zeeman interaction and a second-order tensor tern1 independent of the field. T h a t is in terms of the spin Hamiltonian T h e zero field splitting tensor G is due primarily (13-15) to the first-order effect of the dipolar spin-spin interaction. In this approximation G is an average over the wave function where and ri, is the vector joining the electrons. (11) BiphenylWe consider biphenyl to consist of two weakly interacting phenyl groups. l4o(A) and 341(A) are the wave functions representing the ground state and first excited triplet state of phenyl group A respectively.T o first order we may then write the ground and lowest triplet molecular wave function as Can. J. Chem. Downloaded from www.nrcresearchpress.com by 54.202.233.140 on 05/11/18For personal use only.

show abstract

“…After the early observation of electron paramagnetic resonance of the triplet states of aromatic molecules by Hutchison, Van der Waals, and their collaborators (15,68), I became interested in the possible rapid propagation of triplet states in organic solids. I referred to these excitations as triplet excitons.…”

Section: Excitation Energy Transfer Ratesmentioning

confidence: 99%

Adventures in Physical Chemistry

McConnell

2010

Annu. Rev. Biophys.

View full text Add to dashboard Cite

My research has included chemical physics, electron and NMR spectroscopy, membrane biophysics, and immunology. This research was curiosity driven as well as problem and technique oriented. A theoretical equation was developed for relating nuclear hyperfine splittings to electron spin distributions in free radicals. Another equation was developed to relate NMR spectra to chemical reaction rates. Early evidence for the liquid-like properties of cell membranes was obtained through the use of paramagnetic probes (spin labels). Spin labels were used in measurements of lateral as well as transverse diffusion of phospholipids in bilayer membranes. Liquid-liquid phase separations were discovered in monolayer membranes containing phospholipids and cholesterol. In the area of immunology, it was shown that antigenic peptides bind to reconstituted class II MHC molecules in membranes and trigger specific T-helper cells.

show abstract

Paramagnetic resonance in phosphorescent aromatic hydrocarbons. I: Naphthalene

Cited by 226 publications

References 6 publications

From Jabłoński To Femtoseconds. Evolution of Molecular Photophysics

From Jabłoński To Femtoseconds. Evolution of Molecular Photophysics

Spin–spin interactions in polyphenyls

Adventures in Physical Chemistry

Contact Info

Product

Resources

About