McConnell expression

The McConnell expression (Eq. 5) also explains the relative insensitivity of / to the type of ET or HT process and to variation in redox properties of the chromo-phores. The distance dependence, / , of the electronic coupling is, within the weak coupling approximation implied by Eq. 5, governed by the ratio A/r in Eq. 6. The sensitivity of / to variation in the magnitude of A is given by Eq. 24 ... 

The pseudo-contact shifts recordedfor the 1 1 adduct of [M(dpm)3] (M = Eu, Pr, or Yb) with o-phenanthroline or 2,2 -bipyridyl were not in accord with the Robertson-McConnell expression, which assumed axial symmetry about the metal Lewis-base bond. The spectra of the phen complexes were relatively insensitive to variations in temperature, whereas the temperature variations of the spectrum of [M(dpm)3(bipy)] could be explained by biphenyl-type rotational isomerism of unidentate bipy. Further co-ordination by substrates added to [M(dpm)3(phen)] and its bipy analogues was not observed. In addition to 1 1 and 1 2 adducts, the system [M(fod)3]- 7t-C5H5)Fe(CO)2-CN] (M = Pr, Eu, Ho, or Yb) also contained 1 3 adducts. However, the relative successive formation constants for the 1 2 adducts decreased in the order Pr > Eu > Ho > Yb, indicating greater steric crowding with the heavier metal complexes. 

McConnell, G. (2004). Confocal laser scanning fluorescence microscopy with a visible continuum source. Opt. Express 12, 2844—50. 

Mace K, Gonzalez FJ, McConnell IR, Gamer RC, Avanti O, Harris CC, Pfeifer AM (1994) Activation of promutagens in a human bronchial epithelial cell line stably expressing human cytochrome P450 1A2. Mol Carcinog ll(2) 65-73. 

A great deal of the electron resonance work has been done with aromatic radical ions, produced by adding or removing a tt electron from the neutral molecule by the action of a reducing or oxidizing agent.14 Correlation of data for many systems with molecular orbital calculations of v electron distributions has led to a quantitative expression, the McConnell relation (Equation 9.4), which... 

Francis F, Koulakoff A, Boucher D, Chafey P, Schaar B, Vinet MC, Friocourt G, McDonnell N, Reiner O, Kahn A, McConnell SK, Berwald-Netter Y, Denoulet P, Chelly J (1999) Dou-blecortin is a developmentally regulated, microtubule-associated protein expressed in migrating and differentiating neurons. Neuron 23 247-256... 

Bajjalieh SM, Frantz GD, Weimann JM, McConnell SK, Scheller RH (1994) Differential expression of synaptic vesicle protein 2 (SV2) isoforms. J Neurosci 14 5223-5235. 

An expression for / for long-range dipole-dipole repulsions can be obtained using an equation proposed by McConnell.1153 Considering a hexagonal array of circular islands of radius R, one obtains... 

It is immediately apparent from equation (9) that the McConnell model predicts an exponential decay of the magnitude of Ve with increasing number of bridge bonds. From equations (6) and (9) - using n, the number of bonds, in place of the distance r, in the former equation - the damping factor /3el may be expressed in terms of A and t according to equation (10) ... 

I express sincere appreciation to my editorial assistants, Eileen McConnell and Jean Pazur, for invaluable help in the preparation of the manuscript to former collaborators, Judy Kane and Walter Karakawa, for sharing significant experimental data and to Margery Worrick for technical assistance with the figures. 

Leith C, Kopecky K, Chen I, Eijdems L, Slovak M, McConnell T, Head D, Weick J, Grever M, Appelbaum F, Wilhnan C. Frequency and clinical significance of the expression of the multidrug resistance proteins MDRl/P-glycoprotein, MRPl, and LRP in acute myeloid leukemia a Southwest Oncology Group Smdy. Blood 1999 94 1086-1099. 

Gray D, McConnell I, Kumararatne DS, MacLennan IC, Humphrey IH, Bazin H Marginal zone B cells express CR1 and CR2 receptors. Eur I Immunol 1984 14 47—52. 

The McConnell equation (Equation 1.18) expresses the relationship of the observed coupling constant (an) to the unpaired spin population on the adjacent carbon atom (pc) The constant Q is different from one situation to another, but when an electron in a pz orbital on a trigonal carbon atom couples to an adjacent hydrogen, it is about -24 G. Applied to aromatic hydrocarbons, where it is particularly easy to generate radical cations and anions, there proves to be a good correlation between coupling constants and the calculated coefficients in the HOMO and LUMO, respectively.62... 

Luz and Meiboom (1963) use the equations of McConnell (1958) to solve the Carr-Purcell sequence in the presence of exchange. Certain serious approximations are required in the solution but a simple expression in closed form is derived for the fast-exchange limit. This... 

The hyperfine structure of the ESR spectrum is used to identify trapped radicals. This is due to the interaction of unpaired electrons with magnetic moments of the nuclei surrounding unpaired electrons localized at the radical site. Hyperfine interaction is described by two terms. One is the isotropic interaction, a, originating from the contact interaction of the wave functions of electron- and nuclear spins, and the other is the anisotropic interaction, D, originating from the magnetic dipole-dipole interaction. The total hyperfine interaction, a -f D, is therefore essentially anisotropic and can also be expressed in the form of a tensor A. As in the case of g-tensor, A can be described by three principal values. A, Aj, and A3, corresponding to the principal axes in a proper molecular coordinate system. The magnitude of the isotropic term of hyperfine interaction depends on an overlap of the wave packets of the unpaired electrons and nuclei in the case of the hyperfine interaction of an unpaired electron with a P-proton (see Fig. 2.2), McConnell s relation [Eq. (2.3)] has been derived... 

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