The correlation between the chemical shift and dihedral angle has been largely attributed to a γ-substituent effect, the influence of an atom in the gauche position three bonds away, based upon early studies of small molecule C chemical shifts.
We designed and synthesized terminal iodinated nitroxide radical liquid crystalline compounds (NR-LCs) with octyloxy side chain -8-I and dodecyloxy side chain -12-I theundersubstitutionbstitution effects of an iodine atom on the phase transition behavior and on the magnetic properties in crystalline (Cr), liquid crystalline (LC) and isotropic (Iso) phases.
However, the mesomeric effect of halogen atom plays an important role, and electron density increases at π-bond and hence oxidation becomes easy.
In extended X-ray absorption fine structure spectroscopy (EXAFS), interference effects generated by near neighbours of an atom that has absorbed an X-ray, and the resulting oscillation frequencies, are analyzed so that distances to the near-neighbour atoms can be accurately determined.
Thus, delocalization distributes the bonding effect of an electron pair over the atoms of the molecule, and hence one electron pair can contribute to the bonding of more than two atoms.
Effect of alloying atom position and Cr concentrations of Co-Cr-W alloys was studied and explained regarding the electronic structure.
The proper heteroatom bonding configuration and synergistic effect of multiple atom co-doping are very important for improving their catalytic activity.
Unlike previous clusters, effect of Al atom(s) substitution with Si atom(s) on the geometry of Al6 is significant as clearly shown in Fig. 4b.
By using reflectance-difference spectrum and photoreflectance spectrum, we find that the degree of the segregation effect of indium atom and the intensity of the build-in field in the step QWs are comparable to those in symmetric QWs.
Much beyond the magnitude of an atom, as quantum effects faded, objects took on definite positions in space and time.
