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Intermolecular interactions between halo-substituted p-benzoquinones (BQ) and halide anions were examined in solution, solid-state and/or in silico. While X-ray crystallography revealed only halogen bonding (XB) between tetraiodo-p-benzoquinone (I Q) and halides, the results of a UV-Vis study in solutions were consistent with the formation of 1 : 1 anion-π complexes. DFT computations showed that the anion-π complexes of halides with most halo-substituted BQ molecules were more stable (by 2-7 kcal/mol) than their XB analogues, but the stabilities of different complexes of I Q were essentially the same. Thus, the structural features of the co-crystals with I Q were related to multicenter XB interactions between BQs and halides, thus leading to the formation of 3D networks. The observation of anion-π complexes in solutions was attributed to their higher molar absorptivity (by more than an order of magnitude) than that of their XB analogues. Overall, the stabilities of anion-π and XB complexes between BQs and halides were well correlated with the values of highest electrostatic potentials on the surfaces of BQ molecules when their polarizations were taken into account.
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Layered hybrid metal-halide perovskites with non-centrosymmetric crystal structure are predicted to show spin-selective band splitting from Rashba effects. Thus, fabrication of metal-halide perovskite...
We report photodetachment spectroscopy and high-resolution photoelectron imaging of para-halogen substituted phenoxide anions, p-XC6H4O- (X = F, Cl, Br, I). The dipole moments of the corresponding neu...
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Halides are negatively charged ions of halogens, forming fluoride (F-), chloride (Cl-), bromide (Br-) and iodide (I-). These anions are quite reactive and interact both specifically and non-specifical...
X-ray structures of the halo-substituted complexes [Fe III (5-X-salMeen) 2 ]ClO 4 (X = F, Cl, Br, I) at RT have revealed the presence of two discrete HS complex cations in the crystallographic asymmet...
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The purpose of this study is to detect potential herb-drug interactions in volunteers.
Methanes substituted with three halogen atoms, which may be the same or different.
Benzene rings which contain two ketone moieties in any position. They can be substituted in any position except at the ketone groups.
Screening techniques first developed in yeast to identify genes encoding interacting proteins. Variations are used to evaluate interplay between proteins and other molecules. Two-hybrid techniques refer to analysis for protein-protein interactions, one-hybrid for DNA-protein interactions, three-hybrid interactions for RNA-protein interactions or ligand-based interactions. Reverse n-hybrid techniques refer to analysis for mutations or other small molecules that dissociate known interactions.
The interactions of particles responsible for their scattering and transformations (decays and reactions). Because of interactions, an isolated particle may decay into other particles. Two particles passing near each other may transform, perhaps into the same particles but with changed momenta (elastic scattering) or into other particles (inelastic scattering). Interactions fall into three groups: strong, electromagnetic, and weak. (From McGraw-Hill Encyclopedia of Science & Technology, 7th ed)
Derivatives of hydroquinone (1,4-dihydrobenzene) made by reduction of BENZOQUINONES.
Radiology is the branch of medicine that studies imaging of the body; X-ray (basic, angiography, barium swallows), ultrasound, MRI, CT and PET. These imaging techniques can be used to diagnose, but also to treat a range of conditions, by allowing visuali...