geminal


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geminal

(ˈdʒɛmɪnəl)
adj
1. of, relating to or having a pair (of elements)
2. (Chemistry) chem (of an atom) having two functioning groups
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References in periodicals archive ?
The IR spectrum gave absorption bands of hydroxyl, olefinic and geminal dimethyl moieties at 3410, 1655 and 1322 cm-1, respectively, in the molecule.
Standard geminal methods are inappropriate for actinide chemistry, however, and must be extended to include (i) computationally efficient ways to account for relativistic effects, (ii) correlations between electrons beyond electron-pairing effects (weak correlation), (iii) electronically excited states, and (iv) the description of unpaired electrons.
As mentioned before, the extension with sulfate gives in general rise to a downfield shift of the geminal and vicinal proton signals.
58 (multiplet), indicating geminal olefinic hydrogens.
8,921,299 B2; The Procter & Gamble Company has patented a detergent composition comprising tiron (1,2-dihydroxybenzene-3,5-disulfonic acid, or mono- or di-sulfonate salts of the acid); a ligand capable of chelating to Fe3+, wherein the ligand has a binding constant for Fe3+ that is greater than 1018 M-1, and wherein the ligand is selected from the group consisting of aminocarboxylates containing at least two N atoms, amino-phosphonates containing at least two N atoms, and geminal bisphosphonates; an iron-displacing species selected from the group consisting of phenyl boronic acid, A13+' and mixtures thereof; and at least about 0.
GEMINAL DIFLUORINATION OF THE PYRAZOLE RING OF 3,5-DIPHENYL-PYRAZOLE USING AN N-F REAGENT"*, Allyson L.
As silica contains a large number of silanol groups on its surface in the form of vicinal, geminal, and isolated, it can be considered a very polar filler.
4]) ppm, which are usually assigned to geminal silanol groups, free silanol groups, and siloxane bonds without hydroxyl groups, respectively (28), (29).
One likely explanation is that the NR impurities block reactive silanol groups of the silica (isolated and geminal ones) via hydrogen bonding and hinder a coupling of the silane.
2,2-dinitropropanol involves two steps: (1) electrochemical oxidative nitration (addition of a geminal NO2 group); and, (2) condensation with formaldehyde.
2] protons of the pyrazoline ring resonated as a pair of doublet of doublets (Ha and Hb) due to geminal and vicinal coupling.