Groups Containing NO Bonds, or Si, P, S, or Halogen Atoms

2004 ◽  
pp. 217-246 ◽  
Author(s):  
Robert W. Hannah
Keyword(s):  
Halogen Atoms

Inductive effect in EI-mass spectra of some 5,6-dihalogenides and 5,6-halohydrins of 5α-cholestan-3β-ol and 3β-acetoxy-5α-cholestane

1982 ◽  
Vol 47 (11) ◽  
pp. 2946-2960 ◽  
Author(s):  
Antonín Trka ◽  
Alexander Kasal
Keyword(s):  
Mass Spectra ◽  
Inductive Effect ◽  
Molecular Ions ◽  
Hydroxyl Group ◽  
Halogen Atoms ◽  
Derivatives Of

Partial EI-mass spectra of 3β-hydroxy- and 3β-acetoxy-5α-cholestanes substituted in positions 5α-, 6β- or 5α,6β- with a hydroxyl group or halogen atoms (fluorine, chlorine, bromine) are presented. The molecular ions of 5α,6β-disubstituted derivatives of 3β-hydroxy-5α-cholestane (or of its 3-acetate) are considerably more stable than the corresponding monosubstituted derivatives if at least one of the pair of the vicinal substituents is chlorine or fluorine. This increase in stability, most striking in 5α- and 6β-fluoro compounds, is explained by the inductive effect.

Silver(i) coordination polymers based on halogenated cyanoformamidine: roles of oxyanions and halogen atoms in the structural diversity

CrystEngComm ◽  
2021 ◽  
Vol 23 (9) ◽  
pp. 1961-1968
Author(s):  
Fu-Hung Cheng ◽  
Yu-Hsiang Liu ◽  
Wei-Te Lee ◽  
Ji-Hong Hu ◽  
Hui-Ling Hu ◽  
...  
Keyword(s):  
Coordination Polymers ◽  
Structural Diversity ◽  
Halogen Atoms

Halogen substituents on cyanoformamidine ligands and oxyanions affect the structures of complexes due to differences in their electronegativity and volume.

scholarly journals Physicochemical properties and structural dynamics of organic–inorganic hybrid [NH3(CH2)3NH3]ZnX4 (X = Cl and Br) crystals

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ae Ran Lim ◽  
Sun Ha Kim ◽  
Yong Lak Joo
Keyword(s):  
Structural Dynamics ◽  
Chemical Shifts ◽  
Lattice Relaxation ◽  
Magic Angle Spinning ◽  
Spin Lattice Relaxation ◽  
Resonance Spectroscopy ◽  
Magic Angle ◽  
Scanning Calorimetry ◽  
Inorganic Hybrid ◽  
Halogen Atoms

AbstractThe physical properties of the organic–inorganic hybrid crystals having the formula [NH3(CH2)3NH3]ZnX4 (X = Cl, Br) were investigated. The phase transition temperatures (TC; 268K for Cl and 272K for Br) of the two crystals bearing different halogen atoms in their skeletons were determined through differential scanning calorimetry. The thermodynamic properties of the two crystals were investigated through thermogravimetric analysis. The structural dynamics, particularly the role of the [NH3(CH2)3NH3] cation, were probed through 1H and 13C magic-angle spinning nuclear magnetic resonance spectroscopy as a function of temperature. The 1H and 13C NMR chemical shifts did not show any changes near TC. In addition, the 1H spin–lattice relaxation time (T1ρ) varied with temperature, whereas the 13C T1ρ values remained nearly constant at different temperatures. The T1ρ values of the atoms in [NH3(CH2)3NH3]ZnCl4 were higher than those in [NH3(CH2)3NH3]ZnBr4. The observed differences in the structural dynamics obtained from the chemical shifts and T1ρ values of the two compounds can be attributed to the differences in the bond lengths and halogen atoms. These findings can provide important insights or potential applications of these crystals.

Pure room temperature phosphorescence emission of organic host-guest doped system with quantum efficiency of 64%

2021 ◽  
Author(s):  
Xiaoqing Liu ◽  
Wenbo Dai ◽  
Qian Junjie ◽  
Yunxiang Lei ◽  
Miaochang Liu ◽  
...  
Keyword(s):  
Quantum Efficiency ◽  
Room Temperature ◽  
Room Temperature Phosphorescence ◽  
Halogen Atoms ◽  
System P ◽  
Phosphorescence Emission

A new doped system with pure phosphorescent emission is constructed using four 1-(4-(diphenylamino)phenyl)-2-phenylethan-1-one derivatives containing halogen atoms as the guests and benzophenone as the host. That is, the doped system...

The Recombination of Halogen Atoms

1962 ◽  
Vol 84 (21) ◽  
pp. 4066-4070 ◽  
Author(s):  
Margaret I. Christie
Keyword(s):  
Halogen Atoms

Displacement of Nuclear Halogen Atoms in Hindered Aryl Ketones by the Action of Grignard Reagents

1954 ◽  
Vol 76 (20) ◽  
pp. 5119-5121
Author(s):  
Reynold C. Fuson ◽  
William S. Friedlander ◽  
George W. Parshall
Keyword(s):  
Grignard Reagents ◽  
Halogen Atoms ◽  
Aryl Ketones

Weakly Coordinating Nature of a Carborane Cage Bearing Different Halogen Atoms. Synthesis and Structural Characterization of Icosahedral Mixed Halocarborane Anions, 1-H-CB11Y5X6-(X, Y = Cl, Br, I)

2000 ◽  
Vol 39 (25) ◽  
pp. 5851-5858 ◽  
Author(s):  
Chi-Wing Tsang ◽  
Qingchuan Yang ◽  
Eric Tung-Po Sze ◽  
Thomas C. W. Mak ◽  
Dominic T. W. Chan ◽  
...  
Keyword(s):  
Structural Characterization ◽  
Halogen Atoms ◽  
Weakly Coordinating

The kinetic theory of hot reactions. Reactions of ions and excited species

1976 ◽  
Vol 29 (3) ◽  
pp. 681
Author(s):  
FCR Cattell
Keyword(s):  
Kinetic Theory ◽  
High Energy ◽  
Excited Atoms ◽  
Halogen Atoms ◽  
Excited Species ◽  
Sufficient Proof

Removal of a product in a manner which conforms to the Estrup-Wolfgang kinetic theory is not sufficient proof that kinetic excitation alone is involved. There may therefore be a need to reappraise some high-energy reactions of heavy halogen atoms where reactions of charged and excited atoms are likely to interfere.

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