Fluorescence spectra of alkaline earth derivatives of azo compounds

1962 ◽  
Author(s):  
Rodney Louis Olsen
Keyword(s):  
Alkaline Earth ◽  
Fluorescence Spectra ◽  
Azo Compounds ◽  
Derivatives Of

Bis(trimethylsilyl)methyl Derivatives of Calcium, Strontium and Barium: Potentially Useful Dialkyls of the Heavy Alkaline Earth Elements

2008 ◽  
Vol 14 (36) ◽  
pp. 11292-11295 ◽  
Author(s):  
Mark R. Crimmin ◽  
Anthony G. M. Barrett ◽  
Michael S. Hill ◽  
Dugald J. MacDougall ◽  
Mary F. Mahon ◽  
...  
Keyword(s):  
Alkaline Earth ◽  
Alkaline Earth Elements ◽  
Methyl Derivatives ◽  
Derivatives Of

Alkaline-Earth Derivatives of Diphenylphosphine–Borane

2020 ◽  
Vol 39 (23) ◽  
pp. 4195-4207 ◽  
Author(s):  
Louis J. Morris ◽  
Michael S. Hill ◽  
Mary F. Mahon ◽  
Ian Manners ◽  
Brian O. Patrick
Keyword(s):  
Alkaline Earth ◽  
Derivatives Of

scholarly journals Phosphoreszenzeigensch aften von Methyl-, Chlor- und Brom-Derivaten des [2.2] Paracyclophans

1987 ◽  
Vol 42 (9) ◽  
pp. 1041-1042 ◽  
Author(s):  
H. Hopf ◽  
E. Hermann
Keyword(s):  
Triplet State ◽  
Fluorescence Spectra ◽  
Heavy Atom ◽  
The Other ◽  
Quantum Yields ◽  
Heavy Atom Effect ◽  
Chloro Derivatives ◽  
Derivatives Of ◽  
Atom Effect

Phosphorescence and fluorescence spectra, quantum yields of phosphorescence and fluorescence as well as phosphorescence lifetimes have been measured of six methyl-, chloro- and bromo-derivatives of [2.2] paracyclophane in ethanol at 77 K. While the chloro-derivatives as well as dibromo-paracyclophane exhibit a normal internal heavy-atom effect behaviour the momobromo-compound shows anomalies. These possibly indicate that in the monobromo-compound an additional pathway of the radiationless deactivation of the lowest triplet state is effective which does not occur with the other compounds.

Synthesis and spreading behaviour of some reactive derivatives of long-chain alcohols and carboxylic acids

1984 ◽  
Vol 62 (3) ◽  
pp. 574-579 ◽  
Author(s):  
David A. Holden
Keyword(s):  
Mass Spectrometry ◽  
Fatty Acids ◽  
Surface Activity ◽  
Azo Compounds ◽  
Single Chain ◽  
Bulk Solid ◽  
Potential Applications ◽  
Curing Agents ◽  
Derivatives Of ◽  
Long Chain

Procedures are described for the synthesis of several azides, diimides, and azodiformates from long-chain alcohols and fatty acids. These reactive compounds have potential applications as thermal and photochemical curing agents, and as surface-modifying agents for the preparation of filled plastics and chromatographic packings. The surface activity of the compounds was characterized by investigations of their spreading behaviour in monolayers on water. Unlike the single-chain azides and azo compounds, which give well-defined monolayers at all temperatures, monolayers of diacyl diimides and dialkyl azodiformates with two long-chain substituents are unstable with respect to collapse to the bulk solid. The photoreaction of monolayers of octadecanoyl azide to give a mixture of products derived from an intermediate isocyanate was demonstrated by ir and mass spectrometry.

scholarly journals Molecular cleft or tweezer compounds derived from trioxabicyclo[3.3.1]nonadiene diisocyanate and diacid dichloride

2015 ◽  
Vol 11 ◽  
pp. 1-8 ◽  
Author(s):  
Gert Kollenz ◽  
Ralf Smounig ◽  
Ferdinand Belaj ◽  
David Kvaskoff ◽  
Curt Wentrup
Keyword(s):  
Rare Earth ◽  
Crown Ether ◽  
Dft Calculations ◽  
Metal Ions ◽  
Rare Earth Metal ◽  
Alkaline Earth ◽  
Earth Metal ◽  
X Ray ◽  
X Ray Crystallography ◽  
Derivatives Of

The structures of two derivatives of the bisdioxine diisocyanate 1, the bisurea 4 and the biscarbamate 5, are established by X-ray crystallography and DFT calculations. These compounds possess endo,endo structures, in the case of the bisurea 4 with two nearly parallel pendant chains. The X-ray structures are reproduced very well by DFT calculations. Similar endo,endo conformations are calculated for the bisamide crown ether derivatives 7, where two proximate and nearly parallel crown ether units endow the molecules with a claw-like molecular cleft or tweezer structure as evidenced by an enhanced ability to extract some alkali, alkaline earth and rare earth metal ions.

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