Heavy-atom tunneling as the dominant pathway in a solution-phase reaction? Bond shift in antiaromatic annulenes

1983 ◽  
Vol 105 (6) ◽  
pp. 1700-1701 ◽  
Author(s):  
Barry K. Carpenter
Keyword(s):  
Heavy Atom ◽  
Solution Phase ◽  
Phase Reaction

Synthesis of titanium boride (TiB)2 nanocrystallites by solution-phase processing

1995 ◽  
Vol 10 (10) ◽  
pp. 2599-2612 ◽  
Author(s):  
Susan E. Bates ◽  
William E. Buhro ◽  
Claire A. Frey ◽  
Shankar M.L. Sastry ◽  
K.F. Kelton
Keyword(s):  
Annealing Temperature ◽  
Titanium Boride ◽  
Processing Parameters ◽  
Precursor Powder ◽  
Initial Solution ◽  
Solution Phase ◽  
Phase Reaction ◽  
Amorphous Precursor ◽  
Size Dependent ◽  
Crystallite Sizes

Nanocrystalline TiB2 is prepared by reaction of NaBH4 and TiCl4. The initial solution-phase reaction affords an amorphous precursor powder from which 5-100 nm TiB2 crystallites are obtained upon annealing at 900-1100 °C. Crystallite sizes depend on the annealing temperature and other processing parameters. Crystallite morphology is size dependent; crystallites smaller than 12-15 nm are cuboidal, whereas crystallites larger than 12-15 nm are hexagonal platelets. The procedure affords gram quantities of the smallest available TiB2 nanocrystallites.

scholarly journals Photodegradation of Riboflavin under Alkaline Conditions: What can Gas-Phase Photolysis Tell Us About What Happens in Solution?

2021 ◽  
Author(s):  
Natalie G.K. Wong ◽  
Chris Rhodes ◽  
Caroline E.H. Dessent
Keyword(s):  
Mass Spectrometry ◽  
Gas Phase ◽  
Direct Method ◽  
Photochemical Reactions ◽  
Solution Phase ◽  
Ionization Mass ◽  
Phase Reaction ◽  
Esi Ms ◽  
Alkaline Conditions ◽  
On Line

The application of electrospray ionization mass spectrometry (ESI-MS) as a direct method for detecting reactive intermediates is a technique of developing importance in the routine monitoring of solution-phase reaction pathways. Here, we utilize a novel on-line photolysis ESI-MS approach to detect the photoproducts of riboflavin in aqueous solution under mildly alkaline conditions. Riboflavin is a constituent of many food products, so its breakdown processes are of wide interest. Our on-line photolysis setup allows for solution-phase photolysis to occur within a syringe using UVA LEDs, immediately prior to being introduced into the mass spectrometer via ESI. Gas-phase photofragmentation studies via laser-interfaced mass spectrometry of deprotonated riboflavin, [RFH], the dominant solution-phase species under the conditions of our study, are presented alongside the solution-phase photolysis. The results obtained illustrate the extent to which gas-phase photolysis methods can inform our understanding of the corresponding solution-phase photochemistry. We determine that the solution-phase photofragmentation observed for [RFH] closely mirrors the gas-phase photochemistry, with the m/z 241 ion being the only major condensed-phase photoproduct. Further gas-phase photoproducts are observed at m/z 255, 212, and 145. The value of exploring both the gas- and solution-phase photochemistry to characterize photochemical reactions is discussed.

On-line chiral analysis using the kinetic method

The Analyst ◽  
2016 ◽  
Vol 141 (8) ◽  
pp. 2441-2446 ◽  
Author(s):  
Ryan M. Bain ◽  
Xin Yan ◽  
Shannon A. Raab ◽  
Stephen T. Ayrton ◽  
Tawnya G. Flick ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Tandem Mass Spectrometry ◽  
Kinetic Method ◽  
Enantiomeric Excess ◽  
Solution Phase ◽  
Chiral Analysis ◽  
Tandem Mass ◽  
Phase Reaction ◽  
On Line

Chiral analysis of constituents in solution-phase reaction mixtures can be performed by tandem mass spectrometry using the kinetic method to determine the enantiomeric excess (ee).

ChemInform Abstract: Chemical Aspects of Solution Phase Reaction Dynamics

ChemInform ◽  
2010 ◽  
Vol 26 (52) ◽  
pp. no-no
Author(s):  
D. RAFTERY ◽  
R. J. SENSION ◽  
R. M. HOCHSTRASSER
Keyword(s):  
Reaction Dynamics ◽  
Solution Phase ◽  
Phase Reaction

Chemical Aspects of Solution Phase Reaction Dynamics

1993 ◽  
pp. 163-205 ◽  
Author(s):  
D. Raftery ◽  
R. J. Sension ◽  
R. M. Hochstrasser
Keyword(s):  
Reaction Dynamics ◽  
Solution Phase ◽  
Phase Reaction

Hexagonal nanoplatelets of CuSe synthesized through facile solution phase reaction

2011 ◽  
Vol 46 (3) ◽  
pp. 340-344 ◽  
Author(s):  
T.P. Vinod ◽  
Xing Jin ◽  
Jinkwon Kim
Keyword(s):  
Solution Phase ◽  
Phase Reaction
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