Quenching of Chemical Oscillations with Light

“…Recently, Sørensen and co-workers published a new pulse sequence called INADEQUATE CR (composite refocusing) 43,44 which enhances the sensitivity of INADQUATE by concentrating the two signals of a doublet to just one signal (to either the left or the right signal). The first part of the pulse sequence (Scheme 7) is identical with 2D-INADEQUATE, producing echos and antiechos.…”

Section: Sensitivity Enhancement By Composite Refocusingmentioning

confidence: 99%

Connectivities in molecules by INADEQUATE: recent developments

Buddrus

Lambert

2001

Magnetic Reson in Chemistry

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The INADEQUATE (Incredible Natural Abundance DoublE QUAntum Transfer Experiment) consists of a pulse sequence which eliminates the NMR signals from isolated spins (spin system A) displaying signals from coupled spins (spin system AX or higher spin systems). It is of great importance when applied to molecules with skeleton elements such as carbon, silicon or tungsten, all of which contain a small percentage of spin-1 2 isotopes embedded in magnetically inactive isotopes. Analysis of the AX type spectra gives one-bond and long-range coupling constants (see compound 6) and, most important, the connectivity pattern of the skeleton atoms in molecules of unknown structure such as the carbon compounds 1 or 2, the silicon compound 3 or the lithium compound 4b. Unfortunately, INADEQUATE is rather insensitive, in the case of carbon only one out of 10 4 molecules gives the desired response. Efforts to reduce this drawback are described; recently, a remarkable step forward has been made by concentrating the four lines of an AX spin system to just two signals (see Fig. 2).

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“…Spiral waves in a chemical system were first observed in the BZ reaction 2. In the past three decades, the BZ reaction has become one of the most widely investigated model systems for studying wave patterns because of its inexpensive compounds, easy preparation process, and easy detectability of wave patterns by applying different catalysts such as ferroin, light‐sensitive Ru(bpy)

_{2+}^{3}

, or Fe[batho(SO 3 ) 2 ]

^{4^{−} /3^{−}}

16–21. Müller et al studied the effect of short light impulses on meandering spiral wave in the BZ reaction with Ru(bpy) 2+ 3 as catalyst and malonic acid as organic substrate 22.…”

Section: Introductionmentioning

confidence: 99%

Chemical wave studies in the bromate–pyrocatechol beads system

Harati

Izadyar

2011

Int J of Chemical Kinetics

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We studied the chemical wave activity of the pyrocatechol-acidic bromate system in the presence of ferroin-loaded beads. The wave activity lasted for more than 24 h while meandering spirals continued for up to 10 h. Rigid and meandering spiral waves were investigated. We have analyzed the wave propagation speed and spiral tip trajectory versus the initial concentrations of all reagents as well as the age of the solution. Wave velocity depends on [H + ] and [BrO 3 ] 1/2 , which is in agreement with other studies. This system is ideal to study wave activity and spiral waves as it does not produce precipitates under the studied conditions. C

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Quenching of Chemical Oscillations with Light

Cited by 27 publications

References 20 publications

Backfiring and nonannihilation collisions in the Belousov–Zhabotinsky medium

Backfiring and nonannihilation collisions in the Belousov–Zhabotinsky medium

Connectivities in molecules by INADEQUATE: recent developments

Chemical wave studies in the bromate–pyrocatechol beads system

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