Interpretation:
In Figure
Concept introduction:
The signals in an NMR spectrum tend to be better resolved as the magnet of the spectrometer becomes more powerful. This is true primarily because the magnetic fields that cause signal splitting, that is, those produced by the various spin combinations of nearby nuclei, are independent of the
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- An antihistamine shows sharp peaks at Raman shifts of v 488, 725,875, 925, and 1350 cm-1. At what wavelengths in nanometers would the Stokes and anti-Stokes lines for the antihistamine appear if the source were (a) a helium-neon Laser (632.8 nm)? (b) an argon-ion laser (488.0 nm)?arrow_forwardCOSY is one of 2D spectras which are widely used for the structure determination of proteins with a mass of up to 10 kD. What gives rise to cross signals in a COSY experiment?arrow_forwardExplain (with the aid of one or more equations) why a LOWER selectivity coefficient for an interfering ion means an ISE is actually MORE selective for the target ion.arrow_forward
- True or False : The difference in energy, ΔE, between alfa (+1/2) and beta (–1/2) spin states of a proton is independent of the strength of the applied magnetic field. Could you explain detail?arrow_forwardA proton jumps between two sites with δ = 2.7 and δ = 4.8. At what rate of interconversion will the two signals collapse to a single line in a spectrometer operating at 550 MHz?arrow_forwardWhat is the name of the standard that defines zero on the chemical shift axis? (The standard must be a molecule with protons in only one type of environment.) -Tetramethylsilane -Propanoic acid -Ethanol -Butanearrow_forward
- What accelerating voltage would be needed to analyze for C6H6+ (MW = 78.11) using a magnetic sector mass spectrometer, if it required 1144V to detect CO2+ (MW = 44.00)?arrow_forwardDescribe commonly used standards for proton NMR? Please answer at your own easy words. Answer should be to the point.arrow_forwardPredict the multiplet you would expect for coupling to two equivalent spin-1 nuclei.arrow_forward
- Sketch an H1NMR spectrum for isopentyl acetate. Make sure to indicate how the different proton signals are split.arrow_forwardA.) Which parameter between "solvent polarity function" and dielectric constant show better correlation with the peak positions? B.) When a chromophore binds to proteins, the binding site is generally more hydrophobic than the solution. Then, what kind of shift do you expect to observe in the absorption peak position compared to the peak observed when the chromophore is free in solution?arrow_forwardWhat is peak multiplicity and how does multiplicity arise?arrow_forward
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