What rule would you expect for the m/z values of fragment ions resulting from the cleavage of one bond in a compound with an odd number of nitrogen atoms?
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What rule would you expect for the m/z values of fragment ions resulting from the cleavage of one bond in a compound with an odd number of nitrogen atoms?
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- Because of the sensitivity of mass spectrometry, it is often used to detect the presence of drugs in blood, urine, or other biological fluids. Tetrahydrocannabinol (nominal mass 314), a component of marijuana, exhibits two strong fragment ions at mlz 246 and 231 (the base peak). What is the likely structure of each ion? HO, CH3 H H,C H,C CH, TetrahydrocannabinolThe mass spectrum of benzocaine is given below. Draw the structures of the fragment ions that give arise to the peaks at m/z= 165, 137, 120, and 92. 70eV Electron kanization Mass Spectrum Aonarce H2N benzocaine14:27 Done и 5 A strange sample is analysed and found to be C8H12N2O3. Calculate the percentage of each element in this molecule. N n 4G •
- 4. Why does a carbon to oxygen double bond absorption band have a greater intensity than a carbon to carbon double bond absorption band?What is not true about mass spectrometry? Only the molecular ion and cationic fragments are deflected, and they are then separated by their mass-to-charge ratio (m/z) In a mass spectrometer, a compound is first vaporized and then bombarded with electromagnetic radiation which generates a radical cation that is symbolized by (M) + A molecular ion is often very unstable and susceptible to fragmentation In a mass spectrometer, a compound is converted into ions, which are then separated by a magnetic field. It is used to determine the molecular weight and molecular formula of a compound.What is the molecular mass observed for Man9(GlcNAc)2 if it has a mass spectrometry ionization that imparts a +3 charge state? .
- Can IR spectroscopy be used for quantitative analysis? >No, because IR spectroscopy only records vibrational frequency of bonds. >No, because IR spectroscopy only identifies the types of covalent bonds. >Yes, because the transmittance of the analyte is proportional to concentration. >Yes, because the absorbance of the analyte is proportional to concentration.Given that Kb for (CH3)3N is 6.3 × 10-5 at 25 °C, what is the value of Ka for (CH3)3NH at 25 °C?Analyze the mass spect (including fragmentations) for the molecular structure of vanillin (C8H8O3). M=152
- The IR frequency of C≡N¯ in fac-[IrCl3(C≡N)3] is 2200 cm-1. Estimate the IR frequency of C≡N¯ for fac-[IrF3(C≡N)3] with an explanation.Write the resonance forms, if resonance effect is present, of the molecules below and report, the form (s) that present the most important statistical weight: N2 CO2H `NH2Molecular Recognition (Supramolecular Chemistry) in organic chemistry deals with the "lock and key " mechanisms that form new molecules. However, little is known of this subject when moleules go beyond 1500 daltons (g/mole) for example macromolecules of polyolefins (polyethylene, polypropylene), thermoplastic polyesters and polyamides (nylon). It is understood that pre-directional H bonding is the mechanism of molecular recognition of macromolecules. Question: What is the immediate and post manifestation of inducing molecular recognition to condensation polymers and ring opening polymerization polymers like thermoplastic polyesters (PET ), and Nylon 66, 6 etc. (polyamides)?