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- with amine concentration as shown below. A time-resolved laser spectroscopy experiment had also shown that the half-life of the phosphorescence in the absence of quencher is 29 us. What is the value of k,? [Q/(mmol dm) 1.0 5.0 10.0 I/(arbitrary units) 0.41 0.25 0.16 P17G.4 When benzophenone is exposed to ultraviolet radiation it is excited into a singlet state. This singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experiment in the solvent methanol, the phosphorescence intensity variedMolecular 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)?When benzophenone is illuminated with ultraviolet radiation it is excited into a singlet state. Th is singlet changes rapidly into a triplet, which phosphoresces. Triethylamine acts as a quencher for the triplet. In an experi ment in methanol as solvent, the phosphorescence intensity varied with amine concentration as shown below. A timeresolved laser spectroscopy experiment had also shown that the half-life of the fluorescence in the absence of quencher is 29μs. What is the value of the quenching rate constant kO ?
- The fluorescence of fluorescein is quenched by the iodide (I") ion. The fluorescence (F) intensities for fluorescein as a function of the iodide ion concentration in solution are shown in the table. Prepare a Stern-Volmer plot to determine the Stern-Volmer quenching ] (M) F 272.6 0.000 constant, Ksy. 135.3 0.0050 HO 89.12 0.010 70.14 0.015 54.36 0.020 44.14 0.025 .COOH 39.18 0.030 30.25 0.040 Fluorescein 24.27 0.050 20.95 0.060 Ksy =Draw the structure of the missing reactant, reagent or product required to complete the following transformations. 4. А. 1. Hg(COOCF3)2, CH3CH2OH 2. NaBH4, H30 В. 1. KCN, DMF Br 2. `MgBr 3. Но, heat С. + (Ph)3P-CH-CH3 THE D. 1. Оз, -78 0C 2. Zn, ACOH E. EtMgBr, ether H30 F. 1. Br2, H20 2. NaOH, DMF G. HO CH3 1) CH3 COOH 2) 5 CS Scanned with CamScannerWhy can UV or higher energy radiation not be used for non-destructive spectroscopy of polymer structure ? Why is resolution limited by wavelength?
- For a molecule, the phosphorescence lifetime without quenching is 1.0 s while with a quencher population of 10-2 M the phosphorescence lifetime is 0.10 s. Calculate the rate constant for phosphorescence assuming that kisc >> (kF + kec + kic). Calculate the rate constant for external conversion of the triplet state (kec’), the quenching rate constant for the triplet state (kq’), and the Stern-Volmer quenching constant. Assume that intersystem crossing from T1 to So is negligible.Carbon monoxide [CO] exhibits an IR absorption at 2143cm-1, acetone [CH3C(O)CH3],exhibits an IR absorption for the CO vibration at 1715 cm-1 and ethanol [CH3CH2OH] exhibits an IR absorption for CO at ~1150 cm-1. Draw Lewis structures of these three molecules and use your structures to explain the observed differences in the CO IR absorption peak frequency (nCO).Which of the following(s) is/ are false ? I- Nonradiative relaxation takes place during collisions between excited molecules and molecules of the solvent. Il- A monochromator enables the spectral isolation of a wavelength from the beam of a light source. III- Vibrational relaxation is the transition between the lower vibrational levels of an excited electronic state and the higher vibrational levels of lower electronic state. Select one: O a. I and ll O b. Il and II O c. only II O d. I and ll O e. l, Il and III O f. only I| O g. only I
- 5. For each of the following pairs of transitions, state which you would expect to be more intense, and why? "A2 → E or "A2 → 'E in Cr(C2O4); 'Ag "T2g in NICI,“ or 'T → *T2 in NİCL? I. П. III. 'Aig → 'T2g in Co(NH3),** or 'A, → 'E in [Co(en);]3+Why is there a need to specify regioselectivity and stereospecificity when dealing with products after a reaction mechanism? Choose one molecule and one type of reaction to substantiate your answer.Will quantitative fluorescence spectroscopy be as sensitive to path length differences in sample cells as quantitative UV-visible spectroscopy? Explain. What are some of the potential pitfalls of parts per billion analysis?