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Energy-Activated Metal Sequestration Using Intramolecularly Sensitized Precipitations

This study presents an energy-activated precipitation process for removing metal impurities. Synthesis and spectral analysis of compounds and complexes are detailed, showcasing their behavior under irradiation. Isomerization rates and photostationary state ratios are also investigated to understand the photoisomerization process. The photochemical production of photostationary state concentrations is explored, providing insights into the complex transformations during irradiation.

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Energy-Activated Metal Sequestration Using Intramolecularly Sensitized Precipitations

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  1. Intramolecularly Sensitized Precipitons: A Model System for Application to Metal Sequestration

  2. Scheme 1. An Energy-Activated Precipitation Process To Remove Metal Impurities

  3. Scheme 2. Synthesis of Compound 1 E

  4. Scheme 3. Synthesis of Ruthenium Complex 2 Z

  5. Scheme 4. Synthesis of Ruthenium Complex 2E

  6. Figure 1. Room-temperature absorption spectra recorded for degassed 10μM acetonitrile solutions of 1Z, 1E (performed in CH2Cl2), 2Z, 2E, and Ru(bpy)3 2+.

  7. Figure 2. Room-temperature emission spectra recorded for degassed 10 μM acetonitrile solutions of complexes 2Z, 2E, and Ru(bpy)3Cl2.

  8. Figure 3. UV-vis spectral changes observed with complex 1E upon irradiation at μg 400 nm at 0, 50, 100, 210, 300, 410, and 565 min (a-g, respectively) in 10 μM 70:30 THF:CH3CN.

  9. Figure 4. UV-vis spectral changes observed with complex 2Z (8.2 μM in degassed acetonitrile) upon irradiation at μg 400 nm at 0, 20, 40, 60, 80, and 100 min (a-f, respectively).

  10. Figure 5. UV-vis spectral changes observed with complex 2E (7.4 μM in degassed acetonitrile) upon irradiation at μg 400 nm at 0, 20, 40, 60, 80, and 100 min (a-f, respectively).

  11. Table 2. Isomerization Rate Constants and Photostationary StateRatios for the Photoisomerization Process of 1 Z/ Eand 2 Z/ Eupon Irradiation at μg 400 nm

  12. Figure 7. Photochemical production of photostationary state concentrations upon irradiation at μg 400 nm of 2Z f 2E and 2E f 2Z. (Top) [2E] vs time. (Bottom) [2Z] vs time. a[Z] vs time starting with 8.2 íM 2Z. b[E] vs time starting with 7.2 μM 2E.

  13. Figure 6. Photochemical production of photostationary state concentrations upon irradiation at μg 400 nm of 1Z/E starting from pure 1Z.

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