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Logarithmic and piecewise functions play central roles in mathematical modeling, particularly when capturing nonlinear or segmented behaviors in real-world phenomena. Although these functions differ fundamentally in structure and application, both serve to represent complex relationships in simplified mathematical terms.A logarithmic function is defined as the inverse of an exponential function, expressed as These functions grow quickly for small values of x but slow down as x increases,...
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Transformations modify the graphical representation of a function without changing its fundamental form. One common transformation is reflection, which flips the graph across a designated axis. When the vertical coordinates of all points are multiplied by the negative one, the entire graph is mirrored over the horizontal axis. This transformation reverses the vertical orientation of peaks and troughs, akin to signal inversion in electrical systems, where a waveform is flipped, but the timing of...
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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Visible-Light-Driven Hydrogen Production and Polymerization using Triarylboron-Functionalized Iridium(III) Complexes.

Ling-Xia Yang1,2, Wan-Fa Yang1, Yong-Jun Yuan3

  • 1National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced Microstructures, Jiangsu Provincial Key Laboratory for Nanotechnology, College of Engineering and Applied Sciences, Nanjing University, Nanjing, Jiangsu, 210093, China.

Chemistry, an Asian Journal
|May 4, 2018
PubMed
Summary
This summary is machine-generated.

Novel iridium(III) complexes with tunable photophysical properties were synthesized. These complexes efficiently catalyze hydrogen production from water and facilitate photoinduced polymerization, demonstrating broad photochemical applications.

Keywords:
hydrogeniridiumphotocatalysispolymerizationsensitizers

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Area of Science:

  • Organometallic Chemistry
  • Photochemistry
  • Materials Science

Background:

  • Iridium(III) complexes are crucial in photochemistry due to tunable properties.
  • Developing efficient catalysts for hydrogen production and polymerization is a key research area.

Purpose of the Study:

  • To synthesize and characterize novel dimesitylboron-containing iridium(III) complexes.
  • To evaluate their performance as photosensitizers for water splitting and photocatalysts for polymerization.

Main Methods:

  • Synthesis and full characterization (electrochemical, photophysical, computational) of three heteroleptic iridium(III) complexes.
  • Testing complexes in visible-light-driven hydrogen generation and methyl methacrylate photopolymerization.

Main Results:

  • Tuning N^N ligand conjugation adjusted luminescence from 583 to 631 nm.
  • All complexes showed activity in both hydrogen photogeneration and polymerization.
  • Complex 1 achieved over 1158 turnover numbers for photosensitization, generating hydrogen for 20 hours.
  • Photoinduced polymerization yielded poly(methyl methacrylate) with narrow molecular weight distribution and demonstrated living characteristics.

Conclusions:

  • The synthesized iridium(III) complexes exhibit tunable photophysical properties.
  • They are effective visible-light-driven catalysts for both water splitting and polymerization.
  • These findings highlight their potential for diverse photochemical applications.