Stubbornly Committed to PBG

So, I finally had my Photobase Generator, but lots of questions.

First, why did it seem to release acid upon irradiation? Upon reviewing the paper in which this molecule was synthesized, I discovered that they had published no actual pH data, only that the product had decomposed upon irradiation into two products, one of which was cyclohexylamine, the basic compound. Because cyclohexylamine was released, it had been classified as a photobase generating solution, which made sense. However, 6-nitrocoumarin was another product, and I couldn’t find any record of it’s acidic properties. My assumption was that perhaps the nitrocoumarin was actually more acidic than the cylclohexylamine was basic. Perhaps that would account for the drop of pH. However, quick tests proved that the nitrocoumarin was relatively basic, so that couldn’t be the solution.

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The Synthesis Dilemma

I apologize for not posting as much as I probably should, but up to this point, despite a large number of trials and theories, very little overall progress has been made, due to a number of extenuating conditions. Let’s talk.

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Nano-Sized, Fluorescence-Driven pH Probes and Modifiers

Hello hello!

My name is Aaron Bayles, and I’m a sophomore at the College, currently studying abroad in Sevilla, Spain. Before I left for the semester, I was working in Dr. Harbron’s chemistry lab, investigating a particular set of fluorescent polymer nanoparticles that can both provide information about the acidity of a solution via the fluorescence of the molecules, as well as modify the pH through exposure to UV radiation. And I’ll be coming back to continue this research this summer!

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Abstract: Hydrogen Generation via Transition Metal complexes

Artificial Photosynthesis is a promising mechanism through which clean, renewable energy can be generated.  Photosynthesis allows a plant to synthesize glucose to use as fuel.  Instead of generating glucose as a final product, artificial photosynthesis generates hydrogen. The mechanism involves a chromophore, a semiconductor, and an electrocatalyst (Fig. 1).  When sunlight hits a chromophore, an electron becomes excited.  This electron is then transferred to a semiconductor, which then transfers the electron to an electrocatalyst.  The electrocatalyst reduces the protons naturally found in water to generate hydrogen gas.   Over the summer, I will be researching a cobalt complex that will act as an electrocatalyst.  Cobalt is earth abundant and has low cost, which will ultimately lower the cost of this mechanism.  The cobalt complex itself is inspired by a similar iron complex previously synthesized in my research lab.  Specifically, I will be running organic syntheses in order to create the ligand so that I may later complex it with cobalt.  This will then yield the electrocatalyst.  Once synthesized, I will then analyze it  using electrochemical experiments to observe its stability and efficiency.  Hydrogen can be introduced into a fuel cell to generate energy, releasing water vapor as waste.  Making this process cost effective and efficient may eventually turn it into a promising alternative energy source.

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At the End of the Summer

And here it is. The moment we have all been traveling towards: the end of summer research! I am actually rather sad that the summer is pretty much over already. It has been a festive summer with some great results!

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