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Sibrina Collins, The Charles H. Wright of Museum of African American History
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Cyclic Voltammetry request

Dear VIPEr Colleagues,

Has anyone prepared a powerpoint (5 slides about) focused on the basics of CV? I have never taught this topic, nor did I learn about itin graduate school. If I did, I don't remember. I am thinking about talking about this in my inorganic class. I look forward to hearing from you.

Sibrina

Adam R. Johnson, Harvey Mudd College
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I taught CV directly out of Harris's text when I taught analytical a few years ago.  I just went back and looked at my slides form that day, and they're all directly out of the text, so not sharable.  However, he does a good job explaining electrochemistry to a layperson.  Electrochem is one of my weakest strengths (haha).  Every time I learn part of it, some other part of it leaves;  I don't ever use it so it doesn't stick for more than a few days, and it never really made intuitive sense to me so I don't have a fallback memory aid or anything like that.

hopefully someone else out there has something!

Chip Nataro, Lafayette College
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What is your time frame? I don't have 5 or so slides together on the topic but would likely be able to do so in a relatively short period of time. The issue is that this week is a disaster and I know there is no chance I c ould get it done if you need them quickly.
Sibrina Collins, The Charles H. Wright of Museum of African American History
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Hey Chip,

Thanks so much for your reply. There is no hurry on this. Whenever you can get them to me that would be great. How about the next couple of weeks?

SNC

Sibrina Collins, The Charles H. Wright of Museum of African American History
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Adam,

Electrochemistry is one of my weakest areas too. But, I am thinking of bringing it into my inorganic lab.

SNC

Adam R. Johnson, Harvey Mudd College
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if only there was an inorganic chemistry teaching website where Chip could post his CV slides....... 
Maggie Geselbracht, Reed College
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And voila!  Chip's 5-slides about (well, 13-slides about) Cyclic Voltammetry are now up on VIPEr.  Check them out!  Thanks, Chip
Jared J. Paul, Villanova University
Jared J. Paul, Villanova University's picture
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Sibrina,

 

I introduced cyclic voltammetry into our junior chemistry inorganic lab two years ago and it worked out extremely well.  I can send you the lab write-up if you're interested.  It's a three week lab.  The first week students synthesize Ru(bpy)32+.  The second week they use the complex to study absorbance, emission and quenching.  The third week is cyclic voltammetry.  The students seem to enjoy this lab a lot, especially because we talk a lot about energy, most notably solar during these weeks.  In addition, we do many subtle changes, such as swapping out the counter ion to change solubilities of the complex.  I don't know how to submit a lab through VIPEr, but I'd be happy to send you a copy!  I'd love to know what people think and if they have any suggestions to make it better!

 

Jared

jared.paul@villanova.edu 

 

 

Adam R. Johnson, Harvey Mudd College
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Jared,

We have a lab experiment section on VIPEr and I would love to see you submit it here!  Please contact me or any of the Leadership Council (our contact info is on the left side-bar at the top) if you want assistance submitting.

Adam 

Amanda Reig, Ursinus College
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Jared - I would also love to see your lab protocol.  Your experiment sounds similar to the one I just did over the first two weeks of the semester, but the CV portion did not go so well for us.  I'm not sure if it was our set-up or the instructions I used so it would be great to see what works for you.
Sibrina Collins, The Charles H. Wright of Museum of African American History
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Jared,

I sent you an email, so I am interested in seeing the experiment. I think it could be a fun lab.

Sibrina Collins, College of Wooster

Jared J. Paul, Villanova University
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Adam - I went ahead and uploaded the file (as well as trying to fill in all the information I could)!  I hope this suffices and will be more than willing to make changes to the document as people have suggestions.  I really do think this is a fun lab, and I also think that there is plenty of room for improvement!  I love to hear what everyone thinks!  And tell Scott Williams I said "Hello!" 

Jared 

Nancy Scott Burke Williams, Scripps College, Pitzer College, Claremont McKenna College
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Um, Hi, Jared...
Kyle Grice, DePaul University
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The more I do CV, the more I appreciate it as a great tool (I didn't do it at all in grad school).  The lab I am in now uses it regularly to analyze compounds and to study electocatalysis.  Its also great to couple it with spectroscopy and do spectroelectrochemistry (SEC).  I really think SEC should be more widely used.  I might write up a few slides on CV/SEC for analysis of redox chemistry and catalysis.  Although, my understanding of electrochemistry is still developing.

Dr. Kyle Grice Post-Doc UCSD Kubiak Lab

Scott Cummings, Dominican University
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Greetings VIPEreans,

Can anyone suggest an inorganic system (preferably a transition metal complex or coordination compound) that afford a reversible CV in aqueous solution? Here's the catch, OTHER THAN ferricyanide? (and, yes, other than ferrocyanide, too!)

Ru(bpy)32+ and related complexes work well in acetonitrile, and several organic system offer reversible reductions in water, but I'm searching for a simple, commercially-available metal complex that give a good "duck" in water.

Any and all advice is appreciated.

I hope new school years are off to a great start!

Cheers,

Scott Cummings

Kyle Grice, DePaul University
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Hi Scott,

Ru(bpy) is soluble in water, so you could use that. The corresponding cobalt complexes are water soluble too and pretty reversible (in the absence of reactive species: http://pubs.acs.org/doi/pdf/10.1021/ed100652s).

Cheers,

Kyle

Robert LeSuer, The College at Brockport, SUNY
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Another standard water-soluble system is ferrocenemethanol.  Hexammineruthenium also works very nicely if you keep air out of the solution.  (Simply due to overlapping redox potentials with oxygen; the compound itself seems to be fairly stable in water.)