apparatus for sealing air-sensitive material into an ampoule

Submitted by Cameron Gren / University of North Alabama on Thu, 05/16/2019 - 17:43

I work with air-sensitive organometallic compounds When I was in graduate school, we used to send off samples for x-ray crystallography in ampules that we would seal using a little apparatus. It was essntially a screw cap with a hole and an o-ring that you would put around the ampoule. That would then screw onto (I think) a threaded glass adapter with a ground-glass joint on the other end that you would put a gas inlet onto. All of this could be done in the glove box, then brought out and put on the Schlenk line. I seem to remember pulling a slight vacuum before sealing it.

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Helium Recovery

Submitted by Joseph Keane / Muhlenberg College on Thu, 04/18/2019 - 10:57

Can anyone recommend a compact commercially available helium-recovery system that is appropriate for a single 400 MHz NMR spectrometer?  I strongly suspect this is beyond our budgetary means, but given the direction of things, I feel like I should at least confirm that fact.  Any thought/suggestions welcome.  

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grants office versus consultants

Submitted by Brian Johnson / St. John's University/College of St. Benedict on Mon, 06/25/2018 - 13:00

Our liberal arts college has had a grants office staffed by two part-time people for the past decade plus.  As you would guess, they assisted with proposal writing, budget preparation and proposal submission for external proposals from any department on campus.  For budgetary reasons this office was recently eliminated.  There has been discussion that external consultants would be hired to assist with larger proposals (but we would be on our own for smaller ones).  Does anyone have experience (positive or negative) with using external consultants in this way?

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Elemental analysis vendor

Submitted by Adam Johnson / Harvey Mudd College on Mon, 04/30/2018 - 15:59
Inorganic friends. Who do you use for CHN? My current vendor has gone downhill and I won’t use them again. My invoice on a rushed air sensitive sample was “not forwarded” and it is now a week later and only my follow up email prompted a response. In my more recent interaction with them, I had to email to request my data after it was not sent to me after a month or 6 weeks. Thanks.
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X-ray crystallography

Submitted by Catherine / East Tennessee State University on Fri, 03/09/2018 - 10:05

My reserach group has synthesized some new metal complexes that we'd like to get X-ray structures for, but my department doesn't have the instrumentation for X-ray crystallography.  Is there anyone that would be willing to collaborate, or who know a faciility where I can get the analysis done for a reasonable fee.

 

Thank you

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Database for UV/vis spectra

Submitted by Gerard Rowe / University of South Carolina Aiken on Fri, 01/05/2018 - 14:08

I'm sure everyone here has, at some point, wondered what the UV/vis spectrum of a particular metal salt looks like in a given solvent.  Often, the availble information is limited to a couple of peak wavelengths and molar absorptivities, if you're lucky.  In my classes, I often keep using the same spectra found in Miessler, Tarr, and Fischer, which, themsevles, come from a 1962 book, "Absorption Spectra and Chemical Bonding in Complexes" by Jorgensen.  It's frustrating that there doesn't seem to be an extensive database of electronic spectra (NIST Chemistry Webbook doesn't have much in the w

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100 Papers every chemist should read

Submitted by Kyle Grice / DePaul University on Mon, 01/01/2018 - 17:01

Hi folks. 

On twitter I started asking for submissions for 100 papers every chemist should read. If you have a paper idea, please submit one!

Here: https://docs.google.com/forms/d/e/1FAIpQLSfLv7OLZWbHsBS62IKvANcRhdmiIN1…

We haven't hit 100 papers yet, but here's a rough draft look at the results so far:

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Gas mixing/blending

Submitted by Kyle Grice / DePaul University on Wed, 12/06/2017 - 08:19

Hi All,

I want to mix gases in several ratios for an experiment. In grad school we had a gas mixer to make the 5-10% H2 in N2 regen gas, but I haven't been able to find the model online. 

Does anyone have a gas mixer to measure the flow of two gases, and if so, what's the brand/item info? Any other ideas on how to mix gas flows? This would be with flowing gases, not a static amount of gases. 

Thanks!

Kyle 

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NMR parts

Submitted by Chip Nataro / Lafayette College on Mon, 12/04/2017 - 13:41

We are getting rid of our old JOEL Eclipse 400. It has a multinuclear probe, gradient shimming, temperature controller and auto-sampler. It is essentially good for parts. Is anyone interested? Let me know.

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