Recent content by amattiol

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    1H-NMR for conformation elucidation

    Hello, I have having some difficulty determining the conformer and assigning H-NMR peaks for a compound with a N,N-diisopropylacetamidine (R-NH-C(CH3)N(2[CH[2(CH3)]])... essentially a diisopropylamine added to CH3CN (ACN). my H-NMR spectrum (at room temp) in CD3CN consists of: I have assigned...
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    Quantum yield: fluorescence spectrum correction

    Hello, I hope all is well, I have a few questions regarding fluorescence spectral corrections. I have run into an issue with corrections on the instrument I'm using. I have obtained spectra for a few compounds where the correction was working properly and achieve the results as expected. When...
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    Quantum Yield Determination

    Hello, I have been measuring quantum yields in the lab for quite some time and have occasionally been running into some difficulty with my fluorescence spectra. The intensity (CPS) of the spectra for the same molecule will remain the same under the same conditions most of the time; then, every...
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    Post your spring schedule here!

    Not to bad for my last semester: Inorganic Chemistry Physical Chemistry I Organic Chemistry Research Seminar djh101, Pchem lab is awful, especially the Quantum Mech. labs as they are mostly theoretical.
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    Computation of 2nd and 3rd Virial Coefficients

    epenguin, I fit 7 terms because it was such a good fit I couldn't resist keeping it fit to the 8th coefficient. If I reduce the fit eqn to z = 1 + B/Vbar + C/(Vbar^2) then B and C would be the 2nd and 3rd coefficients correct? Then I use those to calculate Z? Thanks for the response...I realize...
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    Cyclic rule (thermodynamics)

    I think it has to do with 2nd derivatives... in continuation from where i left of last time: (∂P/∂Vbar)T = -RT/Vbar2 (∂2P/∂Vbar2)T = 2RT/Vbar3 (∂P/∂T)Vbar = R/Vbar (∂2P/∂T2)Vbar = O ((∂/∂T)(∂P/∂T)T)Vbar = -R/Vbar2 ((∂/∂Vbar)(∂P/∂T)Vbar)T = -R/Vbar2 Since those last 2 mixed...
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    Cyclic rule (thermodynamics)

    Total differential -> dP = (∂P/∂T)n,VdT + (∂P/∂V)n,TdV + (∂P/∂n)T,Vdn What if P is Constant? 0 = (∂P/∂T)VbardT + (∂P/∂Vbar)TdVbar so... (∂P/∂T)VbardT = - (∂P/∂Vbar)PdVbar (∂P/∂T)P = - (∂P/∂T)vbar / (∂P/∂Vbar)T With a constraint of P being constant Cyclic Rule Im pretty sure...
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    Computation of 2nd and 3rd Virial Coefficients

    Homework Statement Compute the 2nd and 3rd Virial coefficients at 300K of Ar. Experimental parameters are mentioned in xlist and ylist below :) Homework Equations My professor has given a hit, which is as follows: "Use the data to determine the (z) compressability (sp?) and plot Z as a...
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