15N enriched secondary amines from enriched ammonium chloride
T2 relaxation of protons are reproducible but fluctuating at different temperatures.
10 November 2013 2,907 2 View
Hydroxyl groups have pKa 13.6(saliclyic acid) and above 15(mandelic acid,not sure). What reagent can be used in a simple laboratory for the above purpose?
01 February 2013 635 6 View
Metal Chlorides undergo hydrolysis in water. So we add acid to prevent that. Now if we add the ligands and if the solubility product is low, we may end up with the precipitate. But do we need to...
09 October 2012 1,147 13 View
According to the literature, (Applied spectrosopy, Volume 47, Number 6, 1993), I should have got an absorption maxima at 240nm.. 1 had taken 1:1 ratio of citric acid and lanthanum chloride but my...
09 October 2012 5,102 1 View
In the presence of excess of dialkyl amine, can I expect an equilibrium between the ammonium chloride (alkylated) and corresponding amine? How do I separate the expected dialkyl amine?
09 October 2012 691 2 View
Ammonium chloride can be alkylated quite easily. But how can we convert them to corresponding amines?
08 September 2012 9,254 1 View
or Hydrophobic chelating ligands
08 September 2012 451 0 View
How to prepare the stock solutions of exact concentrations of metal ions with the following composition XCl3. nH2O? Is it right if I consider the molecular weight of anhydrous salt for all my...
08 September 2012 6,285 13 View
Ln=La,Lu,Y in particular.
07 August 2012 4,086 2 View
Approximate concentrations are require in compared with the WHO permissible limts
11 August 2024 2,723 1 View
Hey there, As a synthetic chemist delving into theoretical calculations for my imidazolium-based organic molecules, I would greatly appreciate any guidance on the appropriate input instructions...
09 August 2024 5,444 7 View
I'm currently working on calculating the collision cross section (CCS) for various ions, and I'm facing challenges when dealing with sodiated and multiply charged ions. Most of the resources I’ve...
08 August 2024 8,329 0 View
Hello What should be done to separate and identify organic acids in HPC when their RetTime is the same?Like oxalic acid with Propanoic Acid.or acids that have a very close RetTime.
07 August 2024 8,782 3 View
I used humic acid at 0.044 g/kg soil in my pot experiment. But finally, I have to recommend kg/ha. Each pot's soil weight was 11 kg. What is the solution?
02 August 2024 7,186 6 View
Hi everyone, I'd like to better separate two close peaks coming from a bioconversion sample, I'm currently using a C18 KromaPhase 4,6mm Ø.I. SCHARLAU, particle size (µm): 10, pore size (Å): 100,...
30 July 2024 435 3 View
I am currently working on a project involving liposomes and need to determine the maximum volume of siRNA that can be added to a 2.5 mL liposome solution with a total lipid concentration of 10...
30 July 2024 6,420 1 View
Dear Siesta Users, I installed Siesta 5.0.1 and I want to use Grimme's D3 correction. According to the 5.0.1 manual, I could use a few parameters to include the D3 correction in the...
27 July 2024 5,748 0 View
It has been long known that EDC carbodiimide and NHS easter's half life agains hydrolysis are highly related to pH. However, very surprisingly, not yet found a paper giving a table/chart of their...
25 July 2024 8,738 0 View
I run mechanochemical reactions that involves the use of a large amount of catalyst (1:1 molar ratio to the reactant). When I try to understand the effect of amount of catalyst on the reaction, I...
23 July 2024 9,938 1 View
