How to determine pka of 1,8-Diazabicyclo[5.4.0]undec-7-ene (DBU) in propionitrile at -40 C?

The pka of DBU in acetonitrile is 24.34. The pKa values are affected by temperature and the solvent dielectric constant. Is there a formula to convert pka values from one solvent to another as...

02 March 2016 7,503 1 View

How to crystallize product that crash out from an aqueous solution?

I run my reaction in water and leave it for slow evaporation. The product crashed out after a week, which are not suitable for X-ray crystallography. I have tried to dilute the product and slowly...

01 February 2016 907 3 View

What solvent and electrolyte combination is suitable for a large potential window with glassy carbon electrode in non-aqueous condition?

01 February 2016 3,639 4 View

Why does the GC electrode get oxidized with 1M NaOH?

I have been trying to get a background CV with 1M NaOH. As soon as I do IR compensation, the program says "Resistance is TOO HIGH". I can see bubbles forming in the GC electrode and auxillary Pt...

07 August 2015 672 9 View

Is there any solvent system where metal triflates precipitate out?

05 June 2015 4,166 3 View

What is the best way to crystallize sodium hydroxide for electrochemical studies?

I have tried to crystallize with sodium hydroxide with ethanol. However, I can still see a peak at 1.3V vs. Ag/AgCl in my CV graph.

05 June 2015 4,474 3 View

I am getting flaky solids after crystallization. What kind of solvent system should I used?

I have been trying to crystallize my metal complex with slow diffusion of diethyl ether in acetonitrile and methanol. However I am getting flaky solids, instead of crystals. Could you share any...

04 May 2015 1,497 5 View

What is the most Operating System (OS) which can be INSTALL on Tiny hard devices like Raspberry Pi (RPi) hardware ?

I'm targeting to deploy a mesh network and manually configure MANET routing protocols. I'm preparing scenarios, architectures, and hard devices needed to do that. Are there some step-by-step...

03 March 2021 1,931 5 View

Can we classify HV and LV lines based on line length?

I have dataset which shows the length of power lines. I need to classify the lines based on the line length. Is there a rule to classify the High voltage (HV) and low voltage (LV) lines based on...

03 March 2021 4,116 4 View

Is there a classification scheme for rock cavities or caverns with respect to their size and shape?

The range of forms and sizes of cavities in rock is very big. Is there a classification scheme for rock cavities regarding their size and shape?

02 March 2021 4,511 3 View

Is there a powerful system for the security of the systems distributed on IoT systems?

Is there a powerful system for the security of the systems distributed on IoT systems?

02 March 2021 3,858 10 View

Which is suitable for use with Python? MySQL or SQL Server?

Which is suitable for use with Python? MySQL or SQL Server? What is your suggestion?

01 March 2021 3,422 3 View

Which fluorescent dye to use for measuring total ROS production?

Is DCFDA appropriate for measuring total ROS production, or can it only detect certain types of ROS? If I want to measure total ROS production, which dye should I use?

01 March 2021 9,447 3 View

How to Eliminate cosine error and abbe error in LASER measurement system(for example Rhenishaw XL80)?

I like to do project in laser measurement system. My objective is to eliminate or reduce the cosine error, abbe error in Laser measurement system. I have Rhenishaw XL80 system. Please tell the...

28 February 2021 4,890 3 View

The reason that the culture of white fungi Contamination with green mold(Trichoderma), the culture autoclave at121 for 15 min. What is it?

Is the period to autoclave not enough? The inoculation in a hood and flame and UV and alcohol.

27 February 2021 9,356 3 View

I need dataset for recommandation system?

Hi every body I need to collect datasets from different source to work on recommendation system algorithms, could you advise me how collect data?

27 February 2021 7,063 7 View

Gas sensor response and recovery time independant of flow rate and chamber volume?

I am trying to obtain the response and recovery times for my gas sensor device. It appears the the response/recovery times are primarily dependant on the flow rate of the gas I inject into the...

26 February 2021 1,511 3 View