Shu Er Tan

11 Questions 5 Answers 0 Followers

Questions related from Shu Er Tan

How to remove the KOH from ethanolic etherification without using extraction method?

Etherification was carried out between aromatic -OH group and alkyl chloride in the presence of ethanolic KOH. The precursor is a bulky dye compound that consists of an aromatic -OH group and an...

24 May 2019 7,905 5 View

Is it possible for a polymer to have optical band gap of 1.3 V and electrochemical band gap of 1.7 V?

Based on the reviews I read, most polymers got close value for optical and electrochemical band gap. I tried to calculate these band gap from UV-vis spectra and cyclic voltammetry. But the band...

02 January 2018 9,658 2 View

Can I use cellulose Soxhlet thimble instead of glass fibre thimble for the Soxhlet extraction in polymerization?

I read that most previous studies used glass fibre thimble instead of the cellulose thimble. The solvents are methanol, acetone, hexane, toluene, dichloromethane, chloroform. If I use cellulose...

16 May 2017 469 2 View

Why the entire FTIR spectrum shifted to the left after dimerization?

2,5-dibromonitrobenzene (monomer) 4,4’-dibromo-2,2’-dinitrobiphenyl (dimer) The FTIR spectra for these two are basically the same. But the dimer spectrum shifted to the left. Isn't that when the...

19 February 2017 1,212 3 View

How can I get freshly powdered KOH from commercially bought KOH pallets?

The KOH absorb atmospheric moisture quite fast when I manually powdered it.

07 February 2017 927 3 View

Which is the suitable NMR solvent for compound that does not dissolve in DMSO-d6 and CDCl3?

I would like to scan NMR for a compound name : 4,4'-dibromo-2,2'-diaminobiphenyl. According to some papers, the NMR solvents used are either CDCl3 or DMSO-d6. However, when I try to dissolve my...

08 January 2017 3,294 9 View

What is the purpose of adding HBr in bromination? Hbr/Br2 system.

Is the HBr was added to prevent the formation of HBr as by-product from Br2 during the reaction (minimize the wastage of Br2)? And to move the reaction forwards faster?

04 December 2016 3,405 8 View

Why DMSO is used even though the compounds are soluble in DMF?

I get to know that the solvent DMF is technically similar to the DMSO for organic synthesis, just that DMSO can dissolve more compounds than the DMF. Is there any special reason that DMSO is used...

20 November 2016 1,171 6 View

Can the commercial reusable dry ice packs be used as dry ice in my experiment?

I have a few packs of reusable dry ice-gel packs. They are sent along with the chemicals in a box for keeping the chemicals cold. Is it possible for me to use that "gel" as dry ice to reach the...

28 October 2016 9,961 4 View

What is exactly means for dry DMSO?

If I have a DMSO in 98% with

26 August 2016 9,098 4 View

Will the oxygen (keto group) on isoindigo react with other monomers during polymerization?

If the group is non-reactive, why?

14 March 2016 5,309 3 View