Iryna Protsak

12 Questions 24 Answers 0 Followers

Questions related from Iryna Protsak

Does the peak intensity in Proton NMR signify a compound amount?

Dear All, I am currently working with NMR spectra and could not understand fully if a compound amount strongly influence the peak intensity in Proton NMR. Also, has an influence the solvent...

04 April 2019 1,368 6 View

Does anyone knows if Trispentafluoroborane air sensitive? I mean to what extent it is air sensitive? Very sensitive or mildly sensitive?

Dear All, I know that Trispentafluoroborane is air sensitive but need to know how much it is sensitive. When I run reactions with this catalyst do i need to pay very carefully attention for...

03 March 2019 7,548 6 View

What if polymerization degree of depolymerizied siloxane appeared to be higher then of unreacted siloxane ?

Dear All, I study depolymerization of siloxane polymer by Proton NMR. The manufacture value of degree of polymerization of pure siloxane polymer was reported as ~ 80. I did depolymerization of...

01 January 2019 5,495 6 View

How I should dispose properly a triethylamine (TEA)?

Dear All, Could anyone suggest a proper disposal procedure of triethylamine. Can I dispose a TEA in non-chlorinated organic solvent waste?? Many thanks, Iryna

11 November 2018 8,068 6 View

How I should dispose properly a porphirine ?

Dear All, I need to dispose the porphirine which stacked on walls of the flasks which were used to run reactions. I washed those flasks with acetone and poured this solution of acetone+residues...

11 November 2018 1,309 2 View

Porphyrine Zn, What is appropriate storage conditions for this reagent?

Hi All, Does anyone familiar of appropriate storage conditions of this compmound? The safety data, attached to the reagent, only mentioned about cool and well ventilated dark place, nothing...

10 October 2018 4,126 0 View

How to prepare sample (liquid) for NMR C13 and H1?

Dear All, I need to run NMR H1 and NMR C13 for neat silicone polymer (polydimethylsiloxane, short name PDMS-100). How I need to prepare the sample for NMR analysis. Do I need to dissolve the...

03 March 2018 8,514 1 View

Heating of the organic solvents, the experimental features..?

I am studying the chemical interaction of hexamethyldisiloxane (HMDS) with dimethyl carbonate (DMC); both are liquids with low flash point (1 °C, for HMDS and 18 °C, for DMC) and boiling...

03 March 2018 3,093 0 View

Hi everyone, What kind of chromatography is better to use SEC or HPLC to analyse polymers with molecular weight of about 6000Da?

Chromatography, SEC or HPLC

12 December 2017 6,017 12 View

The Raman stretching vibration around 514 and 913 cm-1 corresponding to what?

I did Raman spectrum of dimethyl carbonate ( (H3CO)2C=O ) and got two peaks at 514 and 913 cm-1. The molecule of dimethylcarbonate contains C=O group, CH3 group, OCH3 group and these groups have...

12 December 2017 5,827 4 View

How to recalculate molecular weight into concentration for polymers?

I did the depolymerization of polymer, so I got the value of Mw and viscosity which decreases with time. To calculate the rate constant of the depolymerization reaction of polymer I need to...

12 December 2017 4,210 7 View

Which detector is needed to investigate the Mw of polydimethylsiloxane polymer by SEC?

I need to determine the Mw of polydimethylsiloxane polymer by SEC. I determined the Mw of polyphenylsiloxane by SEC as phenyl groups absorb in UV-spectrum. For methyl groups other detector is...

12 December 2017 5,170 6 View