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...

03 April 2019 1,301 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...

02 March 2019 7,331 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...

31 December 2018 5,424 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

10 November 2018 7,952 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...

10 November 2018 1,227 2 View

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

02 March 2018 2,999 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...

02 March 2018 8,399 1 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...

11 December 2017 5,709 4 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...

11 December 2017 5,117 6 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

11 December 2017 5,957 12 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

Chlorinated organic formation in odor control scrubbers using hypochlorite?

I'm involved in a study of odor control technologies for municipal wastewater treatment plant. One of the control options involves a chemical 2-stage (acid/alkaline) packed bed scrubber. The...

03 March 2021 3,661 2 View

How the parameters (such as Mw, Chemical bonds, polymer bland and so on) affect the mechanic property of polymer (such as storage, loss modulus) ?

Anyone can recommend any books on such topics? Thanks in advance.

02 March 2021 8,457 2 View