m/e 264 £¨M + H£©.

English translation: m/e 264 (M + H)

08:36 Feb 13, 2005

English language (monolingual) [PRO]
Science - Chemistry; Chem Sci/Eng

English term or phrase: m/e 264 £¨M + H£©.

Context: Steps 1 and 2 of PREPARATION 3 are substantially repeated in this preparation except for utilizing the appropriate starting materials to afford the title compound£» m/e 264 £¨M + H£©.

Thank you very much in advance!

Jianming Sun KudoZ activity Questions: 2132 (none open) (13 closed without grading) Answers: 1174
Local time: 22:45

Selected answer:m/e 264 (M + H)

Explanation:
(M+H) should be an ion produced in chemical ionization, a molecule with a hydrogen ion attached:
http://www.asms.org/whatisms/p11.html

264 is its mass-to-charge ratio.

Generally, "m/e 264 (M + H)" should be left unchanged in a translation. It is there to identify a compound by the mass-to-charge ratio of its protonated ion.

I'm no MS specialist, so I don't know why the charge is omitted in the (M+H).

Selected response from:

Jörgen Slet
Estonia
Local time: 17:45

Grading comment

Thank you, Jörgen! And thank you all for contribution!
4 KudoZ points were awarded for this answer

SUMMARY OF ALL EXPLANATIONS PROVIDED

3 +2

m/e 264 (M + H)

Jörgen Slet

m/e 264

David Sirett

comment

Ken Cox

Discussion entries: 8

Answers

3 hrs confidence:

m/e 264 £¨m + h£©. comment

Explanation:
The author must have used symbols that are not present in the character set of the font being used to display (or print) the document, so other characters are being substituted. One can literally only guess what the proper symbols should be.

If you are viewing this as a Word document, you might try looking at 'Font substitution' on the Tools/Options/Compatibility tab card, which will show you which fonts were used to generate the document and which fonts Word is using to display characters for any fonts not present on your system. The default substitution font is Times New Roman, unless some other substitution has been defined, and that can yield strange results if it substitutes for a special font.

Ken Cox
Local time: 16:45
Native speaker of:

English
PRO pts in category: 28

4 hrs confidence:

m/e 264 £¨m + h£©. m/e 264

Explanation:
m/e is the mass-to-charge ratio, a fundamental parameter in mass spectroscopy (see ref.).
Not sure of the other junk.

Reference: http://chipo.chem.uic.edu/web1/ocol/spec/MS1.htm

David Sirett
Local time: 16:45
Specializes in field
Native speaker of:

English
PRO pts in category: 23

7 hrs confidence:

peer agreement (net): +2

m/e 264 (M + H)

Jörgen Slet
Estonia
Local time: 17:45
Specializes in field
Native speaker of:

Estonian
PRO pts in category: 36

Grading comment

Thank you, Jörgen! And thank you all for contribution!

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