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6th May 2012 @ 17:08
Spectroscopic Method: MS-ESI
Substituent: Methoxy
MS Spectrum of (3E)-3-(4-Methoxybenzylidene)-1,3-dihydro-2H-indol-2-one:



The mass spectrum of (3E)-3-(4-Methoxybenzylidene)-1,3-dihydro-2H-indol-2-one has been obtained by positive electrospray ionization (ESI). The peak at m/e = 252.2 confirms the molecular mass of this compound as the molecular ion gains a proton.

Interpretation of MS Spectrum of (3E)-3-(4-Methoxybenzylidene)-1,3-dihydro-2H-indol-2-one:

Peak Position Diff. between molecular mass and peak Suspected molecules or ions Inference
252.2 252 – 251 = 1 (M+H)+ Compound gains a proton.
293.2 293 - 251 = 42 (M+H+Na+H2O)+ Na(23), H2O (18) Sodium & H+ ions and water molecule attach to the compound.
315.2 315-251=64 (M+HCOOH+H2O)+ Molecular ion gains formic acid and water molecule.