2.5 Mass Spectrometry
43
2.5 Mass Spectrometry
43
Mass Ion
Product ion
(and neutral
particle lost)
Substructure or compound type
52
C 4 H 4
+·
53
C 4 H 5
+
54
C 4 H 6
+· ,
C 2 H 4 CN +
[M-54] +· (C 4 H 6 )
(C 2 H 4 CN)
cyclohexenes
cyanoethyl
55
C 4 H 7
+ ,
C 3 H 3 O +
[M-55] +
(C 4 H 7 ) nonspecific; abundant: alicyclics,
butyl esters, N-butylamides
56
C 4 H 8
+· ,
C 3 H 4 O +·
[M-56] +· (C 4 H 8 )
(C 3 H 4 O)
butyl esters, N-butylamides, pentyl
ketones, cyclohexenes, tetralins,
pentylaromatics
methylcyclohexenones, β‑tetralones
57
C 4 H 9
+ ,
C 3 H 5 O + ,
C 3 H 2 F +
[M-57] +
(C 4 H 9 )
(C 3 H 5 O)
nonspecific
ethyl ketones
58
C 3 H 8 N + ,
C 3 H 6 O +·
[M-58] +· (C 4 H 10 )
(C 3 H 6 O)
alkanes
N indicator
α‑methylalkanals, methyl ketones,
isopropylidene glycols O indicator
59
C 3 H 7 O + ,
C 2 H 5 NO +·
[M-59] + (C 3 H 7 O)
(C 2 H 3 O 2 )
(C 3 H 9 N)
propyl esters, propyl ethers
methyl esters
O indicator
amines, amides
60
C 2 H 4 O 2
+· ,
CH 2 NO 2
+ ,
C 2 H 6 NO + ,
C 2 H 4 S +·
[M-60] +· (C 3 H 8 O)
(C 2 H 4 O 2 )
(CH 3 OH + CO)
(C 2 H 4 S)
propyl esters, propyl ethers
acetates
methyl esters
O indicator
61
C 2 H 5 O 2
+ ,
C 2 H 5 S +
[M-61] + (C 2 H 5 O 2 )
(C 2 H 5 S)
glycols, ethylene ketals
2 × O indicator
ethyl sulfides (with 34 S isotope
signal)
S indicator
62
C 2 H 6 O 2
+· ,
C 2 H 3 Cl +·
C 2 H 6 S +·
[M-62] +· (C 2 H 6 O 2 )
(C 2 H 6 S)
methoxymethyl ethers, ethylene
glycols, ethylene ketals
ethyl sulfides (with 34 S isotope
signal)
63
C 5 H 3
+ ,
C 2 H 4 Cl + ,
COCl +
[M-63] + (C 2 H 4 Cl)
(CO + Cl)
chloroethyl
carboxylic acid chlorides (with 37 Cl
isotope signal)
64
C 5 H 4
+· ,
SO 2
+· , S 2
+·
[M-64] +·
(SO 2 )
(S 2 )
sulfones, sulfonates
disulfides (with 34 S isotope signal)