Structure Data of Free Polyatomic Molecules 
Subvolume B: Molecules containing One or Two Carbon Atoms 
Molecules containing One Carbon Atom Element System C -Ag- 
No  Hill Formula  Structure Formula  Name  
001  CAgBrO  BrAgC=O  Bromocarbonylsilver  
002  CAgClO  ClAgC=O  Carbonylchlorosilver  
003  CAgFO  FAgC=O  Carbonylfluorosilver  

Element System C -Al- 
No Hill Formula Structure Formula Name 
004 CAlN AlN=C Aluminum isocyanide 
Element System C -Ar- 
No  Hill Formula  Structure Formula  Name  
005  CArNeO2  CO2  Ar  Ne  Carbon dioxide  argon  neon (1/1/1)  
006  CArO2  CO2  Ar  Carbon dioxide  argon (1/1)  
007  CAr2O2  CO2  2Ar  Carbon dioxide  argon (1/2)  

Element System C -Au- 
No  Hill Formula  Structure Formula  Name  
008  CAuBrO  BrAuC=O  Bromo(carbonyl)gold  
009  CAuClO  ClAuC=O  Cabonylchlorogold  
010  CAuFO  FAuC=O  Carbonylfluorogold  

No Hill Formula Structure Formula Name 
011 CB4F6O F B 

F Carbonyltris(difluoroboryl)boron 
F 


B
BCO 
F 


F
B 


F 
Element System C -Br- 
No Hill Formula Structure Formula Name 
012 CBrCuO 013 CBrF3 014 CBrNO 015 CBr2O 016 CBr12Ge4 BrCuC=O CBrF3BrC=NO CO  Br2 

Br 
BrBr Br BrGe GeBr 
BrGe GeBr Br BrBr Br 
Bromo(carbonyl)copper  Bromotrifluoromethane Bromine fulminate Carbon monoxide  dibromine (1/1) Methanetetrayltetrakis[tribromogermane] 

Element System C -Cl - 
No Hill Formula Structure Formula Name 
017 CClCuO ClCuC=O 
018 CClFO 

O Cl F 
019 CClFO CO  ClF 020 CClFO2 CO2  ClF 021 CClF2N F 


N F 
Cl 
022 CClF2NO F 

Cl O 
FN 
Carbonylchlorocopper Carbonyl chloride fluoride 
Carbon monoxide  chlorine fluoride (1/1) Carbon dioxide  chlorine fluoride (1/1) N-Chlorodifluoromethanimine 
Chlorodifluoronitrosomethane 

023 CClIO CO  ICl Carbon monoxide  iodine chloride (1/1) 
No  Hill Formula  Structure Formula  Name  
024  CClNO  ClC=NO  Chlorine fulminate  
025  CCl2  ..  Dichloromethylene  
C  
Cl  Cl  


N
026 CCl2F3NS Cl 


F [(Trifluoromethyl)imido]sulfurous dichloride 
S 


F 
Cl F 
027 CCl3NO2 
Trichloronitromethane 
Cl NO2 


Element System C -Cu- 
No  Hill Formula  Structure Formula  Name  
028  CCuFO  FCuC=O  Carbonylfluorocopper  
029  CCuN  CuC=N  Copper monocyanide  

Element System C -F - 
No Hill Formula Structure Formula Name 
030 CFNOS O	Sulfinyl cyanide fluoride 


031 CFNO3S OO 



O Sulfuryl fluoride isocyanate S 


C 
F N 


032 CFNO5 

O Fluorocarbonyl nitro peroxide O 
F O 


NO2 


033 CF2	.. Difluoromethylene C 
F 


F 
034 CF2I2 CF2I2 Difluorodiiodomethane 035 CF2N2S F Sulfur cyanamide difluoride 
N 


S

C 
F N 


036 CF2O2 	O 
F 3,3-Difluorodioxirane O 
F 037 CF2Se Se Selenocarbonyl fluoride 
038 CF3NOS 

O	F cis-Fluoroformyliminosulfur difluoride  S 
F N 



F 039 CF3NOS2 F F (Z)-1,1,1-Trifluoro-N-sulfinylmethanesulfenamide 

F
O






S 

N
040 CF3NOS3 	F 

(Z)-Sulfinylamino trifluoromethyl disulfide 
S 


S 
F 
FO 

041 CF3NO2 	F 

NO2 Trifluoronitromethane F 
F 

042 CF3NO3 F 

F Trifluoromethanol nitrate NO2
FO 


O
043 CF3NO4 	F 


NO2 Trifluoromethyl peroxonitrate O 

F
F


044 CF3NS FF Sulfur cyanide trifluoride 
045 CF3N3O2S OO 



N Trifluoromethanesulfonyl azide F 

S 

N 
N 

F
F


046 CF3O F Trifluoromethoxy .
F O 

047 CF3S 

F Trifluoromethylthio .
F 
S F 




048 CF4N2O O (Z)-1-Fluoro-2-(trifluoromethyl)diazene 2-oxide F

N 

F 
N 

F 
F 

049 CF4N2O3S2 F F O F F Carbonylbis(imidosulfinyl difluoride) O 
O 050 CF4OSi CO  SiF4 Carbon monoxide  tetrafluorosilane (1/1) 051 CF4O2 FF 

Hypofluorous acid difluoromethylene ester 
F 


F 
O 
O 


052 CF4O2S OO 


Trifluoromethanesulfonyl fluoride F 

S 

F 
F 
F 
N

053 CF5NS F 


F (Trifluoromethyl)imidosulfurous difluoride 
S 

F 


FF 
Element System C -Fe- 
No Hill Formula Structure Formula Name 
054 CFeO FeC=O Monocarbonyliron 
Element System C -Ga- 
No  Hill Formula  Structure Formula  Name  
055  CGaN  GaN=C  Gallium(I) isocyanide  
056  CGaN  GaC=N  Gallium(I) cyanide  

Element System C -H - 
No Hill Formula Structure Formula Name 
057 CHAr CH  Ar Methylidyne  argon (1/1) 
058 CHArN DC=N  Ar 059 CHArO+ Ar  HC+=O 060 CHAr3N HC=N  3Ar 061 CHBr .. 

C 
H 


Br 
062 CHBrClF CHBrClF 063 CHBrClN HC=N  BrCl 064 CHBrF2 CHBrF2065 CHBrOS O=C=S  HBr 066 CHBrO2 CO2  HBr 067 CHBr9Ge3 

Br 
Br Br 
Ge Br Br 
Ge Ge 
Br Br 
Br Br 

068 CHCl 	.. C 
H 


Cl 


069 CHClFN HC=N  ClF 
070 CHClF2O2S OO 


F 

S 


Cl F 071 CHClIN HC=N  ICl 
072 CHClO O H 

Cl 
073 CHCl2F CHCl2F 
074 CHCl3 CHCl3
075 CHF2N F 


H N F 
Hydrogen cyanide  argon (1/1) 
Oxomethylium  argon (1/1) 
Hydrogen cyanide  argon (1/3) 
Bromomethylene 

Bromochlorofluoromethane 
Hydrogen cyanide  bromine chloride (1/1) 
 Bromodifluoromethane 
Carbonyl sulfide  hydrogen bromide (1/1) 
Carbon dioxide  hydrogen bromide (1/1) 
Tris(tribromogermyl)methane 

Chloromethylene 

Hydrogen cyanide  chlorine fluoride (1/1) 
Difluoromethanesulfonyl chloride  

Hydrogen cyanide  iodine chloride (1/1) 
Formyl chloride 

Dichlorofluoromethane 
Chloroform
Difluoromethanimine 


076 077 
078 079 080 081 082 083 
084 085 086 
087 088 
089 
090 091 092 093 094 CHF2N CHF3O2S 
CHGe CHHeN CHK CHKrO+ CHN CHNO 
CHNO3S CHNa CHO 
CHP CHS 
CHS 
CHS+ CHSi CHTi CHWCH2+ 
HC=N  F2 OO 
F 



S 


F 
F 
HC=Ge HC=N  He KCH Kr  HC+=O HC=N 
H 


NCO 
HC=N  SO3 NaCH 
. 


C 
D 


O 
HC=P 
. 


C 
H 


S 

S 
H 
C 
HC+=S HC=Si Ti=CH W=CH 


C
+ 
H 
H 
Hydrogen cyanide  difluorine (1/1) Difluoromethanesulfonyl fluoride 
Germanium methylidyne Hydrogen cyanide  helium (1/1)  Potassium hydrogen monocarbide Formylium  krypton (1/1) Hydrogen cyanide Isocyanic acid 
Hydrogen cyanide  sulfur trioxide (1/1) Sodium hydrogen monocarbide Oxomethyl-d1 
Methylidynephosphine Thioformyl 
Mercaptomethylidyne 
Thioformylium Silicon methylidyne Titanium methylidyne Tungsten methylidyne Methyliumyl 

095 CH2ArF2 CH2F2  Ar Difluoromethane  argon (1/1) 096 CH2ClF CH2ClF Chlorofluoromethane 
097 CH2ClFO H 


O . ClF H 

098 CH2Cl2 CH2Cl2099 CH2F3NS F 

S 

NH2
F 

F 100 CH2Ge H Ge 
H 

101 CH2I2 CH2I2102 CH2N2 HN=C=NH 103 CH2OS O=C=S  H2 104 CH2O2 

O 
H OH 

105 CH2O3 CO2  H2O 106 CH2P H 


.
P H 

107 CH2Si H 

Si H 
108 CH3Ar+ CH3+  Ar 
109 CH3Ar2+ CH3+  2Ar 
110 CH3AsF2 F As 

F
H3C 

111 CH3BF4 CH3F  BF3 112 CH3Ba CH3Ba113 CH3CaO CaOCH3 114 CH3F CH3F Formaldehyde  chlorine fluoride (1/1) 
 Dichloromethane 1,1,1-Trifluoromethanesulfenamide 
Germylidene  
 Diiodomethane Carbodiimide Carbonyl sulfide  dihydrogen (1/1) Formic acid  
Carbon dioxide  water (1/1) Methylenephosphinyl 
Silylidene 
Methylium  argon (1/1) Methylium  argon (1/2) Difluoromethylarsine 
Fluoromethane  trifluoroborane (1/1)  Methylbarium Calcium(I) methoxide Fluoromethane 

115 
116 
117 
118 
119 
120 121 122 
123 124 125 
126 
127 128 129 130 CH3FO2S 
CH3F2N 
CH3K 
CH3Li 
CH3Mg 
CH3N CH3NSi CH3Na 
CH3Ne+ 
CH3Ne2+ CH3O+ 
CH3O3Re 
CH3Sr CH4Ar CH4F2O CH4Kr 

OO

S


FH3C 
F
N




FH3C 
H K 
H 


H 
H Li 
H H 
H Mg 
H H 
HC=N  H2 
H3SiC=N 
H Na 
H 


H 
CH3+  Ne 
CH3+  2Ne 

OH C
+ 
H 


H 
O H3CRe 

O O 
CH3Sr 
CH4  Ar 
CH2F2  H2O 
CH4  Kr Methanesulfonyl fluoride 
N,N-Difluoromethanamine 
Methylpotassium 
Methyllithium 
Methylmagnesium 
Hydrogen cyanide  dihydrogen (1/1) 
Silyl cyanide 
Methylsodium

Methylium  neon (1/1) 
Methylium  neon (1/2) 
Protonated formaldehyde 

Methylrhenium trioxide 

Methylstrontium
Methane  argon (1/1) 
Difluoromethane  water (1/1) 
Methane  krypton (1/1) 


131 CH4N2O O Urea 
132 133 134 
135 136 137 138 
139 
140 CH4O2 CH4O3 CH4Si 
CH5ClO CH6 CH6O2 CH9NOSi2 
CH10Ge3 
CH12Ge4 


NH2H2N 
H2CO  H2O 
CH4  O3 

HH Si 
H

H 
CH3OH  HCl CH4  H2 CH3OH  H2O 
H3Si 


CH3 NO H3Si 




GeH3 H3Ge GeH3 

GeH3
H3Ge H3Ge GeH3 
Formaldehyde  water (1/1) Methane  ozone (1/1) Silaethylene 
Methanol  hydrogen chloride (1/1) Methane  dihydrogen (1/1) Methanol  water (1/1) N-Methoxy-N-silylsilanamine 
Methylidynetrisgermane 
Tetrakis(germyl)methane 

Element System C -He- 
No  Hill Formula  Structure Formula  Name  
141  CHeOS  O=C=S  He  Carbonyl sulfide  helium (1/1)  
142  CHeO2  CO2  He  Carbon dioxide  helium (1/1)  

Element System C -I - 
No  Hill Formula  Structure Formula  Name  
143  CIN  IC=N  Cyanogen iodide  
144  CI4  CI4  Tetraiodomethane  

No  Hill Formula  Structure Formula  Name  
145  CInN  InC=N  Indium(I) cyanide  
146  CInN  InN=C  Indium(I) isocyanide  

Element System C -Kr- 
No Hill Formula Structure Formula Name 
147 CKrO CO  Kr Carbon monoxide  krypton (1/1) 
Element System C -Mg- 
No Hill Formula Structure Formula Name 
148 CMgN MgN=C Magnesium(I) isocyanide 
Element System C -N - 
No  Hill Formula  Structure Formula  Name  
149  CNNi  NiC=N  Nickel cyanide  
150  CNZn  ZnC=N  Zinc monocyanide  
151  CN2  N=C=N  Methanetetraylbisamidogen  
152  CN2O  CO  N2  Carbon monoxide  dinitrogen (1/1)  
153  CN2OS  O=C=S  N2  Carbonyl sulfide  dinitrogen (1/1)  
154  CN2O2  CO  N2O  Carbon monoxide  dinitrogen monoxide (1/1)  
155  CN2O2S  O=C=S  N2O  Carbonyl sulfide  dinitrogen monooxide (1/1)  
156  CN2O3  CO2  N2O  Carbon dioxide  dinitrogen monoxide (1/1)  

No  Hill Formula  Structure Formula  Name  
157  CNeO  CO  Ne  Carbon monoxide  neon (1/1)  
158  CNe2OS  O=C=S  2Ne  Carbonyl sulfide  neon (1/2)  

Element System C -O - 
No  Hill Formula  Structure Formula  Name  
159  COPd  PdC=O  Carbonylpalladium  
160  COPt  PtC=O  Carbonylplatinum  
161  COXe  CO  Xe  Carbon monoxide  xenon (1/1)  
162  CO2  CO2  Carbon dioxide  
163  CO2S3  CS2  SO2  Carbon disulfide  sulfur dioxide (1/1)  
164  CO3S2  O=C=S  SO2  Carbonyl sulfide  sulfur dioxide (1/1)  
165  CO4S  CO2  SO2  Carbon dioxide  sulfur dioxide (1/1)  

No Hill Formula Structure Formula Name 
166 C2ClF3O 

Trifluoroacetyl chloride F 
Cl 
F 
F 

167 C2ClF3OS O F F Carbonochloridothioic acid S-(trifluoromethyl) ester Cl 
F 

168 C2ClF3OS O Trifluoroethanethioic acid anhydrosulfide F 
Cl
F


F 169 C2ClF6NS F Bis(trifluoromethyl)amidosulfenyl chloride 




F 
Cl F 
F 

170 C2Cl2F2O 

O Chlorodifluoroacetyl chloride Cl 
Cl 
F 
F 

171 C2Cl6Si 

Cl	Cl 

Cl Trichloro(trichloroethenyl)silane Si 
Cl 
Cl Cl 

Element System C -F - 
No  Hill Formula  Structure Formula  Name  
172  C2FNO2S  O  (Isocyanatothio)formyl fluoride  
F  
 O  
173  C2F3NO3S  F  OO  O  Trifluoromethanesulfonyl isocyanate  
F  F  
174  C2F3NO5  F F  F  O  NO2  Nitro trifluoroacetyl peroxide  





175C2F4 F 

F 
FF 

176 C2F4I I F F 


FF 177 C2F4OS 

O 

F 
F F 
S F 

178 C2F4OS2 

O S 

F 
F S 


F 
F 179 C2F4O2 

O 

F 
F F 
O F 

180 C2F5NOS 

O F F 

S 
N 


F 
F 
F 

181 C2F5NOS 

F F O F 
F SN F 


182 C2F6N2O3 

F 
F 


O 

O 
FN N O 

F 


F 
F 

183 C2F6O5S2 OO OO 




S 


S 
O 



CF3F3C 


Element System C -Fe- 
Tetrafluoroethene 
1,1,2,2-Tetrafluoro-2-iodoethyl 
Carbonofluoridothioic acid S-(trifluoromethyl) ester 
Carbono(dithioperoxo)fluoridic acid 
Carbonofluoridic acid trifluoromethyl ester 
(Trifluoroacetyl)imidosulfurous difluoride 
1,1,1-Trifluoro-N-(fluorocarbonyl)methanesulfinimidoyl fluoride 
1,1,1-Trifluoro-N-(nitrooxy)-N-(trifluoromethyl)methanamine 
Trifluoromethanesulfonic acid anhydride 

No Hill Formula Structure Formula Name 
184 C2FeO2 Fe(CO)2 Irondicarbonyl 
No Hill Formula Structure Formula Name 
185 C2HClF4 

F Cl F FF 
186 C2HCl2FO H Cl 
Cl 
Cl 
187 C2HCl3 

O Cl 
F Cl 

188 C2HF3OS 

O F SH 
F 
F 

189 C2HF3O2 O F 

OH 
F 

F 190 C2HF7O3S2 OO 



F
F S FS 



O FF FF 191 C2HK KC=CH 192 C2HLi LiC=CH 193 C2HN 

C 
H C 



N 194 C2HNa NaC=CH 195 C2HP 

C 
H C 



P 196 C2HSr SrC=CH 2-Chloro-1,1,1,2-tetrafluoroethane 
Dichloroacetyl fluoride 
Trichloroethylene 
Trifluoroethanethioic acid 
Trifluoroacetic acid 
(4,4-Difluoro-2,2-dioxo-1,2.6-oxathiethan-3-yl)pentafluorosulfur(VI) 
Monopotassium acetylide Monolithium acetylide Cyanomethylene 
Monosodium acetylide Phosphinidyneethylidene 
Ethynylstrontium 

No Hill Formula Structure Formula Name 
197 198 
199 
200 201 
202 
203 
204 205 
206 
207 208 
209 
210 211 
C2H2Ar C2H2ArF2 
C2H2ArO 
C2H2Br  C2H2BrF 
C2H2BrF 
C2H2BrF 
C2H2Br2 C2H2Ca+ 
C2H2ClF 
C2H2ClF C2H2ClF2NO 
C2H2ClF3 
C2H2ClI C2H2ClNO HC=CH  Ar HF . Ar 

H
F 
H .


CCO Ar 
H

HC=CH  Br  

Br H 

FH 

Br 
F F 
Br HC=CH  Br2 Ca HCC

H 


Cl 
F HC=CH  ClF O F 

NH2
F 
Cl F 


F 
F 
Cl HC=CH  ICl N 
Cl 


O 

Acetylene  argon (1/1) 1,1-Difluoroethene  argon (1/1) 
Ketene  argon (1/1) 
Ethyne  bromide (1/1) 1-Bromo-1-fluoroethene 
(Z)-1-Bromo-2-fluoroethene 
(E)-1-Bromo-2-fluoroethene 
Acetylene  dibromine (1/1) ((2-Ethyne)calcium (1+) ion 
cis-1-Chloro-2-fluoroethylene 
Acetylene  chlorine fluoride (1/1) 2-Chloro-2,2-difluoroacetamide 
1-Chloro-1,1,2-trifluoroethane 
Acetylene  iodine chloride (1/1) (E)-1-Chloro-2-nitrosoethene 212 C2H2Cl2 H Cl 

Cl 
H 
213 C2H2Cl2O2 

O Cl 
O 


Cl 
214 C2H2Cl3NO 

O Cl 
NH2Cl Cl 

215 C2H2F2Ne H F . Ne H

F 
216 C2H2F3NO 

O 
F NH2F F 

217 C2H2F4 	F 
F 


F 
F 218 C2H2F4 F 

F 
F

F 219 C2H2F4O F 

O 

F FF 
220 C2H2N 	H C 
H 



C 
N 
221 C2H2N2O N
N 


O 


222 C2H2N2O HC=CH  N2O 223 C2H2N2O3S 2(HC=N) SO3 
(E)-1,2-Dichloroethene 
Carbonochloridic acid chloromethyl ester 
2,2,2-Trichloroacetamide 
1,1-Difluoroethene  neon (1/1) 
2,2,2-Trifluoroacetamide 
1,1,1,2-Tetrafluoroethane 
1,1,2,2-Tetrafluoroethane 
Bis(difluoromethyl) ether 
Cyanomethyl 
Furazan 
Acetylene  dinitrogen monoxide (1/1) 
Hydrogen cyanide  sulfur trioxide (2/1) 


224 C2H2O H Ketene 

CCO 
H 225 C2H2O2 O 


H Glyoxal HO 226 C2H2O3 

O Glyoxylic acid H 
OH O 227 C2H2O4 HO O Oxalic acid O 


OH 228 C2H2P H Phosphinidyneethyl C 
H 


C 

P 
229 C2H2Si H 

Ethenylidenesilanediyl CC Si 
H 



Element System C -H - with Three Hydrogen Atoms 
No  Hill Formula  Structure Formula  Name  
230  C2H3 +  Protonated acetylene  
C  C+  H  
H  
H +  

 H  Protonated acetylene, non-classical form  
231  C2H3ArN  H3CN=C  Ar  Methyl isocyanide  argon (1/1)  
232  C2H3As  H3CC=As  Ethylidynearsine  
233  C2H3Cl  H  Vinyl chloride  
H  Cl  





234 C2H3Cl HC=CH  HCl 
235 C2H3ClFN H3C=N  ClF 
236 C2H3ClF2 H H . ClF H

F 
237 C2H3ClO2S O H3C 


Cl 
O S 



OH238 C2H3Cl2NO 
N Cl 



H Cl 239 C2H3Cl2NO HO 

N Cl 

H Cl 
240 C2H3Cl3 Cl 

Cl CH3 Cl 
241 C2H3FO 

F 
O 
242 C2H3F2N H3C=CN  F2 
243 C2H3F2NO 

O F 
NH2 F 

244 C2H3F3O3S OO 


F 

S 

CH3O 

F 
F 

245 C2H3N H NC
H 
H 

Ethyne  hydrogen chloride (1/1) Acetonitrile  chlorine fluoride (1/1) Fluoroethene  chlorine fluoride (1/1) 
Carbonothioic acid anhydrosulfide with thiohypochlorus acid, O-methyl ester 
(E)-Dichloroacetaldehyde oxime 
(Z)-Dichloroacetaldehyde oxime 
1,1,1-Trichloroethane 
Fluorooxirane 
Methyl cyanide  difluorine (1/1) 2,2-Difluoroacetamide 
Trifluoromethanesulfonic acid methyl ester 
Methyl isocyanide 

246 C2H3NO3S H3C=N  SO3 Acetonitrile  sulfur trioxide (1/1) 
247 C2H3NO5 

O Acetyl nitro peroxide O 
O 



NO2H3C 


Element System C -H - with 4 Hydrogen Atoms 
No  Hill Formula  Structure Formula  Name  
248  C2H4ArF2  H3C  F .  Ar  1,1-Difluoroethane  argon (1/1)  
249  C2H4ArF2  F  F  .  Ar  1,2-Difluoroethane  argon (1/1)  
250  C2H4ArO  
 O . Ar  Oxirane  argon (1/1)  
251  C2H4ArS  
 S . Ar  Thiirane  argon (1/1)  
252  C2H4BrF  Br  1-Bromo-1-fluoroethane  



H3C 

253 C2H4BrF H H Fluoroethene  hydrogen bromide (1/1) 
. HBr 
F


254 C2H4Br2 H H Ethene  dibromine (1/1) . Br2 H 
255 C2H4Br2Si H Dibromo(ethenyl)silane 
256 C2H4ClF H2C=CH2  ClF Ethylene  chlorine fluoride (1/1) 257 C2H4ClFO 


O . ClF Oxirane  chlorine fluoride (1/1) 258 C2H4ClFS 



S . ClF Thiirane  chlorine fluoride (1/1) 259 C2H4ClI CH2 Ethylene  iodine chloride (1/1) 


. ICl 
CH2 



260 C2H4ClNO 

OH (E)-Chloroacetaldehyde oxime Cl 
H 

261 C2H4ClNO HO (Z)-Chloroacetaldehyde oxime Cl 
H 
262 C2H4ClPS2 



S 

2-Chloro-1,3,2-dithiaphospholane P Cl S 
263 C2H4Cl2 Cl 1,1-Dichloroethane 
H3C 
264 C2H4Cl2 



Cl 1,2-DichloroethaneCl 
265 C2H4Cl2Si H Dichloro(ethenyl)silane 
H Cl 266 C2H4F2 


F 1,2-Difluoroethane
F 267 C2H4F2O 


O . F2 Oxirane  difluorine (1/1) 
268 C2H4F4 (CH2F2)2 Difluoromethane dimer 269 C2H4KrO 


O . Kr Oxirane  krypton (1/1) 
270 C2H4NeS 



S . Ne Thiirane  neon (1/1) 
271 C2H4O CH4  CO Methane  carbon monoxide (1/1) 272 C2H4OS O (Z)-Methylsulfine 






H 273 C2H4OS CH4  O=C=S Methane  carbonyl sulfide (1/1) 274 C2H4OXe H3C 


O . Xe Oxirane  xenon (1/1) 
No  Hill Formula  Structure Formula  Name  
275  C2H4O3  Glycolic acid  
HO  
OH  
276  C2H4S  S  Ethylene sulfide  



Element System C -H - with 5 Hydrogen Atoms 
No Hill Formula Structure Formula Name 
277 C2H5 H3CCH2 Ethyl 278 C2H5As 


AsH2 VinylarsineH2C 
279 C2H5Br H H Ethene  hydrogen bromide (1/1) . HBr HH 
280 C2H5Cl2N 



Cl N,N-Dichloroethanamine N Cl 


281 C2H5Cl3Si Cl Cl Dichloro(chloromethyl)methylsilane Si 
H3C 



Cl 
H3C 

282 C2H5Cl3Ti Cl Cl Trichloroethyltitanium(IV) Ti 


CH3
Cl 283 C2H5FS 


S . HF Thiirane  hydrogen fluoride (1/1) 
284 C2H5F2OP O Ethylphosphonic difluoride 
F 285 C2H5F2P 
F Ethyldifluorophosphine 
H3C 

286 C2H5NO2 O Glycine 







287	C2H5NO2 

O Methyl carbamate 

CH3H2N 
O 288 C2H5NO2 

N Ethyl nitriteH3C OO 289 C2H5NO3 


OH 2-Nitroethanol O2N 
290 C2H5O3Re OO 


Ethyltrioxorhenium Re CH3O 

291	C2H5P 



PH2 Vinylphosphine 
H2C 292 C2H5Sb H2C 


SbH2 Vinylstibine 
Element System C -H - with 6 Hydrogen Atoms 
No Hill Formula Structure Formula Name 
293	C2H6ArO 
294	C2H6AsF 
295	C2H6Cl2NP 
296	C2H6Cl2Te 
297	C2H6Cl2Ti 
298	C2H6Cl3GeN O 


O 


CH3 . Ar Oxybismethane  argon (1/1) 
H3C 

F Fluorodimethylarsine 
As 


CH3H3C 
H3C 


Cl Dimethylphosphoramidous dichloride NP H3C Cl 


Cl 

Cl Dimethyltellurium dichloride 
Te


CH3H3C 
Cl 

Cl Dichlorodimethyltitanium
Ti



CH3H3C 

OH3C 


Cl O-Trichlorogermyl-N,N-dimethylhydroxylamine N Ge 

Cl 
CH3 Cl 


O 

Cl
299 C2H6Cl3NOSi H3C 
N 


Si 

Cl 
CH3 Cl 


O 

F
300 C2H6F3NOSi H3C 
N 


Si 

F 
CH3 F 

301 C2H6N2O2 H3C 


O NN H3C 

O 


302 C2H6OS 	O S 


CH3
H3C 
303 C2H6O2 


O . H2O 

OH
304 C2H6O2 HO 
305 C2H6O5 

O 
. H2O H 
2 
OH 

306 C2H6S2 SH 
HS 



S 

S
307 C2H6S3 
S 



CH3
H3C 


308 C2H6Se2	

Se 

CH3
Se
H3C 

N-Methyl-N-[(trichlorosilyl)oxy]methanamine 
N-Methyl-N-[(trifluorosilyl)oxy]methanamine 
N-Methyl-N-nitromethanamine 
Sulfinylbismethane 
Oxirane  water (1/1) 1,2-Ethanediol Formic acid  water (2/1) 
1,2-Ethanedithiol Dimethyl trisulfide Dimethyl diselenide 

Element System C -H - with 7 to 14 Hydrogen Atoms 
No Hill Formula Structure Formula Name 
309 C2H7B3 	H nido-1,2-Dicarbapentaborane(7) 
H 

HB BH HB H H 

310 C2H7ClSi 	Cl Chlorodimethylsilane 
SiH H3C 


CH3 
311 
312 
313 314 
315 316 
317 
318 
319 
320 321 
322 
C2H7NO 
C2H8ClNOSi 
C2H8O2 C2H8P2 
C2H8Si C2H9Cl2NSi2 
C2H9GeNO 
C2H9NOSi 
C2H10B8S 
C2H10Si2 
C2H12B10S2 
C2H14AlB3 
H3C NOH H3C 


H H CH3 Si 



N 
Cl 


O 


CH3 
CH3OHCH3OH PH2
H2P 



SiH3H3C 
Cl HH Cl Si Si N 




CH3 H 


CH3 N 
H3C 



GeH3
O 

CH3 N 
H3C 



CH3H3Si O 



S 
BH BH 
HB 
BH BH 
B 
H 


SiH3H3Si 
H 
B 


SH 
HB 
BH 
HS 
B H 

H3CCH

3
HAl H
H 
BB
H
H 
BH
HH

N-Hydroxy-N-methylmethanamine 
N-[(Chlorosilyl)oxy]-N-methylmethanamine 
Methanol dimer 1,2-Diphosphinoethane 
Ethylsilane 1,3-Dichloro-1,3-dimethyldisilazane 
N-(Germyloxy)-N-methylmethanamine 
N-Methoxy-N-methylsilanamine 
7,8-Dicarba-10-thia-nido-undecaborane(10) 
1,2-Ethanediylbissilane 1,12-Dicarbadodecaborane(12)-1,12-dithiol 
2-Dimethyl-2-alumina-arachno-tetraborane(10)  

323 C2H14B3Ga H3CCH3 2-Dimethyl-2-galla-arachno-tetraborane(10) 


Element System C -N - 
No  Hill Formula  Structure Formula  Name  
324  C2NP  N=CC=P  Phosphinidyneacetonitrile  
325  C2N2  N=CC=N  Dicyan  
326  C2N2O  N=CC=NO  Cyanogen fulminate  
327  C2N2O5  N2O  2CO2  Carbon dioxide  dinitrogen monoxide (2/1)  
328  C2N2S  
 Sulfur dicyanide  
N  N  



Element System C -O - 
No  Hill Formula  Structure Formula  Name  
329  C2O2  (CO)2  Carbon monoxide dimer  
330  C2O2S2  CO2  CS2  Carbon dioxide  carbon disulfide (1/1)  

Element System C -S - 
No Hill Formula Structure Formula Name 
331 C2SSi S=C=C=Si 2-Thioxoethenylidenesilanediyl 
Element System C -Y - 
No Hill Formula Structure Formula Name 
332 C2Y YC2 Yttrium dicarbide 

