C₄H₄ (η⁴-cyclobutadiene)

[Fe(CO)(η⁴-C₄H₄)(Dppe-κ²P)]

Formula Unicode styled: 
[Fe(CO)(η⁴-C₄H₄)(Dppe-κ²P)]
Compound name(s): 
Carbonyl-cyclobutadiene-(1,2-bis(diphenylphosphino)ethane)-iron
Central atom: 
Iron
Attached groups: 
CO (carbonyl)
C₄H₄ (η⁴-cyclobutadiene)
Dppe (1,2-bis-(diphenylphosphino)ethane-κ²P)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 2
Oxidation Number (ON) (Roman numerals): 
ON: (II)
Coordination Number (CN, sum of attached group denticities): 
CN: 5
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 18
Summary of calculated classifications: 
Fe«V2C5OIIE18B6Z0X2L4»
[MLXZ]𝘲 class: 
[MX2L4]
MLXZ class (ENC, equivalent neutral class): 
MX2L4

[Co(η⁴-C₄H₄)(Cp)]

Formula Unicode styled: 
[Co(η⁴-C₄H₄)(Cp)]
Compound name(s): 
(Cyclopentadienyl)-(cyclobutadienyl) cobalt
Central atom: 
Cobalt
Attached groups: 
C₄H₄ (η⁴-cyclobutadiene)
Cp (η⁵-cyclopentadienyl)
Charge on central atom: 
0
Compound type: 
Molecular
Valence Number (VN) = 𝘹 + 2𝘻 : 
VN: 3
Oxidation Number (ON) (Roman numerals): 
ON: (III)
Coordination Number (CN, sum of attached group denticities): 
CN: 5
Electron Number (EN) = 𝘮 + 𝘹 +2𝘭: 
EN: 18
Summary of calculated classifications: 
Co«V3C5OIIIE18B6Z0X3L3»
[MLXZ]𝘲 class: 
[MX3L3]
MLXZ class (ENC, equivalent neutral class): 
MX3L3