Metal Carbonyl Complexes

Metal Carbonyl Complexes

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Double-click atoms to measure distances.

Does observed geometry match
18-electron count predictions?

Cr(0) Mo(0) W(0)
Mn(I) Tc(I) Re(I)
Fe(II) Ru(II) Os(II)
V(-I) Nb(-I) Ta(-I)
Ti(-II) Zr(-II) Hf(-II)

Fe(0) Ru(0) Os(0)
Fe₂(CO)₉ Fe₃(CO)₁₂
Mn(-I) Re(-I)
Cr(-II) Mo(-II)
Co(I) Rh(I)
Pd(II) Pt(II)

Ni(0)
Co(-I)
Fe(-II)
Cu(I)

Mn(0) Tc(0) Re(0)
Cr(-I) Mo(-I) W(-I)

Co(0) Rh(0) Ir(0)
Co(0) occasionally or Co₄(CO)₁₂
Fe(-I) Ru(-I) Os(-I)

Nb(I) Ta(I)

Ta(0)

Ni(-II) Pt(-II)

Some electron counting problems

cis-Fe(CO)₄I₂ trans-Cr(CO)₄(PPh₃)₂ fac-Fe(CO)₃I₃^– mer-Re(CO)₃H(PPh₃)₂

Fe(CO)₄(PPh₃) Fe(CO)₃(PPh₃)₂

Cr(CO)₄(PMe₂CH₂CH₂PMe₂)
Ru(CO)₃H(P^tBu₂CH₂CH₂P^tBu₂)⁺

Os₂(CO)₈I₂ Re₂(CO)₈(PPh₃)₂ Mo₂(CO)₈I₂ W₂(CO)₈(PPh₂)₂

Mn₃(CO)₁₄^– FeRe₂(CO)₁₄ Re₂Pt(CO)₁₂ Os₃(CO)₁₂I₂

Ru₃(CO)₁₀(PPh₂CH₂CH₂PPh₂)
Ru₂(CO)₈Pt(PPh₂CH₂CH₂PPh₂)

Fe₂Co₂(CO)₁₁(PPh)₂ Co₃(CO)₆(PPh₂)₃

Pd₃(μ₃-CO)(μ-PPh₂CH₂PPh₂)₃⁺²

MnFe(CO)₈(PH₂) W₂(CO)₁₀Sn(py)₂ Fe₃(CO)₁₂(AsH)^-2 Mn₃(CO)₁₃Br(PH)

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Me = -CH₃, ^tBu = -C(CH₃)₃, Ph = -C₆H₅,
py = C₅H₅N, pz = NC₄H₄N
Counter ions not shown.
See original references for the crystal structures.
Sets in { } count as one problem.

This page created by George Lisensky, Beloit College. Last modified February 20, 2023.

CO N NO C C=C Cp Cp2 MM MM2 Z

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