Table 1 Currently known and structurally characterized homoleptic transition metal carbonyl cations of group 7–12a

From: Stable salts of the hexacarbonyl chromium(I) cation and its pentacarbonyl-nitrosyl chromium(I) analogue

 

7

8

9

10

11

12

3d

[Mn(CO)6]+ 24

[Fe(CO)6]2+

[Co(CO)5]+

–

[Cu(CO)n]+

(n = 1–4)25,26,27

–

4d

[Tc(CO)6]+ 28

[Ru(CO)6]2+

[Rh(CO)4]+ b

[Pd(CO)4]2+ b

[Pd2(µ-CO)2]2+ c

[Ag(CO)n]+

(n = 1–2)25,27,29

–

5d

[Re(CO)6]+

[Os(CO)6]2+

[Ir(CO)4]+ b

[Ir(CO)6]3+

[Pt(CO)4]2+ b

[Au(CO)2]+

[Hg(CO)2]2+

[Hg2(CO)2]2+

  1. aFrom Group 3–6, no such cations are known. Only structurally characterized examples are shown; transition metal carbonyl cations are only referenced, if not mentioned in the reviews19,20,21,22
  2. bSixteen valence electron species
  3. cBidentate, weakly bridging fluorosulfate groups are present
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