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CHEG 606 – Electron

Counting

Ligand Char

ge

Electr

onsCH3 -1 2CN -1 2

=CRR’ (carbene) 0 2CNR 0 2CO 0 2

CR +1 2F, Cl, Br, I -1 2H -1 2HC=CH 0 2HC!CH 0 2HO 0 2NO (Bent "#N#O) -1 2NO (linear "#N#O) +1 2NR -1 2NR3 0 2OR -1 2$R3 0 2%iR3 -1 2%O 0 2%R 0 2&3#C3H' (alll) +1 2

!CR (carbne) 0 3

=O -2 4=% -2 4-1 4

&#CH* 

(b+tadiene)

0 4

&'#C'H' 

(ccloentadienl

)

-1 6

&*#C*H* (ben-ene) 0 6

&.#C.H. (troli+/

ion)

+1 6

!N -3 6

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Ele/ent Electrons0g 11 (d10s1)0+ 11 (d10s1)Co 9Cr 6C+ 11 (d10s1)Fe 8H1  4

Ir 9"n 7"o 6Nb Ni 10Os 8$d 10$t 10Re 7Rh 9R+ 82a 2c 72i 4 4 65r 4