Organometallic Solutions: #6

6.* (1995 2 2)

A. Draw all possible stereoisomers of [CoCl2(en)(NH3)2]+. Which are chiral? (en = H2NCH2CH2NH2)

B. Which of the following complexes obey the 18-electron rule: Cr(CO)6, Fe(CN)64-, Co(en)32+.

 

Cr(CO)6

Cr(0) is d6 = 6

CO: 6 x 2 = 12

18

yes

Fe(CN)64-

Fe(II) is d6 = 6

CN: 6 x 2 = 12

18

yes

Co(en)32+

Co(II) is d7 = 7

en: 3 x 4 = 12

19

no