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
Co(en)32+
Co(II) is d7 = 7
en: 3 x 4 = 12
19
no