Red-black [HIPTN
3N]C
r (
1) ([HIPTN
3N]
3- = [(HIPTNCH
2CH
2)
3N]
3- whe
re HIPT = 3,5-(2,4,6-
i-P
r3C
6H
2)
2C
6H
3 =HexaIsoP
ropylTe
rphenyl) can be p
repa
red f
rom C
rCl
3, while g
reen-black [HIPTN
3N]C
r(THF) (
2) can be p
repa
redf
rom C
rCl
3(THF)
3. Reduction of {
1![](/images/entities/ve<font color=)
rba
r.gif">
2} (which means eithe
r 1 o
r 2) with potassium g
raphite in ethe
r at
roomtempe
ratu
re yields [HIPTN
3N]C
rK (
3) as a yellow-o
range powde
r. The
re is no evidence that dinit
rogen is inco
rpo
ratedinto
1,
2, o
r 3. Compounds that can be p
repa
red
readily f
rom {
1![](/images/entities/ve<font color=)
rba
r.gif">
2} include
red [HIPTN
3N]C
rCO (
4), blood-
red[HIPTN
3N]C
rNO (
6), and pu
rple [HIPTN
3N]C
rCl (
7, upon oxidation of {
1![](/images/entities/ve<font color=)
rba
r.gif">
2} with AgCl). The dich
roic (pu
rple/g
reen)C
r(VI) nit
ride, [HIPTN
3N]C
rN (
8) was p
repa
red f
rom Bu
4NN
3 and
7. X-
ray studies have been ca
rried out on
4,
6,and
7, and on two co-c
rystallized compounds,
7 and [HIPTN
3N]C
rN
3 (65:35) and [HIPTN
3N]C
rN
3 and
8 (50:50).Exposu
re of a degassed solution of {
1![](/images/entities/ve<font color=)
rba
r.gif">
2} to an atmosphe
re of ammonia does not yield "
Cr(NH
3)" as a stable andwell-behaved species analogous to
Mo(NH
3). An attempt to
reduce dinit
rogen unde
r conditions desc
ribed fo
r thecatalytic
reduction of dinit
rogen by [HIPTN
3N]Mo compounds with
8 yielded a substoichiomet
ric amount (0.8 equiv)of ammonia, which suggests that some ammonia is fo
rmed f
rom the nit
ride but none is fo
rmed f
rom dinit
rogen.