Chemistry Reference
In-Depth Information
Table 3.2
Properties of tetraalkoxoaluminates and allied derivatives of a few later
3d metals
97
MW
eff
Volatility
found
Dq
(
Ž
C/mm)
(cm
1
)
Compound
Nature
(Calc.)
(B.M./K)
Cr[Al(OPr
i
)
4
]
3
Green viscous
liquid
190/0.6
838
(842)
3.90/100
3.92/297
1527
Mn[Al(OPr
i
)
4
]
2
Brown viscous
liquid
145/0.6
607
(582)
5.95/88
5.90/297
-
Fe[Al(OPr
i
)
4
]
3
Brown viscous
liquid
130/0.8
1003
(846)
5.06/89
5.39/296
-
Fe[Al(OPr
i
)
4
]
2
Brown
semi-solid
125/0.8
605
(582)
4.53/87
5.06/297
-
Co[Al(OPr
i
)
4
]
2
Purple liquid
140/0.6
629
(586)
4.62/92
4.39/297
873
Ni[Al(OPr
i
)
4
]
2
Pink liquid
120/0.6
570
(585)
3.29/90
3.39/294
823 (film)
895 (Pr
i
OH)
912 (py)
Cu[Al(OPr
i
)
4
]
2
Greenish-blue
liquid
135/0.6
604
(593)
1.22/87
1.64/297
1380
Cr[Al(OPr
i
)
3
(OMe)]
3
Light-green
solid
215/0.8
-
3.84/300
1572
Cr[Al(OPr
i
)
2
(OMe)
2
]
3
Green solid
255/0.8
Ł
-
3.86/300
1582
Cr[Al(OEt)
4
]
3
Green solid
235/0.8
Ł
-
3.86/300
1577
120/0.8
Ł
Cr[Al(OCH
2
CF
3
)
4
]
3
Brown viscous
liquid
1353
(1321)
3.86/300
1520
Cr[Al(OPr
i
)
3
(acac))]
3
Green pasty
solid
140/0.8
967
(962)
3.82/300
1675
Cr[Al(OPr
i
)
2
(acac)
2
]
3
Green solid
180/0.8
Ł
1233
(1082)
3.83/300
-
1692
-
Fe[Al(OPr
i
)
2
(OAm
t
)
2
]
3
270/0.6
Ł
Brown solid
976
(1014)
-
-
Ni[Al(OPr
i
)(OBu
t
)
3
]
2
Purple solid
140/0.6
Ł
691
(670)
3.14/88
3.47/300
736
Ni[Al(OPr
i
)
2
(acac)
2
]
2
240/0.6
Ł
Brown pinkish
solid
708
(745)
3.28/300
769
Cu[Al(OCH
2
CF
3
)
4
]
4
Blue semi-solid
115/0.5
-
1.72/300
1602
Cu[Al(OPr
i
)(OBu
t
)
3
]
2
Green solid
150/0.5
Ł
-
1.74/300
1230 (benzene)
1490 (Nujol)
Ł
Indicates sublimation.
1
See Section 2 for details of routes listed.
An interesting trend in the ligating behaviour of fAl
OR
4
g
can be illustrated by
nickel derivatives.
42
The generally bidentate nature of fAl
OR
4
g
, ligands, should be
reflected in the tetrahedral or square planar nature of nickel in NifAl
OPr
i
4
g
2
.However,
its spectral and magneto-chemical properties appear to reveal a tendency for the nickel
atom to achieve octahedral geometry, possibly by adopting a structure of the type
Nif
-OPr
i
3
Al
OPr
i
g
2
in which fAl
OPr
i
4
g
behaves as a tridentate ligand. Its elec-
tronic spectra (Fig. 3.1) show
2
and
3
bands characteristic of octahedral geometry at
about 13 000 and 24 000 cm
1
. In addition, the appearance of a doublet in the region
17 000 - 19 000 cm
1
indicates the presence of some tetrahedral species also in equi-
librium with the octahedral one; the octahedral form becomes predominant in isopropyl
