SCHEDULED MAINTENANCE
Substituent effects in the formation of aryloxide-bridged europium complexes
Abstract
The reactivity of europium in liquid ammonia with 2,6-disubstituted
phenols has been surveyed and the effect of the 2,6 substituents on the
bridging ability of the aryloxides has been examined. Monomeric and
tetrameric complexes of Eu
II
have been isolated with
tert-butyl and isopropyl substituents,
Eu(OC
6
H
3
Bu
t
2
-2,6)
2
(NCMe)
4
1 and
Eu
4
(µ-OC
6
H
3
Pr
i
2
-2,6)
4
(OC
6
H
3
Pr
i
2
-2,6)
2
(µ
3
-OH)
2
(NCMe)
6
2, respectively, which can be compared to the
previously reported bimetallic complex,
(dme)
2
Eu(µ-OC
6
H
3
Me
2
-2,6)
3
Eu(OC
6
H
3
Me
2
-
2,6)(dme) 3, isolated with methyl substituents
(dme = 1,2-dimethoxyethane). Acetonitrile has been found
to be an excellent solvating ligand for the formation of crystalline
complexes in this series. Complex 1 crystallizes from acetonitrile in
the monoclinic space group P2
1
/c with
a = 11.7117(14),
b = 17.616(2),
c = 18.263(2) Å,
β = 91.318(8)°,
U = 3766.8(7) Å
3
and
D
c
= 1.282 Mg m
-3
for
Z = 4. Complex 2 crystallizes from acetonitrile
in the monoclinic space group P2
1
/n with
a = 13.676(3),
b = 20.325(4),
c = 32.632(6) Å,
β = 91.068(12)°,
U = 9069(3) Å
3
and
D
c
= 1.429 Mg m
-3
for
Z = 4.
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