Abstract
The crystal structure of the rigid bidentate nitrogen ligand bis[
N-(2,6-diisopropylphenyl)imino]acenaphtene (abbr.
o,
o′-
iPr
2C
6H
3-BIAN) and three mixed- ligand copper complexes, namely [Cu
II(AcOH)(
o,
o′-
iPr
2C
6H
3-BIAN)Cl
2]
(1), [Cu
II(acac)(AcOH)(
o,
o′-
iPr
2C
6H
3-BIAN)]·(ClO
4)
(2) (where AcOH=acetic acid and acac=acetylacetonate) and [Cu
IBr(
o,
o′
-iPr
2-
p-BrC
6H
2-BIAN)]
2 (
3) are reported.
In complexes
1 and
2, the coordination around the copper(II) centre is distorted square pyramidal with acetic acid molecule in the apical position. Two imine nitrogen atoms of
o,
o′-
iPr
2C
6H
3-BIAN are occupying the basal plane together with two chloride atoms in case of
1 and two oxygen atoms (from acac ligand) in case of
2. In complex
3 the copper(I) ion is tetrahedrally surrounded by two imine nitrogen atoms of
o,
o′-
iPr
2-
p-BrC
6H
2-BIAN, and by two bridging bromide atoms. Complex formation is followed by certain structural changes inside the rigid N–N ligand. Such changes led to an increased planarity of the
o,
o′-
iPr
2C
6H
3-BIAN backbone, and produced a nearly perpendicular angle between the naphthalene and the aromatic imine planes.