Journal article
Copper(II) and zinc(II) co-ordination compounds of tridentate bis(benzimidazole)pyridine ligands. Crystal and molecular structures of bis[2,6-bis(1′-methylbenzimidazol-2′-yl)pyridine]copper(II) diperchlorate monohydrate and (acetonitrile)[2,6-bis(benzimidazol-2′-yl)pyridine](perchlorato)copper(II) perchlorate
Dalton Transactions, (6), pp 1429-1435
1988
Abstract
Compounds are described of general formulae Cu(L
1
)X
2
, Cu(L
1
)
2
X
2
, Cu(L
2
)X
2
, and Cu(L
2
)
2
X
2
with L
1
= 2,6-bis(benzimidazol-2′-yl)pyridine, L
2
= 2,6-bis(1′-methylbenzimidazol-2′-yl)pyridine, and X = Cl, Br, or ClO
4
. For comparison also a few zinc(
II
) halides were prepared and characterized. The compounds were structurally characterized by i.r., ligand-field, and e.s.r. spectra and for two representative cases [Cu(L
1
)(CH
3
CN)(ClO
4
)][ClO
4
](
1
) and [Cu(L
2
)
2
][ClO
4
]
2
·H
2
O (
2
) also by
X
-ray diffraction techniques. Compound (
1
) crystallizes in space group
P
2
1
/
c
with
a
= 14.061(1),
b
= 20.638(1),
c
= 8.273(1)Å, β= 101.119(8), and
Z
= 4;
R
= 0.0366 for 4 265 observed reflections with
I
> 2σ(
I
). Compound (
2
) crystallizes in space group
P
2
1
/
c
with
a
= 8.4824(22),
b
= 29.1965(29),
c
= 16.7393(24)Å, β= 95.836(17)°, and
Z
= 4;
R
= 0.062 for 3 165 observed reflections with
I
> 3σ(
I
). The structure of (
1
) consists of one tridentate chelating L
1
ligand and CH
3
CN, co-ordinated in a square-planar geometry (Cu-N 1.96-2.03 Å) with a perchlorato oxygen at 2.40 Å, thereby completing a five-co-ordinate geometry. A sixth ligand at 2.8 Å(from another perchlorate oxygen) is considered to be semico-ordinating. The structure of (
2
) consists of one tridentate and one bidentate L
2
, chelating in a five-co-ordinate geometry, again tetragonal pyramidal, with the apical ligand (Cu-N 2.51 Å) coming from the bidentate chelating L
2
. The sixth donor atom, again from a perchlorate oxygen, at 2.70 Å is considered to be semi-co-ordinating. Spectroscopic and magnetic data have been used to deduce structures for the other copper(
II
) compounds based on these two
X
-ray structures.
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Details
- Title
- Copper(II) and zinc(II) co-ordination compounds of tridentate bis(benzimidazole)pyridine ligands. Crystal and molecular structures of bis[2,6-bis(1′-methylbenzimidazol-2′-yl)pyridine]copper(II) diperchlorate monohydrate and (acetonitrile)[2,6-bis(benzimidazol-2′-yl)pyridine](perchlorato)copper(II) perchlorate
- Creators
- S. Bamidele SanniHelmut J BehmPaul T BeurskensGerard A van AlbadaJan ReedijkAlbert T. H LenstraAnthony W AddisonMallayan Palaniandavar
- Publication Details
- Dalton Transactions, (6), pp 1429-1435
- Publisher
- Royal Society of Chemistry
- Number of pages
- 7
- Resource Type
- Journal article
- Academic Unit
- Chemistry
- Scopus ID
- 2-s2.0-37049079911
- Other Identifier
- 991019173675904721