Chromium(III) complexes of Schiff bases

doi:10.1016/S0020-1693(00)86723-7

Inorganica Chimica Acta

Volume 10, 1974, Pages 139-143

https://doi.org/10.1016/S0020-1693(00)86723-7 Get rights and content

Abstract

The preparation, electronic and infrared spectra, and magnetic moments of numerous solid complexes of chromium(III) of the type [Cr(SB)L₂]X·nH₂O (L = NH₃ or H₂O; X = SCN or Cl; n = 1 or O); K[Cr(SB)L₂]H₂O (L′ = CN or ONO); [Cr(SB) (py)(Cl)]; [Cr(SB)(LL)] (LL = acetylacetonate anion); [Cr(SB)(LL)]X·nH₂O (LL = dipyridyl; X = ClO₄; n = 1 or O); H[Cr(SB′)₂]; and [Cr (SB″)₂]X (X = ClO₄) (SB = dianions of the tetradentate Schiff bases derived from salicylaldehyde, orthohydroxyacetophenone, and acetylacetone with ethylenediamine or orthophenylenediamine; SB′ = dianions of the tridentate Schiff bases derived from salicylaldehyde with anthranilic acid, orthoaminophenol or glycine; and SB″ = monoanion of the Schiff base derived from salicylaldehyde and ethanolamine respectively) are reported. Bivalent quandridentate Schiff bases are presumably non planar in [Cr(SB)(LL)] species, while in other complexes they occur square-planar configuration. The nitrite ion in K[Cr(SB) (ONO)₂] is bound to the chromium(III) ion through the oxygen atom.

References (32)

S. Yamada
Coord. Chem. Rev.
(1966)
S. Yamada et al.
Inorg. Chim. Acta
(1971)
A. Takeuchi et al.
Inorg. Chim. Acta
(1967)
L.J. Boucher et al.
J. Inorg. Nucl. Chem.
(1971)
R.H. Holm et al.
Progr. Inorg. Chem.
(1966)
K. Dey, J. Sci. & Ind. Res., in press and references cited...
J.P. Collman et al.
Inorg. Chem.
(1962)
S. Yamada et al.
Bull. Chem. Soc. Japan
(1968)
M.J. O'Connor et al.
Austr. J. Chem.
(1968)
P. Coggon et al.
J. Chem. Soc. (A)
(1970)

S. Yamada et al.

Bull. Chem. Soc. Japan

(1972)

K. Dey et al.

Indian J. Chem.

(1972)

K. Dey and R.L. De, J. Inorg. Nucl. Chem., in...

K. Dey and R.L. De, Unpublished...

K. Dey et al.

Z. anorg. allg. Chem.

(1973)

M. Calligaris et al.

Chem. Comm.

(1969)

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A tridentate ligand (Hpoxap=2-(o-hydroxyphenyliminomethyl)pyridine N-oxide) has been synthesised by the Schiff condensation of 2-pyridinecarboxaldehyde N-oxide with 2-aminophenol. A series of copper(II) complexes with this ONO-donor ligand has been prepared and their spectroscopic properties (electron, vibration, ESR) were studied. The structures for two complexes have been determined by X-ray analysis. The structure of [Cu(poxap)(OAc)] consists of isolated neutral molecules in which the copper(II) atom is situated in a slightly distorted square-planar surrounding. The structure of [Cu(poxap)(H₂O)(NO₃)] consists of neutral molecules which are interconnected by hydrogen bonds giving rise to a ladder structure of copper(II) ions with two different Cu⋯Cu distances of 5.27 and 7.41 Å. The copper atoms are in a slightly distorted square-pyramidal environment with the tridentate ligand poxap⁻ and the water molecule in the basal plane; the apical position being occupied by an oxygen atom of the nitrate anion. Magnetic susceptibility studies were undertaken and these confirm predominantly a dimeric character of the complex.
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Chromium(III) complexes of Schiff bases

Abstract

Coord. Chem. Rev.

Inorg. Chim. Acta

Inorg. Chim. Acta

J. Inorg. Nucl. Chem.

Progr. Inorg. Chem.

Inorg. Chem.

Bull. Chem. Soc. Japan

Austr. J. Chem.

J. Chem. Soc. (A)

Bull. Chem. Soc. Japan

Indian J. Chem.

Z. anorg. allg. Chem.

Chem. Comm.