Coordinating ability in DMSO-water 80:20 wt./wt. of the Schiff base N, N′-3,4-toluenebis(salicylideneimine) with divalent cations. Crystal structure of the nickel(II) complex
Potentiometric studies of the Schiff base ligand sal-3,4-toluen ( N, N′-3,4-toluenebis(salicylideneimine)) with Ni(II), Co(II), Zn(II), Cd(II), Mg(II) and Ca(II) have been carried out in DMSO-water (80:20 wt./wt.) at 25°C and 0.5 mol dm −3 in NaClO 4. For all the studied systems the monomer species...
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| Published in: | Inorganica Chimica Acta 1997-03, Vol.256 (2), p.319-325 |
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| Main Authors: | , , , , , , |
| Format: | Article |
| Language: | eng |
| Subjects: | |
| Online Access: | Get full text |
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| Summary: | Potentiometric studies of the Schiff base ligand sal-3,4-toluen (
N,
N′-3,4-toluenebis(salicylideneimine)) with Ni(II), Co(II), Zn(II), Cd(II), Mg(II) and Ca(II) have been carried out in DMSO-water (80:20 wt./wt.) at 25°C and 0.5 mol dm
−3 in NaClO
4. For all the studied systems the monomer species [ML] and [MHL]
+ are found to be formed and their stability constants have been determined. This study in solution led us to establish the best conditions for the preparation of the solid complex Ni(sal-3,4-toluen)·1.5CHCl
3. The molecular structure of this complex has been determined by single-crystal X-ray analysis. The compound crystallises in the triclinic system, space group
P
1
̄
, with
a = 13.855(3), b = 14.591(3), c = 15.247(4)
A
̊
, α = 116.24(2), β = 115.97(2), γ = 91.30(2)°
and Z = 4
. Refinement of the atomic parameters by least-squares gave a final
R1 factor of 0.063 (
wR2 = 0.1820) for 4017 unique reflections having
I ⩾ 2
σ(
I). The coordination geometry around the nickel atom is square planar with a
cis-N
2O
2 donor set. Spectroscopical studies for this complex were also carried out. |
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| ISSN: | 0020-1693 1873-3255 |