X-ray structure and spectroscopic properties of some lanthanides(III) complexes derived from 2,6-diacetylpyridine-bis(benzoylhydrazone)

• Published in: Inorganic chemistry communications Vol. 6; no. 8; pp. 1004 - 1010
• Main Authors: Tamboura, Farba B., Diop, Mayoro, Gaye, Mohamed, Sall, Abdou S., Barry, Aliou H., Jouini, Tahar
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-08-2003
• Subjects: Crystal structure; Lanthanide complex; Molar conductance; Spectroscopic; Molar conductance; Lanthanide complex; Spectroscopic; Crystal structure
• ISSN: 1387-7003; 1879-0259
• DOI: 10.1016/S1387-7003(03)00167-9

A series of trivalent lanthanide complexes of type [Ln(L) NO
3)(S)
n
](NO
3)
m
(S
′)
n
, have been synthesized by the reaction of 2,6-diacetylpyridine-bis-(benzoylhydrazone) (H
2L) with lanthanide(III) nitrates in ethanol. These complexes have been characterized by analysis, molar conductance, magnetic measurements, infrared spectral studies and X-ray diffraction. The analytical data revealed the formation of 1:1 (metal:ligand) stoichiometry. Molar conductance in dmf gives 2:1 electrolytes in all the complexes. Magnetic moment values are close proximity of the Van Vleck values. IR study suggests the coordination of the ligand through the azomethine and the oxygen of the hydrazonic moiety. The nitrate ion is also found to be bidentate in all the complexes. The crystal structures were determined.
6, C
27H
31N
6O
7S
2Gd:
a=
b=8.6821(4) Å,
c=84.363(5) Å, tetragonal
P4
12
12 and
Z=8. bf 7, C
25H
25N
6O
6SDy:
a=11.750(3) Å,
b=13.250(3) Å,
c=36.000(6) Å,
β=98.50(2), monoclinic,
C2/
c,
Z=8.
9, C
24H
25N
6O
7Yb:
a=10.750(2) Å,
b=17.750(3) Å,
c=14.250(4) Å,
β=99.00(2), monoclinic,
P2
1/
n,
Z=4. In these complexes the lanthanide ion assumes a nine coordinated geometry for Gd and an eight coordinated geometry for Dy and Yb.