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Synthesis, characterization and determination of absolute structures of palladium complexes of novel chiral acyclic tellurated Schiff base ligands.
- Source :
- New Journal of Chemistry; 4/21/2018, Vol. 42 Issue 8, p6264-6273, 10p
- Publication Year :
- 2018
-
Abstract
- Enantiomerically pure chiral hybrid organotellurium ligands (R)-L<superscript>1</superscript>H, (S)-L<superscript>2</superscript>H and (R)-L<superscript>3</superscript>H have been synthesized via condensation of the chiral β-organotellurated amines 2a, 2b and 2c, respectively, with salicylaldehyde. When these chiral acyclic tellurated Schiff base ligands reacted with Na<subscript>2</subscript>PdCl<subscript>4</subscript> in a 1 : 1 molar ratio, they afforded the corresponding orange-red asymmetric complexes [Pd(L<superscript>1–3</superscript>)Cl] (1–3). All these compounds were characterized by elemental analysis, polarimetry, and <superscript>1</superscript>H, <superscript>13</superscript>C{<superscript>1</superscript>H} NMR and FT-IR spectroscopies. The absolute structures of the complexes 1 and 2 were determined by single crystal X-ray diffraction, and the complexes 1 and 2 crystallized in the hexagonal and orthorhombic crystal systems with the space groups P6<subscript>5</subscript> and P2<subscript>1</subscript>2<subscript>1</subscript>2<subscript>1</subscript>, respectively. The characterisation data showed that the ligands coordinated in the deprotonated tridentate (Te, N, O<superscript>−</superscript>) mode and acquired a square planar geometry around the central palladium(ii) ion along with a monodentate chloro (Cl<superscript>−</superscript>) in 1–3. The Pd–Te, Pd–Cl, Pd–O and Pd–N bond lengths found were 2.5008(9), 2.3286(19), 2.037(6) and 2.009(6) Å, respectively, in 1 and 2.497(2)/2.506(3), 2.293(6)/2.326(6), 2.035(15)/2.030(2) and 1.949(17)/2.010(2) Å, respectively, in 2. There was intermolecular CH…Cl [2.81–2.96 Å] and CH…O [2.40–2.64 Å] hydrogen bonding in 1 and 2, which resulted in supramolecular structures. The Te…Cl [3.309–3.710 Å] secondary interactions resulted in the helical structure of 1 and dimeric structure of 2 with a short Pd…Pd [3.500(1) Å] distance. The Flack parameters (x) of 1 [0.02(3)] and 2 [0.024(12)] confirmed their absolute configurations. [ABSTRACT FROM AUTHOR]
- Subjects :
- METAL complexes
PALLADIUM compounds
SCHIFF bases
Subjects
Details
- Language :
- English
- ISSN :
- 11440546
- Volume :
- 42
- Issue :
- 8
- Database :
- Complementary Index
- Journal :
- New Journal of Chemistry
- Publication Type :
- Academic Journal
- Accession number :
- 129101036
- Full Text :
- https://doi.org/10.1039/c8nj00727f