Synthesis, characterization and determination of absolute structures of palladium complexes of novel chiral acyclic tellurated Schiff base ligands

Rajegowda, H R and Kumar, P Raghavendra and Hosamani, Amar and Butcher, R J (2018) Synthesis, characterization and determination of absolute structures of palladium complexes of novel chiral acyclic tellurated Schiff base ligands. In: NEW JOURNAL OF CHEMISTRY, 42 (8). pp. 6264-6273.

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Abstract

Enantiomerically pure chiral hybrid organotellurium ligands (R)-(LH)-H-1, (S)-(LH)-H-2 and (R)-(LH)-H-3 have been synthesized via condensation of the chiral beta-organotellurated amines 2a, 2b and 2c, respectively, with salicylaldehyde. When these chiral acyclic tellurated Schiff base ligands reacted with Na2PdCl4 in a 1 : 1 molar ratio, they afforded the corresponding orange-red asymmetric complexes Pd(L1-3)Cl] (1-3). All these compounds were characterized by elemental analysis, polarimetry, and H-1, C-13{H-1} 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(5) and P2(1)2(1)2(1), respectively. The characterisation data showed that the ligands coordinated in the deprotonated tridentate (Te, N, O-) mode and acquired a square planar geometry around the central palladium(II) ion along with a monodentate chloro (Cl-) 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) angstrom, 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) angstrom, respectively, in 2. There was intermolecular CH center dot center dot center dot Cl 2.81-2.96 angstrom] and CH center dot center dot center dot O 2.40-2.64 angstrom] hydrogen bonding in 1 and 2, which resulted in supramolecular structures. The Te center dot center dot center dot Cl 3.309-3.710 angstrom] secondary interactions resulted in the helical structure of 1 and dimeric structure of 2 with a short Pd center dot center dot center dot Pd 3.500(1) angstrom] distance. The Flack parameters (x) of 1 0.02(3)] and 2 0.024(12)] confirmed their absolute configurations.

Item Type:	Journal Article
Publication:	NEW JOURNAL OF CHEMISTRY
Publisher:	ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Additional Information:	Copy right for this article belong to ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	16 May 2018 15:57
Last Modified:	16 May 2018 15:57
URI:	http://eprints.iisc.ac.in/id/eprint/59872

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