Synthesis, characterization and single crystal structures of chiral Schiff base and its tetranuclear palladium complex with Pd-O-Pd bridging and Pd-Pd bonds

Rajegowda, H R and Kumar, P Raghavendra and Hosamani, Amar and Butcher, R J and Naveen, S and Lokanath, N K (2018) Synthesis, characterization and single crystal structures of chiral Schiff base and its tetranuclear palladium complex with Pd-O-Pd bridging and Pd-Pd bonds. In: JOURNAL OF MOLECULAR STRUCTURE, 1156 . pp. 301-307.

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Abstract

A new chiral Schiff base ligand 2-{N-(2S)-(1-hydroxy-3-phenylpropan-2-yl]ethanimidoyl} phenol ((S)-H2L) was obtained by acid catalyzed condensation of (2S)-(-)-2-amino-3-pheny1-1-propanol with 2-'hydroxyacetophenone. The palladium complex was prepared by treating a solution of (S)-H2L in acetone with a solution of Na2PdCl4 in water in 1:1 M ratio. The new ligand and its complex were characterized by FT-IR, H-1, C-13{H-1} NMR spectroscopy, polarimetry and elemental analysis and their molecular structures were determined by single crystal X-ray diffraction. Both the compounds crystallizes in monoclinic system in the space group P2(1). There exists an intra O-H center dot center dot center dot N (1.62(5) angstrom)] and intermolecular O-H center dot center dot center dot O (1.53(5) angstrom) and C-H center dot center dot center dot O (2.59 angstrom)] hydrogen bonding and secondary interactions in the crystal of (S)-H2L. The structure of the palladium complex was found very interesting wherein the ligand coordinated to metal center as tridentate dianionic (O-, N, O-) fashion, (S)-L, resulting in a tetranuclear palladium cluster, Pd-4((S)-L)(4)]. In these supramolecular structures phenolate oxygen coordinated to Pd(II) ion as Pd-O terminal bonds 1.934(12) - 1.977(11) angstrom] and the alkoxide oxygen coordinated as Pd-O-Pd bridging bonds 1.993(11) - 2.012(12) angstrom]. The Pd N bond lengths found were in the range of 1.949(13) to 1.919(12) angstrom . There exists two asymmetric tetranuclear complex molecules in its crystal lattice. There exists very strong metal-metal bond interaction, Pd(2)-Pd(3) 3.0410(18) angstrom] and Pd(6)-Pd(7) 3.0517(19) angstrom] respectively in the two asymmetric units. (C) 2017 Elsevier B.V. All rights reserved.

Item Type:	Journal Article
Publication:	JOURNAL OF MOLECULAR STRUCTURE
Publisher:	ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Additional Information:	Copy right for the article belong to ELSEVIER SCIENCE BV, PO BOX 211, 1000 AE AMSTERDAM, NETHERLANDS
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	08 Mar 2018 19:10
Last Modified:	08 Mar 2018 19:10
URI:	http://eprints.iisc.ac.in/id/eprint/59100

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