Palladium and platinum complexes of chiral and achiral calix[4]arene bisphosphite ligands

Maji, Pathik and Krishnamurthy, Setharampattu S and Nethaji, Munirathinam (2008) Palladium and platinum complexes of chiral and achiral calix[4]arene bisphosphite ligands. In: Polyhedron, 27 (17). pp. 3519-3527.

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Abstract

Chiral and achiral p-tert-butyl-calix[4]arene bisphosphites (L1–L3) have been synthesized by the reaction of p-tert-butyl-calix[4]arene and the phosphorodichloridites, ROPCl2 [R = (1S,2R,5R)-(+)-iso-menthyl (L1), (1R,2S,5R)-(−)-menthyl (L2) or C6H4But-4 (L3)]. These bisphosphites function as chelating ligands in palladium(II) and platinum(II) complexes which are formed in good yields by the reaction of PdCl2(PhCN)2, MCl2(COD) (M = Pd or Pt) or PdMeCl(COD) with the respective calix[4]arene bisphosphite. Single crystal X-ray diffraction studies performed on the complexes [PdCl2(L1)], [PdCl2(L2)], [PdCl2(L3)] and [PtCl2(L3)] reveal a near square planar geometry around the metal with the two chloride ligands in a cis disposition. The crystal packing in the complexes [PdCl2(L1)] and [PdCl2(L2)], which crystallize in the chiral (P6122) space group, shows different hydrophobic channels with intermolecular C–Hcdots, three dots, centeredCl hydrogen bonding. The complexes [PdCl2(L3)] and [PtCl2(L3)] are isostructural and the molecules in the crystal lattice are linked by intermolecular C–Hcdots, three dots, centeredCl and C–Hcdots, three dots, centeredO hydrogen bonds.

Item Type:	Journal Article
Publication:	Polyhedron
Publisher:	Elsevier Science
Additional Information:	Copyright of this article belongs to Elsevier Science.
Keywords:	Calix[4]arene; iso-Menthol;Menthol; Bisphosphites; Palladium;Platinum;C-H center dot center dot center dot Cl and C-H center dot center dot center dot O hydrogen bonds.
Department/Centre:	Division of Chemical Sciences > Inorganic & Physical Chemistry
Date Deposited:	30 Oct 2009 09:49
Last Modified:	19 Sep 2010 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/17811

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