Platinum(II) and Palladium(II) Saccharinato Complexes With 2,2′:6′,2″-Terpyridine: Synthesis, Characterization, Crystal Structures, Photoluminescence and Thermal Studies

Abstract

[Pd(sac)(terpy)](sac)·4H<inf>2</inf>O (1), [Pt(sac)(terpy)](sac)·5H<inf>2</inf>O (2), [PdCl(terpy)](sac)·2H<inf>2</inf>O (3) and [PtCl(terpy)](sac)·2H<inf>2</inf>O (4) (sac = saccharinate, and terpy = 2,2′:6′,2″-terpyridine) have been synthesized and characterized by elemental analysis, FT-IR, 1H NMR and 13C NMR. In 1 and 2, a tridentate terpy ligand together with an N-coordinated sac ligand form the square-planar geometry around the palladium(II) or platinum(II) ions, while one sac anion remains outside the coordination sphere as a counter-ion. X-ray single crystal studies show that the [M(sac)(terpy)]+ ions in 1 and 2 reside in the centers of a hydrogen bonded honeycomb network formed by the uncoordinated sac ions and the lattice water molecules. Complexes 3 and 4 are isostructural and consist of a [M(Cl)(terpy)]+ cation, a sac anion and two lattice water molecules. The [M(Cl)(terpy)]+ ions interact with each other via M-M and π-π stacking interactions and these π interacted units are assembled to a 2D network by water bridges involving the sac ions and lattice water molecules. Convenient synthetic paths for 1-4 are also presented, and spectral, luminescence and thermal properties were discussed. © 2009 Elsevier B.V. All rights reserved.