Synthesis and single crystal structures of first examples of tridentate ligands of (Te, N, S) type and their complexes with palladium(II), platinum(II) and ruthenium(II)

Add time:07/23/2019    Source:sciencedirect.com

The First examples of (Te, N, S) type ligands, 2-CH3SC6H4CHNCH2CH2TeC6H4-4-OCH3 (L1) and 2- CH3SC6H4CHNHCH2CH2TeC6H4-4-OCH3 (L2), and their metal complexes, [PdCl(L1)]PF6 · CHCl3 · 0.5H2O (4), [PtCl(L1)]PF6 (5), [PdCl(L2)]ClO4.CHCl3 (6), [PtCl(L2)]ClO4 (7), and [Ru(p-cymene)(L2)](PF6)2 · CHCl3 (8), have been synthesized and characterized. The single crystal structures of 4, 6 and 8 have revealed that both the ligands coordinate in them in a tridentate (Te, N, S) mode. The geometry around Pd in both the complexes has been found to be square planar, whereas for Ru in a half sandwich complex 8, it is found to be octahedral. Between two molecules of 4 there are intra and inter molecular weak Te⋯Cl [3.334(3) and 3.500(3) Å, respectively] interactions along with weak intermolecular Pd⋯Te [3.621(2) Å] interactions. The Pd–Te bond lengths are between 2.517(6) and 2.541(25) Å and the Ru–Te bond length is 2.630(6) Å. The crystal structure of [PdCl2(4-MeO–C6H4– TeCH2CH2NH2)] (9) is also determined. It is formed when KPF6 is not added in the synthesis of 4 and Pd-complex of L1 is recrystallized. Apart from Te⋯Cl secondary interactions, C–H⋯π interactions also exist in the crystal of 9.

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