First example of bimetallic complex of platinum(II) with a hybrid organotellurium ligand [(4-MeOC6H4Te)CH2CH2OCH2CH2CH2(2-C5H4N)] (L1) containing 20-membered metallomacrocycle ring: synthesis and crystal structure

1-(4-Methoxyphenyltelluro)-2-[3-(6 methyl-2 pyridyl)propoxy]ethane (L1) and its complexes [MCl2(L1)]2 (M = Pd or Pt) have been synthesized. The single crystal X-ray diffraction of [PtCl2(L1)]2 · 2CHCl3 shows a bimetallic complex of platinum(II) containing a 20-membered metallomacrocycle ring, which remains stable in solution as shown by molecular weight and conductance measurements. The Pt–Te and Pt–N bond lengths are 2.5409(3) and 2.087(5) Å, respectively. The protons of CH2 linked to Te show a deshielding > 1 ppm on the formation of the two complexes.