Synthesis and structural characterization of Zn2+, Cd2+ and Hg2+ complexes with tripyrrolidinophosphine chalcogenides

Khaled Ebeid, F. Ebnou, M. M'haiham, C.L. Carpenter-Warren, A.M.Z. Slawin, J.D. Woollins, M.T. Ben Dhia, A.H. Barry, M.A.K. Sanhoury

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Abstract

Six new complexes of zinc(II), cadmium(II) and mercury(II) chlorides with tripyrrolidinophosphine chalcogenides of the types [MCl2(Pyrr3PE)2] (M = Zn, E = S (1) or E = Se (2); M = Cd, E = S (3) or E = Se (4)) and [{HgCl(Pyrr3PE)}2(µ-Cl)2] (E = S (5) or Se (6)) have been prepared in yields of 66-92% by reaction of the ligands with metal chloride in ethanol and characterized by 1H and 31P NMR, IR, elemental analysis, conductivity, and single crystal X-ray diffraction analysis. The results show that the complexes are pseudo-tetrahedral containing coordinated chloride ions. Interestingly, the X-ray studies reveal that while the title ligands produce dinuclear complexes with Hg, their Cd and Zn complexes are mononuclear. The tetrahedral bond angles vary from 85.69(5)° to 126.25(4)° in dinuclear complexes 5 and 6 and from 93.51(3)° to 117.38(3)° in mononuclear species 2-4. The E = S bond lengths are in the range 1.999(9)-2.198(2) Å. The coordination properties of the title ligands are discussed and compared to those obtained for their bulkier counterparts.
Original languageEnglish
Number of pages12
JournalJournal of Coordination Chemistry
VolumeLatest Articles
Early online date1 Oct 2021
DOIs
Publication statusE-pub ahead of print - 1 Oct 2021

Keywords

  • Phosphine chalcogenides
  • Pyrrolidine
  • Metal complexes
  • NMR spectroscopy

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