Synthesis and structural chemistry of CoII, CuII, CuI and PdII complexes containing a flexible monoselenoether ligand

Abstract

Monoselenoether ligand [PySeCH₂Py] (L) reacts with CoCl₂, CuCl₂, CuI and Pd(OAc)₂ resulting in the formation of molecular or polymeric complexes. The synthesis and structural elucidation of the complexes [CoCl₂(L)] (1), [Cu₂Cl₄(L)₂] (2a), [CuCl₂(L)] (2b), [Cu₂Cl₂(PySe)₂] (2c), [Cu(2-PyCOO)₂] (2d), [Cu₂I₂(L)₂] (3), [Cu₂I₂(L)]_n (4) and [Pd₂(CH₃COO)₂(PySeCHPy)₂]·7H₂O (5) demonstrate the versatility of this class of pyridylselenium ligands. For all compounds, the ligand offers N and/or Se atoms as donors and, in the case of 5, the ligand also builds C–Pd bonds to generate a cyclometallated palladium(II) complex.