Coordination preferences of 3,3′-biisoxazolidines: A new kind of conformationally flexible chelating ligand (original) (raw)

Polyhedron, 2005

Abstract

ABSTRACT 3,3′-Bi{2-methyl-5-Ar}isoxazolidines (Ar=2-Py, L1; Ph, L2) were designed as new conformational flexible N-donor multidentates. They readily form complexes with metal ions and the coordination preferences of the ligands were characterized by means of 1H NMR spectroscopy and X-ray crystallography. In the [(Cp*IrCl2)2{L1}] complex the ligand bridges two iridium ions employing pyridyl-N functions, while in [Cp*Ir(L2)Cl]Cl and Cu{L2}Cl2·CHCl3 the ligand forms five-membered chelates via the isoxazolidine nitrogen atoms. Tridentate coordination in [Ni{L1}(H2O)(NO3)]NO3 supports formation of two chelates involving donors of two isoxazolidine and of pyridyl groups, with a facial arrangement of the binding sites around octahedral Ni ions. In associate [UO2(CH3OH)2(NO3)2]·L1 the non-coordinating biisoxazolidine is involved in hydrogen bonding with molecular bis-methanol uranyl nitrate moieties.

Ilona Raspertova hasn't uploaded this paper.

Let Ilona know you want this paper to be uploaded.

Ask for this paper to be uploaded.