Abstract
The title complex, [Rb(C11H9N2)(C20H24O6)], has rubidium in an irregular eightfold coordination, with a hexadentate crown ether ligand and a chelating bidentate amidopyridine ligand, each occupying one hemisphere of the coordination. The chelate RbNCN ring is essentially planar, but the two rings of the amidopyridine ligand are not coplanar, because of steric interaction of H atoms on the rings. The Rb—N(amido) bond is shorter than the Rb—N(pyridine) bond.
Highlights
We have recently reported the synthesis and structural characterization of a range of complexes of alkali metals (LiÐCs) with the 2-phenylamidopyridine ligand (LÀ) and the crown ethers 12-crown-4, 15-crown-5 and 18-crown-6 (Liddle & Clegg, 2003; Liddle et al, 2004)
The complex may be described as a contact ionpair, in contrast to several of the crown-ligated complexes of alkali metals with the amide LÀ, which exist in the solid state as separated ion pairs (Liddle et al, 2004)
Data collection: SMART (Bruker, 2001); cell re®nement: local programs; data reduction: SAINT (Bruker, 2001); program(s) used to solve structure: SHELXTL (Sheldrick, 2001); program(s) used to re®ne structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and local programs
Summary
The title complex, [Rb(C11H9N2)(C20H24O6)], has rubidium in an irregular eightfold coordination, with a hexadentate crown ether ligand and a chelating bidentate amidopyridine ligand, each occupying one hemisphere of the coordination. The chelate RbNCN ring is essentially planar, but the two rings of the amidopyridine ligand are not coplanar, because of steric interaction of H atoms on the rings.
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