A Multifunctional,Charge-Neutral,Chiral Octahedral M12L12 Cage

A chiral, octahedral M₁₂L₁₂ cage, which is charge neutral and contains an internal void of about 2000 ų, is reported. The cage was synthesised as an enantiopure complex by virtue of amino-acid-based dicarboxylate ligands, which assemble around copper paddlewheels at the vertices of the octahedron. The cage persists in solution with retention of the fluorescence properties of the parent acid. The solid-state structure contains large pores both within and between the cages, and displays permanent porosity for the sorption of gases with retention of crystallinity. Initial tests show some enantioselectivity of the cage towards guests in solution.     

An angle-resolved photoemission determination of the band-structure of platinum between Γ and X

Synchrotron radiation was used to record angle-resolved normal photoemission spectra of Pt(100) in the photon energy range 6 eV ? hν ? 32 eV. Features were observed in the spectra that arise from both direct transitions and the one-dimensional density of states. Intensity resonances associated with final-state structure near Γ were observed, in accord with earlier data reported for Pt(111). The direct-transition features were used to derive an empirical valence-band structure of Pt between Γ and X, which is in generally good agreement with an existing RAPW calculation.     

An Assessment of the Assignment of Characteristic N-O Vibrations in Aromatic N-Oxides

The use of “characteristic” N-O group frequencies, in characterising metal complexes with aromatic N-oxides is widespread. The most popular assignments of the N-O in-plane and out-of-plane bends of N-oxides are shown to be in error, while the validity of transferring the N-O assignments of pyridine N-oxide to larger aromatic N-oxide systems is cautioned.