Molecular excitons in a copper azadipyrrin complex

Exciton coupling is applied for the first time to successfully explain the excited-state structure of metalloazadipyrrins.

2-Cyclopropylglycinatobis(2,2´-bipyridyl)cobalt(III) Diperchlorate and its Dihydrate

The crystal structures of 2-cyclopropylglycinatobis(2,2�-bipyridyl)cobalt(III) diperchlorate, [Co(cpg)(2,2�- bpy)2](ClO4)2 (1), and its dihydrate [Co(cpg)(2,2�-bpy)2](ClO4)2�2H2O (2), are the first reported structures of a metal complex of 2-cyclopropylglycinate. Mixtures of the two kinds of crystals are formed from solutions that contain an excess of the Δ-R/Λ-S diastereoisomer. This diastereoisomer predominates in the solid state, but small amounts of the Δ-S/Λ-R diastereoisomer are also present, creating a disordered structure. Modelling the disorder to fit the diffraction data gives a diastereoisomeric composition of the crystals that is consistent with the nuclear magnetic resonance data.