Out of line? Theory predicts that [Ti(N3)4] should exhibit unprecedented linear TiNNN bond angles as a consequence of the α‐N atoms of the azide groups acting as tridentate donors into the empty tetrahedral d0 orbitals of a (+IV) Group 4 metal atom. The title compounds were prepared and characterized (see structure). They do not possess linear TiNNN angles because their coordination numbers exceed four.

Luminescence spectroscopy provides evidence for the efficient photoinduced energy transfer between the Ru II -based metal-to-ligand chargetransfer (MLCT) chromophore and anthracene moieties in two multicomponent, rack-type species that contain Ru II -polypyridine and anthracene subunits. Furthermore, the direction of such an energy transfer can be controlled: the energy-transfer process occurs from the Ru-based chromophore to the anthracene in a rigid matrix at 77 K, whilst in fluid solution at room temperature it occurs from the anthracene subunit to the Ru-based chromophore. The switch in the direction of the energy-transfer process arises from the quite different intrinsic lifetimes of the luminophores and the relatively small energy gap between the lowest energy excited states located in each subunit. The combination of such properties allows a thermal activation of an uphill energy transfer which switches the direction of the intercomponent process. This finding is of interest for the design, based on this relatively unexplored photophysical property, of novel artificial supramolecular systems that are capable of processing information at the molecular level.

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Calix[6]pyrrole and Hybrid Calix[n]furan[m]pyrroles (n + m = 6): Syntheses and Host-Guest Chemistry. --(CAFEO, GRAZIA; KOHNKE, FRANZ H.; LA TORRE, GIOVANNA L.; PARISI, MELCHIORRE F.; PISTONE NASCONE, ROSETTA; WHITE, ANDREW J. P.; WILLIAMS, DAVID J.; Chem. Eur.