1734-16-3Relevant articles and documents
Photochemically driven shape changes of crystalline organic nanorods
Al-Kaysi, Rabih O.,Mueller, Astrid M.,Bardeen, Christopher J.
, p. 15938 - 15939 (2006)
Nanorods composed of 9-tert-butylanthroate (9-TBAE) are synthesized using an Al2O3 template and solvent annealing. The rods consist of micron-scale crystalline domains, and UV light induces a [4 + 4] photodimerization that results in a uniform 15% expansion along the rod axis. This is in contrast to random 9-TBAE crystals, which disintegrate under the same conditions. Transmission electron microscopy, atomic force microscopy, and comparison of the X-ray crystal structures of the monomer and photodimer all provide evidence for a mechanism based on a crystal-to-crystal photoreaction leading to an increase in molecular volume. It is likely that the high surface-to-volume ratio in the nanorods provides a strain relief pathway that is absent in larger crystals. Preliminary attempts to reverse the reaction using shorter wavelength light to photodissociate the dimers were only partly successful. These results suggest that crystalline organic nanostructures may provide an efficient way to transform photochemical energy into mechanical motion on the nanometer scale. Copyright
Reductions of challenging organic substrates by a nickel complex of a noninnocent crown carbene ligand
Findlay, Neil J.,Park, Stuart R.,Schoenebeck, Franziska,Cahard, Elise,Zhou, Sheng-Ze,Berlouis, Leonard E. A.,Spicer, Mark D.,Tuttle, Tell,Murphy, John A.
supporting information; experimental part, p. 15462 - 15464 (2011/02/22)
The first crown-tetracarbene complex of Ni(II) has been prepared, and its crystal structure determined. The complex can be reduced by Na/Hg, with an uptake of two electrons. The reduced complex reductively cleaves arenesulfonamides, including those derived from secondary aliphatic amines, and effects Birch reduction of anthracenes as well as reductive cleavage of stilbene oxides. Computational studies show that the orbital that receives electrons upon reduction of the complex 2 is predominantly based on the crown carbene ligand and also that the HOMO of the parent complex 2 is based on the ligand.
