Molecular bowls

Stabilization of highly reactive species in molecular bowls and capsules with an endohedral functionality 97LA2393. 

Finally, attention is drawn to the extensive work of Okazaki and co-workers, wherein two terphenyl units have been attached to a central functionality in order to create novel all-carbon molecular bowl-like molecules.97 For example, the novel molecular bowl compound Ar Br (Ar Br = 2,6-bis(CH2C6H3-2,6-Dmp2)-4-/fT/-butyl-l-bromophenyl), was synthesized by a cross-coupling reaction between the Grignard reagent of the iodoterphenyl... 

Dhar S, Chakravarty AR. Photosensitizer in a molecular bowl steric protection enhancing the photonuclease activity of copper(II) scorpionates. Inorg Chem 2005 44 2582-4. 

D. Whang, J. Heo, J.H. Park, K. Kim, A Molecular Bowl with Metal Ion as Bottom Reversible Inclusion of Organic Molecules in Cesium Ion Complexed Cucurbituril , Angew. Chem. Int. Ed., 37,78 (1998)... 

Scheme 1. Synthesis of a trinuclear active site by transferring the catalytic elements confined in the molecular bowl to a polystyrene derivative. [Adapted from Ref. (113).]...

Goto, K. Okazaki. R. Molecular bowls and capsules with an endohedral functionality The stabilization of highly reactive species in their inner phase. Liebigs Ann./Recueil... 

Bonar-Low. R.P. Mackay, L.G. Sanders. J.K.M. Morphine recognition by a porphyrin cyclocholate molecular bowl. J. Chem. Soc.. Chem. Commun. 1993. 456. 

This result was extended with the inclusion of CgHsCN in the molecular bowl (5), see Figure 1 This result offers the possibility that vanadium oxide bowls could be used as molecular containers and may help capture and stabilize interesting molecules. 

Figure 8 A representation of the crystal structure of the NO anion in a vanadate-based molecular bowl. The vanadium ions are shown as the large black spheres and the white spheres are oxygen atoms. The NO molecule is shown as the linked gray and white sphere in the center of the cavity.

A molecule that, in principle, may form a bowl phase should itself have the bowl form like that seen in Fig. 4.15a [7]. Molecular bowls may have different symmetry as shown on the top of Fig. 4.15b and the corresponding phases could be either uniaxial or biaxial. The packing of bowls into the columns may have specific features. For example, when all molecules in the colunui are oriented bottom down then the head-to-to tail symmetry is broken and the column has conical, i.e. polar symmetry Coov> Fig- 4.15c. Only polar colunuis may form ferroelectric or antiferroelectric phases shown in Fig. 4.15d. 

Synthesis, Structures, and Physical Properties of Aromatic Molecular-Bowl Hydrocarbons... 

Abstract This chapter summarizes the synthesis, physical properties, structure, and crystal packing of buckybowls. Buckybowls exemplify an intermediate class of polynuclear aromatic compounds between the closed-shell fullerenes and the flat extended arrays of graphene. These warped sheets can be seen as fragments of fullerenes or the end cap of single-waUed carlxMi nanotubes and, their curvature endows them with physical properties distinct from flat polynuclear hydrocarbons, which opens up unique possibilities for molecular bowls in various organic materials applications. 

---