Synthesis and crystal structure of 2-(anthracen-9-yl)-1-(-butyl-dimethyl-sil-yl)-3,6-di-hydro-1λ,2λ-aza-borinine.

The title compound, CHBNSi (), is an asymmetric 1,2,3,6-tetra-hydro-1,2-aza-borinine consisting of a BN-substituted cyclo-hexa-diene analog with a -anthracenyl substituent. A ring-closing metathesis with subsequent substitution of the obtained BCl 1,2-aza-borinine using anthracenyl lithium yielded the title compound . The asymmetric unit ( = 8) belongs to the ortho-rhom-bic space group and shows an elongated N-C bond compared to previously reported BN-1,4-cyclo-hexa-diene [Abbey (2008 ▸) , 7250-7252].

BN-Substitution in Dithienylpyrenes Prevents Excimer Formation in Solution and in the Solid State.

Boron-nitrogen substitutions in polycyclic aromatic hydrocarbons (PAHs) have a strong impact on the optical properties of the molecules due to a significantly more heterogeneous electron distribution. However, besides these single-molecule properties, the observed optical properties of PAHs critically depend on the degree of intermolecular interactions such as π-π-stacking, dipolar interactions, or the formation of dimers in the excited state. Pyrene is the most prominent example showing the latter as it exhibits a broadened and strongly bathochromically shifted emission band at high concentrations in solution compared to the respective monomers.

High molecular weight poly(N-methyl-B-vinylazaborine) - a semi-inorganic B-N polystyrene analogue.

We present the synthesis of a B-N analogue of polystyrene, poly(N-methyl-B-vinylazaborine) in high molecular weight (M = 24.9 kDa). Furthermore, it was possible to prepare a copolymer with the C-C analogue.