Boron bis-(4-methylbenzoxazol-2-yl)-methanide complexes.

Boron compounds have attracted the attention of chemists because of their unique catalytic properties and potential wider material applications. Although group 13 metal compounds, which are based on the bis-(benzoxazol-2-yl)-methane system (Box, ({NCOC 6 H 4 } 2 CH 2 )), have been reported in the last several years, boron containing Box compounds were still missing. Now we report their successful syntheses and spectroscopic characterisation in this work. The borane compound [({NCOC 6 H 3 } 2 CH)BH 2 ] (1) and haloboranes [({NCOC 6 H 3 } 2 CH)BF 2 ] (2), [({NCOC 6 H 3 } 2 CH)BCl 2 ] (3) and [({NCOC 6 H 3 } 2 CH)BBr 2 ] (4) were characterised in the solid state by single crystal X-ray diffraction and in solution by NMR techniques. In addition, the fluorescence properties of compounds 1-4 are communicated.