Synthesis and Optical Properties of 1,2,5,10-Tetraphenylanthra[2,3- b ]phosphole Derivatives.

1,2,5,10-Tetraphenylanthra[2,3- b ]phosphole oxides and 1-methyl-1,2,5,10-tetraphenylanthra[2,3- b ]phospholium salts were prepared, and their optical properties were investigated. The substituent at the para position and the fused anthracene moiety were found to exert significant impacts on the fluorescence properties of the P-bridged 2-styrylanthracene skeleton.