Synthesis, structures and photophysical properties of two regioisomeric phenalenocarbazoles.

Two regioisomeric phenalenocarbazoles have been synthesized by direct reductive cyclization of 2′-Nitrophenyl-pyrene isomers respectively. Their photophysical properties and crystal structures as well as CV properties were investigated and compared with those of sulfur containing analogues. Although the fluorescence emission properties of 1N are very similar with those of 2N , the HOMO energy level of 1N is 0.16 eV higher than that of 2N indicating that 1N has better electron donating ability. [ABSTRACT FROM AUTHOR]