A square-shaped Ï-conjugated porphyrin tetramer has 
 prepared: the excitation energies of both the Soret and Q bands, 19880 
 (503) and 15180 cmâ1 (659 nm), respectively, are quite low 
 compared with those for the monomer and reported cyclic porphyrin 
 oligomers.
                                    制备出了一种方形的Ï-共轭
卟啉四聚体:与单体和已报道的环状
卟啉低聚物相比,其索雷特带和 Q 带的激发能量(分别为 19880 (503) cmâ1 和 15180 cmâ1 (659 nm))都很低。