Table 1. Absorption and emission spectral data of the benzoporphyrins.

Compound	λ abs/nm (ε × 105/M–1 cm–1)	λ em/nm
TPBP	465 (5.3), 588 a , 626 a , 640 a , 698 a	720, 787
Zn-TPBP	461 (2.8), 607 a , 652 a	658, 724
Co-TPBP	446 (1.7), 595 a , 640 (0.8)	— b
Ni-TPBP	449 (2.2), 592 a , 644 (0.9)	— b
Cu-TPBP	449 (1.6), 463 (1.9), 601 (0.1), 648 (0.8)	— b
Sn-TPBP	430 (0.3), 466 (4.1), 612 a , 660 (0.9)	665, 745

^aDue to low absorption, the ε value could not be determined.

^bNo emission peak was observed.