Table 3.

Photophysical Properties of the metalla-rectangles 1–8.

Molecular- rectangle	Absorption maxima λmax(nm) (Molar extinction co-efficient 10 5 ε M −1 cm −1)	λex(nm)	Emission maxima λmax(nm)
1	280 (2.54), 382(0.12)	298	362, 381
2	292 (0.66), 491 (0.30)	298	335, 352
3	280 (1.02), 437 (0.29), 633 (0.11), 690 (0.09)	330	368, 432
4	272 (1.39), 377(0.17), 562 (0.15), 598 (0.10)	390	527, 560
5	296(2.04), 307(2.23), 327 (1.59), 376 (0.16)	298	362, 381
6	297(0.58), 307(0.64), 327 (0.44), 491 (0.20)	298	335, 345
7	297(1.05), 311(1.24), 328 (1.02), 437 (0.31), 633(0.11), 694 (0.10)	330	368
8	272 (2.52), 377(1.20), 562 (0.15), 602 (0.13)	390	527, 560