Spectroscopic measurements (absorption and photoluminescence) in dilute toluene (10 -5 M) at room temperature were undertaken to understand the photophysical properties of the monomolecular species. The spectra are shown in Figure . For both emitters the absorption band below 400 nm is attributed to a locally excited (LE) π-π* transition of the whole skeleton. The longer wavelength SRCT absorption bands at 494 nm for 3TPA-DiKTa and 554 nm for 3DPA-DiKTa are red-shifted compared to that of DiKTa at 433 nm. The PL maxima of 3DPA-DiKTa occurs at 597 nm and 3TPA-DiKTA occurs at 537 nm, both significantly red-shifted compared to that of DiKTa (λPL= 453 nm); indeed, 3DPA-DiKTa