A new series of two-dimensional charge-transfer chromophores were designed
and two of them were synthesized. Both theoretical and experimental results
show there is no linear absorption in 620-1200 nm, so two-photon propertie
s can be expected in this range. Two-photon absorption (TPA) cross-sections
were theoretical studied by using quantum-chemical INDO/CI method combined
with sum-over-states expression. The results suggest those compounds posse
ss large TPA cross-sections as well as appropriate corresponding wavelength
s, implying that they are good candidates for two-photon applications. (C)
2001 Elsevier Science B.V. All rights reserved.