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[摘要]：The synthesis and detailed photophysical studies of a series of 2,6-asymmetrically functionalized dithieno[3,2-b:2',3'-d]phospholes are reported. One-photon spectroscopy revealed that the materials show similar significant Stokes shifts supporting very polar excited intramolecular charge-transfer (ICT) states. Investigation of their two-photon absorption (TPA) behavior indicated that the materials are also valuable TPA chromophores with reasonable cross-sections between 285-385 GM in the biologically relevant wavelength range 800-1100 nm. Moreover, the nonlinear optical features of the phosphole derivatives reported herein were found to remain almost unaltered after modification of the phosphorus center, either by oxidation and/or complexation. |
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