Novel Pyridinium Inner Salt Dye and its Complexes: Synthesis, Crystal Structures and Photophysical Properties

作者：Zhou Yong Hong^*; Wang Na Li; Miao Ti Fang; Wang Juan Gang; Wang Zhe Yu

来源：Journal of Fluorescence, 2015, 25(2): 473-479.

DOI：10.1007/s10895-015-1547-8

• Two-photon absorption
• Metal complex
• Pyridinium inner salt dye
• Two-photon excited fluorescence

Two novel metal complexes, namely [Tb-2(L)(6)(H2O)(4)]a <...(NO3)(6)a <...L(2)a <...(H2O)(18) (1) and [Hg(L)Cl-2](n) (2), were obtained by the reaction of D-pi-A (D = donor, pi = conjugated spacer, A = acceptor) type pyridinium inner salt dye, trans-4-[(p-N,N-dimethylamino)styryl]-N-(2-propanoic-acid) pyridinium (L) with corresponding metal salts. Single crystal X-ray diffraction analyses reveal that compound 1 possesses dinuclear motif in which two Tb(III) ions are linked by four carboxylate groups while complex 2 exhibits 1D chain structure based on Hg(II) ions bridged by carboxylate groups. The linear and non-linear optical properties of complexes 1 and 2 have been studied. Both 1 and 2 exhibit intense single-photon excited fluorescence (SPEF) and two-photon excited fluorescence (TPEF) in the red range. Results show that the replacement of central ions from Hg2+ to Tb3+ influence the two-photon absorption cross-section significantly through increasing the density of the chromophore. However, the peak positions of two-photon excited fluorescence are only slightly affected. Compared with L molecule, complex 1 shows enhanced two-photon absorption cross-section and decreased fluorescent lifetime.

• 出版日期2015-3
• 单位淮北师范大学