The synthesis of a new soluble conjugated porphyrin polymer 4 is reported. The MALDI TOF mass spectrum shows the presence of oligomers with up to 13 repeat units and GPC gives a Mn of 53 kDa. The electronic absorption spectra of this polymer exhibit an intense Q band at 800 nm in solution and 853 nm in the solid state, demonstrating a high degree of conjugation. Electroabsorption spectroscopy shows that thin films of 4 have lower resonant third order NLO susceptibility than our previous conjugated porphyrin polymer 2, whereas closed z-scan measurements indicate that the off-resonance real susceptibility, at 1064 nm, is exceptionally large for both polymers (χ(3)R = −2 × 10−16 m2 V−2). Open z-scan measurements were also made at 1064 nm, demonstrating that the two polymers exhibit similar nonlinear absorption at this wavelength (β = 1 cm GW−1 at 0.2 mM concentration).
报道了一种新型可溶性共轭
卟啉聚合物4的合成。MALDI TOF质谱显示出存在最多含13个重复单元的寡聚物,
GPC测得其Mn为53 kDa。该聚合物的电子吸收光谱在溶液中于800 nm处显示出强烈的Q带,在固态下则为853 nm,表明其具有高程度的共轭性。电吸收光谱显示,聚合物4的薄膜在共振三阶NLO易损性上低于我们之前的共轭
卟啉聚合物2,而闭合Z扫描测量表明,在1064 nm时,两个聚合物的实际非共振易损性(χ(3)R = −2 × 10−16 m2 V−2)都异常大。在1064 nm处还进行了开放Z扫描测量,表明这两种聚合物在该波长下表现出相似的非线性吸收(β = 1 cm GW−1,浓度为0.2 mM)。