Synthesis of Strapped Porphyrins: Toward Isolation of the Chromophore on Semiconductor Surfaces
作者:Chi-Hang Lee、Elena Galoppini
DOI:10.1021/jo100434t
日期:2010.6.4
Strapped porphyrins, designed to bind planar to semiconductor surfaces, were synthesized as model dyes to study the sensitization processes on metal oxide semiconductor nanoparticles surfaces. The strap was added to limit porphyrin−porphyrin stacking and contacts with the semiconductor, while constraining the anchoring groups’ orientation. Diester ZnPorOMe2 (2b) was made of a Zn(II) 5,10,15,20-tetraphenylporphyrin
合成设计用于结合平面与半导体表面的带状卟啉作为模型染料,以研究在金属氧化物半导体纳米颗粒表面上的敏化过程。添加表带以限制卟啉-卟啉的堆积和与半导体的接触,同时限制了锚定基团的方向。二酯ZnPorOMe 2(2b)由Zn(II)5,10,15,20-四苯基卟啉(ZnTPP)制成,其中5和15个内消旋苯基由1,4-亚苯基双(丁基-4-氧基)束缚单元(表带)并在间位带有甲基苯甲酸酯(锚定基团)。合成过程涉及有用的中间体二溴化物ZnPorOBr 2(2a)。相应的不含金属的H 2 PorOBr 2的X射线结构表明,在晶体中,条带位于大环上方,并相对于卟啉平面倾斜。表征包括1 H- 1 H COSY,1 H- 13 C HMQC和DEPT。与ZnTPP相比,2b的光谱和电化学性质变化不大,表明该性质不受系链或锚定基团的很大影响。2b的HOMO-LUMO间隙在2.14 V时是ZnTPP衍生物的典型特征。化合物2b与TiO