系列Mn(Ⅱ)配合物的光电性能研究

Photo-electric properties of a series of manganese(Ⅱ) complexes

采用水热方法合成了2个Mn(Ⅱ)配合物[Mn(pzdc)(H2O)2]n(1)(H2pzdc=3,5-吡唑二羧酸),[Mn(phen)(pdc)(H2O)2]·H2O(2)(H2pdc=2,5-吡啶二羧酸),通过单晶X-射线衍射确定了配合物的晶体结构.结构分析表明,配合物1属于单斜晶系,P21/c空间群,在晶体中,中心金属Mn(Ⅱ)离子为6配位,是以3,5-吡唑二羧酸为桥连接起来的具有1D无限结构的配位聚合物;配合物2属于三斜晶系,P-1空间群,在晶体中,中心金属Mn(Ⅱ)离子为6配位,是单核结构,氢键将其连接成具有2D结构的配位超分子.在室温下对配合物的IR和UV-Vis-NIR吸收光谱进行了测定和分析指认.而且利用表面光电压光谱研究了配合物的表面光伏性能.结果表明,配合物1和2在300～500nm范围内呈现出正的光伏响应.并且随着Mn(Ⅱ)离子配位环境不同,光伏响应带数目和强度也明显不同.

Two Mn （ Ⅱ ） complexes [ Mn （pzdc） （ H2 O）2 -]. （1） （ H2 pzdc = 3,57pyrazole dicarboxylic acid） and [Mn （phen） （pdc） （He O）2]·He O （2） （He pdc=2,5-pyridine dicarboxylic acid） have been synthesized by hydrothermal method. The crystal structure of the complexes was determined by sin- gle crystal X-ray diffraction. The structure analysis indicates that complex 1 which is a 1D coordna- tion polymer bridged by 3,5-pyrazole dicarboxylic acid ligand is monoclinic crystal system, P21/c space group, in the structure, the central Mn（ Ⅱ ） ion is six-coordinated; complex 2 which is a 2D su- pramolecular linked by hydrogen bond is triclinic crystal system, P-1 space group, in the structure, the central Mn（ Ⅱ ） ion is six-coordinated. Under the room temperature, the IR and UV-Vis-NIR ab- sorption spectra of the complexes were measured and analyzed. The photo-electric properties were in- vestigated by surface photovoltage spectroscopy （SPS）. The results indicate that the complexes 1 and 2 exhibit positive surface photovoltage responses in the range of 300-500 nm. As the different coordination environment of Mn（ Ⅱ ） ions, the number and intensity of photovoltage response bands are obviously different.