A new low-nuclear polymolybdate cluster [Cu_4~Ⅱ(opr)_2(Mo_(12)O_(40))]_n·2n H_2 O was successfully isolated by the introduction of flexible multidentate 1,1A-(1,3-propanediyl)bis[2-(2-pyridyl)benzimidazole ligand(opr),(NH_4)_6Mo_7O_(24)·4H_2O,and copper(Ⅱ) ions under hydrothermal conditions. Single-crystal X-ray analysis reveals that the complex crystallizes in the P2_1/n space group with a = 13.8437(5),b =19.3953(6),c =15.7681(6) A,β =112.698(4)o,V = 3905.9(2) A^3,Z = 4,D_c = 2.502 g/cm^3,μ = 3.020 mm^-1,F(000) = 2824,the final R = 0.0352,wR = 0.0523 and S = 0.783 for 7111 observed reflections with I 〉 2σ(I). The structure of the compound contains a new type of low-nuclear(Mo_(12)O_(40))^8-polymolybdate cluster. These dodecamolybdate anions are linked together through sharing edges to form a 1D molybdenum oxide chain. Its photocatalytic performance for methylene blue(MB) was also studied under UV irradiation.
为了获知超声波辅助高压法所提取金针菇黄酮的抑菌和抗氧化活性以及D101型大孔吸附树脂纯化金针菇黄酮的最优条件,利用D101型大孔树脂对超声波辅助高压法所提取的金针菇黄酮进行纯化,并对纯化条件进行了优化研究,而后对纯化后黄酮抑制大肠杆菌、枯草芽孢杆菌、沙门氏菌和金黄色葡萄球菌的能力进行了检测;又以抗坏血酸(VC)为对照,对黄酮清除1,1-二苯基-2-三硝基苯肼自由基(DPPH·)、超氧阴离子自由基(·O_(2)^(-))、羟基自由基(·OH)和2,2-联氮-二(3-乙基-苯并噻唑-6-磺酸)二铵盐自由基(ABTS·)的能力进行测定。结果表明,D101型大孔树脂纯化金针菇黄酮的最适条件为:采用浓度为1.2 mg/m L、p H值为5的上样液,在上样流速为0.75 m L/min的条件下进行吸附;吸附饱和后用70%的乙醇60 m L以1 m L/min洗脱。在此条件下得到的黄酮纯度是纯化前的2.71倍。超声波辅助高压法所提取的金针菇黄酮对四种菌均有不同程度的抑制作用,其抑菌程度大小顺序为:大肠杆菌>沙门氏菌>金黄色葡萄球菌>枯草芽孢杆菌。金针菇黄酮对DPPH·、·O_(2)^(-)、·OH和ABTS·均具有一定的清除能力,但弱于VC。可知超声波辅助高压法所提取的金针菇黄酮具有抑菌及抗氧化活性,D101型大孔吸附树脂纯化金针菇黄酮效果较好。