Three Complexes Based on Synthetic-condition Strategy Involving a Universal Mixed-ligand System

Three coordination polymers([Zn(H_2biim)_2(H_2O)_2]_2·2(HO-BDC)·x(H_2O)(1)[Cd(H_2biim)_2(H_2O)_2]_2·2(HO-BDC)·x(H_2O)(2) and [Co(HO-BDC)(bbi)]n(3)) are obtained by using synthetic-condition strategy in the mixed-ligand system 5-hydroxyisophthalic acid(OH-BDC)together with bisimidazole ligands(2,2?-biimidazole(H2 biim) and 1,1?-(1,4-butanediyl)bis(imidazole)(bbi)). The structure determination reveals that complexes 1 and 2 are zero-dimensional(0 D) structures, and complex 3 is a dinuclear two-dimensional(2D) layer structure. They are all 3D supramolecular networks. The comparisons of the synthetic-condition effects and structure differences among 1 ～3 and our previous work complexes 4([Co_2(HO-BDC)_2(bbi)_2]·H_2O) and 5([Zn(HO-BDC)(bbi)]) have been discussed in detail. Furthermore, the luminescent properties and thermal stabilities of compounds 1～3 in the solid state have been studied.     

微波消解-电感耦合等离子体原子发射光谱法测定钒钛铁精矿中10种主次元素的含量

称取0.100 0g试样于聚四氟乙烯消解罐中,加入3mL盐酸,1mL硝酸,1mL氢氟酸,进行微波消解,消解完成后冷却,加入50g·L-1硼酸溶液10mL,继续消解3min后,将试液用水定容至100mL,采用电感耦合等离子体原子发射光谱法测定其中的钛、硅、铝、钙、镁、钒、锰、磷、镍和铬。运用基体匹配法消除了基体效应。各元素的质量浓度在一定范围内与分析谱线的强度呈线性关系,检出限(3s)在1.2~44μg·L~(-1)之间。采用本方法测定标准样品,结果与认定值相符,测定值的相对标准偏差(n=8)均小于5.0%。本方法对实际样品的测定值与湿法化学法及原子吸收光谱法测得结果一致。