72 research outputs found

    Substituent effect on the assembly of coordination polymers containing isophthalic acid and its derivatives

    Get PDF
    通讯作者地址: Yang, SY (通讯作者), Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surface, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, Dept Chem, State Key Lab Phys Chem Solid Surface, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. W Anhui Univ, Dept Chem, Luan 237012, Peoples R China 电子邮件地址: [email protected] coordination polymers [Zn4(H2O)(ip)4(py)6]n1, {[Zn2(hip)2(py)4]2·(py)}n2, [Zn(tbip)(py)2]n3 and [Mn(tbip)(py)2]n4 (H2ip = isophthalic acid, H2hip = 5-hydroxyisophthalic acid, H2tbip = 5-tert-butylisophthalic acid, py = pyridine), have been hydrothermally synthesized and characterized. The photoluminescent properties of 1–3 have also been investigated. For 1–3, as substituents change from H, OH to tert-butyl, the coordination numbers of Zn2+ ions decrease, and the dimensionalities of the structures of 1–3 decrease from 2D (4,4) net, 1D double stranded chain to 1D chain. For 3 and 4, as Mn2+ tends to have a higher coordination number as compared to Zn2+, the structure of 4 is a 2D (4,4) net while the structure of 3 is a 1D chain. The substituents on isophthalic acid influence the coordination environments of metal ions and the coordination modes of the carboxyls, and thus determine the structures of the coordination polymers. The coordination behavior of metal ions also affects the formation of the structures.National Natural Science Foundation of China 20471049 20721001 20725310 20673085 National Basic Research Program of China (973 Program) 2007CB815301 2007CB81530

    大别山-苏北榴辉岩带氧同位素特征及其地质意义

    No full text

    香蕉供应物流模式选择研究

    No full text
    通过对影响香蕉供应物流模式选择和决策的因素进行分析,提出了基于层次分析法的香蕉供应物流模式选择策略,通过建立层次分析模型形成香蕉供应物流模式选择的评价指标体系,通过两两比较的原则计算出各指标的重要性指标-权重,并对判断矩阵的一致性进行计算和检验,进而求出三种供应物流模式(以批发市场为中心的物流模式、以香蕉专业合作组织为中心的物流模式、以龙头企业为中心的物流模式)对每个评价指标的综合选择结果。通过计算分析得出结论:以香蕉专业合作组织为中心的供应物流模式是三种模式中的最合适之选

    武汉东湖沉积物的环境地球化学

    No full text
    武汉东湖沉积物的地球化学过程受到人类活动的较大影响。本文报道该湖沉积物的沉积性状和CN、P、Si、Ca、Mg、Fe、Al、Mn、Cu、Pb、Zn、Cd诸元素在沉积层序中的分布,研究了这些元素的地球化学。通过对东湖污染状况和类型的分析,指出营养物质的积累是导致湖泊生态环境恶化的重要原因,提出可用磷含量作为划分东湖沉积物污染程度的指标的观点
    corecore