A Three-dimensional Ba(Ⅱ) Coordination Polymer Based on H_4AQTC(Anthraquinone-1,4,5,8-tetracarboxylic Acid): Quinone Oxygen Atoms Participate in Coordination

A novel coordination polymer [Ba2(AQTC)(H2O)3]n(1, H4 AQTC = anthraquinone-1,4,5,8-tetracarboxylic acid) has been prepared under hydrothermal conditions and characterized by single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy and thermogravimetric analysis. Two quinone oxygen atoms and all carboxylate oxygen atoms of AQTC4- are involved in coordination. Two equivalent barium ions are mainly linked by carboxylate oxygen atoms into a dimer. Neighbouring dimers are further connected by the AQTC4- ligand through carboxylate oxygen atom, leading to a 1-D chain structure. Every two adjacent chains are mainly further connected by face carboxylate oxygen atoms and water molecule, generating a two-dimensional layer structure. Such 2-D layer structures are connected with O(6) and O(6C) atoms from water molecules to form a 3-D structure. In addition, luminescent properties of 1 are also investigated.     

大学生英语学习自我归因的心理调查和分析

从心理学的角度,以浙江大学城市学院CE3(大学英语3级)本科学生的英语学习成败的心理归因调查数据为主要基础,分析了大学生自我成败归因的特点和趋势,指出了不正确的归因对今后学习动机的激发和保持的负面影响,并提出了解决问题的途径和方法.