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多媒体计算机辅助教学与传统方法相结合,录制实验基本操作和实验过程的录像,运用二维码扫描技术采集实验数据及计算机编程分析处理实验数据,构建可视化、标准化的分析化学实验课教学模式。多年的实践表明:教学效果得到有效提高,实验课学生的实验报告平均分数达到90左右;学生数据处理能力普遍提高,期末考试及格率达到90%,平均成绩达到75分左右;激发学生的科研积极性,50%以上的学生参加了国家、天津市及学校的大学生创新项目;提高了学生的实验技能水平,在近2年天津市大学生化学竞赛中,获得一等奖2项,二等奖2项,三等奖2项的好成绩。 相似文献
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A new dinuclear copper(Ⅱ) complex, [Cu(L)(py)]2 1 (H2L = N-(2-hydroxybenzyl)- salicylaldimine, py = pyridine), has been synthesized and characterized by elemental analysis, IR and UV spectra. 1 crystallizes in space group P2 1/n with a = 8.2106, b = 10.715, c = 17.864A, β = 99.365°, V = 1550.7A3, Z = 4, C19H16CuN2O2, Mr = 367.88, Dc = 1.576 g/cm3,μ(MoKα) = 1.422 mm-1, F(000) = 756, the final R = 0.0280 and wR = 0.0746. Complex 1 is a centrosymmetric dimer with two copper(H) centers, two py ligands and two L2- ligands. Each L2- ligand donates its azomethine nitrogen and one of the phenolate groups to one copper(Ⅱ) ion and shares the other phenolate group between the two copper(H) ions, affording a Cu2O2 plane. Each copper(Ⅱ) center has a slightly distorted square pyramidal geometry with a bridging phenolate group at the apex. Magnetic studies suggest the presence of a weak ferromagnetic interaction Via two phenoxo bridges. The magnetic susceptibility data (2-300 K) of complex 1 were analyzed by means of H = -2JS1S2 -DSz. The least-squares fitting of the data to the theoretical equation leads to J = 10.3 cm-1, g = 2.03, D = 0.67 cm-1 and R = ∑(Xobsd -Xcalcd)2/∑Xobsd2= 2.76 × 10^-3. 相似文献
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