在自然界中，季节变换带来了树叶色彩的丰富变化，尤其是秋天的树叶变色现象，吸引了无数目光和科学探索。但在这背后，是一系列复杂的化学变化和色素分子结构的巧妙调整。本文将深入探讨秋天树叶变色的化学结构基础。

A mononuclear Co^Ⅱ complex, [Co(H₂dapsc)(H₂O)Cl]Cl·2H₂O (1), with a pentagonal bipyramidal configuration was obtained by reflux reaction of CoCl₂·6H₂O and 2, 6-diacetylpyridine-bis(semicarbazone) (H₂dapsc) in a mixed solvent of water and ethanol. The neutral ligand H₂dapsc molecule provides five coordination atoms to form the equatorial plane of 1, while a water molecule and a Cl^- ion occupy their axial positions. At the same time, the solid structure contains a valence counteranion Cl^- ion and two lattice water molecules. The study of DC magnetic susceptibility indicates that complex 1 has strong magnetic anisotropy. The AC magnetic properties show the existence of slow magnetic relaxation behavior, which is dominated by both direct and Raman processes. The energy barrier for magnetization reversal was 55.55 K. Based on theoretical calculations, it can be concluded that the main reason for the slow magnetic relaxation behavior is the rhombic anisotropy of the pentagonal bipyramidal structure. The calculated D and E values were 45.68 and-0.32 cm^-1.

专业内的实验课程在学生实践能力和综合科学素质培养上起到承上启下的作用。将“五措并举”科教融合的实验教学模式应用于“专业实验”课程建设中，从思政教育提实效、教学项目重融合、科研习惯厚基础、教学环节强实践、实验成果促创新等方面进行教学改革。以思政引领为基，科教融合为魂，开发综合型、探究型的实验项目、培养良好的实验习惯、融入研讨式实验过程，提高学生科学素养的同时，促进学生创新意识的启蒙和科技创新能力的培养，有效提升立德树人育人成果。

羰基氧鎓作为活泼中间体，很容易发生多种反应。本文介绍了大学有机化学教学中涉及到的羰基氧鎓的五类反应，即加成、取代、分解、异构和周环，讨论了羰基氧鎓作为关键中间体在各种复杂有机反应机理中扮演着重要角色。需要注意的是，羰基氧鎓的反应复杂多变，多类反应存在竞争与共存。深入学习羰基氧鎓的五类反应，有助于有机化学科学思维和科学素养的养成，践行“有机化学是科学也是艺术”的教学理念。

采用气固法制备了磷化钼-碳纳米花(MoP-CFs)，通过简单的超声自组装将C₆₀修饰在MoP-CFs表面，形成范德瓦耳斯异质结。研究其电催化析氢性能发现，C₆₀的修饰能够有效降低电催化析氢过电位。其中，10% C₆₀-MoP-CFs样品(10%为C₆₀的质量分数)表现出最佳催化活性，在酸性和碱性条件下达到10 mA·cm^-2的电流密度时，所需要的过电位分别为158和157 mV，并且具有至少20 h的电催化稳定性。C₆₀与MoP-CFs之间强电子耦合作用促进电子由C₆₀迁移到MoP-CFs表面，有助于减小电荷传输阻力，加快电催化析氢界面反应动力学过程。

A novel Cu-based composite with unique three-dimensional (3D) nanoflower-like morphology and mesoporous structure (abbreviated as Cu-NF) was developed, using zeolitic imidazolate framework-67 (ZIF-67) as precursor via facile Cu ion etching, followed by low-temperature calcination strategy. The mass ratio of Cu²⁺ to ZIF-67 played a key role in morphology control. Additionally, low-temperature calcination changed the chemical components of the active sites and improved the porosity for mass transportation with the original morphology preserved. Sample Cu-NF-300, calcined at 300 ℃ displayed the best oxygen evolution reaction (OER) performance among all the samples, with a small overpotential of 347 mV in 1.0 mol·L^-1 KOH and a low Tafel slope of 93 mV·dec^-1 for OER. Significant improvement in the electrochemical activity is attributed to the 3D superstructure and low-temperature calcination activation, which offer a simple synthetic strategy for the fabrication of Cu-based electrocatalysts for OER.

化学国家级实验教学示范中心(哈尔滨工业大学)积极响应时代发展对人才培养的新要求，以杰出人才培养为目标，提出“思政引领、科(产)教融合、赛创同行”的人才培养模式，构建了四层次实验课程体系，“五位一体”推进实验实践教学改革，形成具有化学化工特色的杰出人才培养模式与创新创业实践教学体系。中心对实验实践教学改革的探索，取得了明显的成效，成果可为化学类实验教学中心的建设提供一定的借鉴和参考价值。

Different solvothermal reactions of ZnC₂O₄ with oxalic acid (H₂ox) and 1, 2, 4-triazole (Htrz) successfully gave a new quaternary (NJTU-Bai83, NJTU-Bai=Nanjing Tech University Bai's group) and a new quinary (NJTU- Bai84) anionic metal-organic frameworks (MOFs), where NJTU-Bai83=(Me₂NH₂)₂[Zn₃(trz)₂(ox)₃]·2H₂O and NJTU-Bai84=(Me₂NH₂)[Zn₃(trz)₃(ox)₂]·H₂O, respectively. With the [Zn₂(ox)₄(trz)₂] secondary building unit (SBU) in NJTU- Bai83 replaced by the [Zn₃(ox)₂(trz)₆] and planar [Zn(ox)₂(trz)₂] ones in NJTU-Bai84, 2D supramolecular building layers (SBLs) are changed from the A-layer and B-layer to another A-layer, while pillars are transformed from the tetrahedral [Zn(ox)₂(trz)₂] SBU to the irregular tetrahedral [Zn(ox)₂(trz)₂] and planar [Zn(ox)₂(trz)₂] SBUs. Thus, cdq-topological quaternary NJTU-Bai83 is tuned to (4, 4, 8)-c new topological quinary NJTU-Bai84. Two MOFs were well characterized by powder X-ray diffraction, thermogravimetric analysis, elemental analysis, etc.