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Synthetic two-dimensional Organic structures

Chinese Journal of Polymer Science 2018年第4期36卷 425-425,426-444页

作者： Hui Liu Xiao-Nan Kan Chen-Yu Wu Qing-Yan Pan Zhi-Bo Li Ying-Jie Zhao Qingdao University of Science and Technology Qingdao 266042China Centre for Advanced Macromolecular Design School of Chemical EngineeringThe University of New South WalesSydneyNSW2052Australia

Synthetic two-dimensional（2 D） polymers have totally different topology structures compared with traditional linear or branched polymers. The peculiar 2 D structures bring superior properties. Although, from linear to 2 D polymers, the study of these new materials is still in its infancy, they already show potential applications especially in optoelectronics, membranes, energy storage and catalysis, etc. In this review, we summarize the recent progress of the 2 D materials from three respects：（1） Chemistry—different types of polymerization reactions or supramolecular assembly to construct the 2 D networks were described;（2） Preparation methods—surface science, crystal engineering approaches and solution synthesis were introduced;（3） Functionalization and some early applications.

关键词： two-dimensional structures Interracial synthesis 2D crystal Covalent organic frameworks (COFs) Supramolecular assembly

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Slow Phase Transition-Induced Scan Rate Dependence of Spin Crossover in a two-dimensional Supramolecular Fe(III)Complex

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CCS Chemistry 2023年第2期5卷 412-422页

作者： Zhao-Yang Li Ying-Ying Wu Yao Li Jin-Hua Wang Arshia Sulaiman Mohammad Khurram Javed Ya-Chao Zhang Wei Li Xian-He Bu School of Materials Science and Engineering Nankai UniversityTianjin 300350 Guizhou Provincial Key Laboratory of Computational Nano-Material Science Guizhou Education UniversityGuiyang 550018 College of Chemistry Nankai UniversityTianjin 300071

Spin crossover(SCO)is commonly accompanied by a synchronous phase transition.A few phase transitioncoupled SCO compounds have been reported,yet the synergy between SCO and phase transition on different time scales has not been ***,we report an[Fe(H-5-Cl-thsa-Et)(5-Cl-thsa-Et)]·H2O(1·H2O;H2-5-Cl-thsa-Et=5-chloro-salicylaldehyde ethylthiosemicarbazone)Fe(III)complex that displays a two-dimensional supramolecular structure and SCO behavior above room *** dehydrated form1 exhibits a two-step spin transition with aplateau in the temperature-dependent magnetization(M−T)curve at room temperature and a 51 K thermal hysteresis loop(Tc↑↓=299/248 K)at a rate of 5 K/*** improved SCOperformance in 1 could be attributed to the stronger intralayer but weaker interlayer interactions,which is supported by single-crystal structural analysis and density functional theory ***,complex 1 displays an unusual scan rate-dependent SCO behavior at rates of 0.5−30 K/min,in whichM−T curveplateaus appear at lower scan rates(<10 K/min)but vanish at faster scan rates(≥10 K/min).Scan rate-dependent differential scanning calorimetry,powder X-ray diffractometry,timedependent magnetic moment decays,and infrared spectroscopy consistently reveal that the slow structural relaxation is coupled with a slowcrystallographic phase transition,which is the mechanism for the unusual scan rate-dependent SCO.

关键词： supramolecular two-dimensional structures scan rate dependence spin crossover slow phase transition

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