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photoswitchable Spiropyridine Enabled photoactuation of Polymeric Hydrogels under physiological ph Conditions

Chinese Journal of Polymer Science 2024年第10期42卷 1602-1609,I0015页

作者： Cong Liao Meng-Qi Du Chuang Li Key Laboratory of Precision and Intelligent Chemistry Department of Polymer Science and EngineeringUniversity of Science and Technology of ChinaAnhui230026China

The incorporation of molecular switches into polymer networks has been a powerful approach for the development of functional polymer materials that display macroscopic actuation and function enabled directly by molecular ***,such materials sometimes require harsh conditions to perform their functions,and the design of new molecular photoswitches that can function under physiological conditions is highly ***,we report the design and synthesis of a spiropyridine-based photoswitchable hydrogel that exhibits light-driven actuation at physiological *** to its high p Ka,spiropyridine maintains its ring-open protonated form at neutral ph,and the resulting hydrogel remains in a swollen *** irradiation with visible light,the ring closure of spiropyridine leads to a decrease in the charge and a reduction in the volume of the *** contracted gel could spontaneously recover to its expanding state in the dark,and this process is highly dynamic and reversible when the light is switched on and ***,the hydrogel shows switchable fluorescence in response to visible *** deformation is observed in the hydrogel thin films upon irradiation from one ***,the independence of this spiropyridine hydrogel from the acidic environment makes it biotolerant and shows excellent *** biocompatible spiropyridine hydrogel might have important biorelated applications in the future.

关键词： Spiropyridine photowitch Polymer hydrogel photoactuation physiological ph Biocompatibility

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Crystal Structure of a Nickel(II) Complex with Asymmetric _L-Histidine Ligand

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Chinese Journal of Structural Chemistry 2006年第9期25卷 1047-1050页

作者： JIN Yi CHE Yun-Xia ZHENG Ji-Min Department of Chemistry Nankai University Tianjin 300071 China

A novel nickel（Ⅱ） complex with L-histidine has been synthesized and solved by single-crystal X-ray diffraction analysis at physiological ph. The title complex （C7H16NiN4O6S, Mr = 343.01） crystallizes in monoclinic, space group P21 with a = 7.2194（7）, b = 7.5968（7）, c = 12.2797（11） A, β = 93.3110（10）°, V = 672.35（11） A^3, Z = 2, Dc= 1.694 g/cm^3, F（000） = 356, μ（MoKα） = 1.626 mm^-1, T = 293（2） K, the final R = 0.0184 and wR = 0.0426 for 2207 observed reflections with 1 〉 2σ（I）. The complex provides insights into a possible structural arrangement between nickel （Ⅱ） and L-histidine which may be physiologically important and abundantly present in biological systems.

关键词： crystal structure synthesis L-histidine nickel physiological ph

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