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Spectroscopic Characterizations of Metal-Complexes of 4-hydroxybenzoic acid With the Ni(Ⅱ),Mn(Ⅱ),and Cu(Ⅱ)Ions

光谱学与光谱分析 2021年第6期41卷 1971-1975页

作者： Samar O.Aljazzar Department of Chemistry College of SciencePrincess Nourah Bint Abdulrahman UniversityRiyadh 11671Saudi Arabia

One of the phenolic acids is 4-hydroxybenzoic acid(HBA)which takes the form of a white crystalline solid with a molecular formula of C 7H 6O 3,a melting point of 214.5℃and a molecular weight of 138.12 g·mol^(-1).It soluble in polar organic solvents like acetone and alcohols,and slightly soluble in chloroform and *** reactions between the metal ions and the HBA were carried out under specific conditions like(molar reaction was 2∶2(ligand to metal),reaction temperature was 60℃,media was neutral(pH 7),and solvent was H 2O∶MeOH(1∶1).Under these conditions,the HBA was deprotonated to form(HOC_(6)H_(4)CO^(2);L^(-)).The ligand L-was coordinated to the metal ions forming the metal *** reaction of 4-hydroxybenzoic acid(HOC 6H 4CO 2H;HL)with the Ni(Ⅱ),Mn(Ⅱ)and Cu(Ⅱ)ions afford metal-complexes with gross formula of[Ni_(2)L_(2)(NO_(3))_(2)(H_(2)O)_(4)],[Mn_(2)L_(2)(NO_(3))_(2)(H_(2)O)_(4)]and[Cu_(2)L_(2)(NO_(3))_(2)(H_(2)O)_(4)],*** complexes were characterized by elemental analysis(CHN),magnetic susceptibility,UV-Vis spectra,infrared(IR),and X-ray powder diffraction(XRD)*** complexes of HBA are insoluble in common solvents and hence molar conductance could not be measured,but this very insolubility indicates that the complexes are *** has demonstrated that the ligand(L^(-))was coordinated to the metal ion by bidentate bridging carboxylate group(COO^(-)),with an octahedral ***,HBA is expected to act as bidentate uninegative ions and the coordination number of the metal ions is *** results showed that the complexes possess uniform and organized microstructures in the nanometer range with a main diameter in the range of 11~28 nm.

关键词： 4-hydroxybenzoic acid Metal-complex Spectral analysis Nanostructure

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POLYMER-SUPPORTED β-CYCLODEXTRIN CATALYST FOR SELECTIVE SYNTHESISOF 4-H YDROXYBENZOIC acid

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Journal of Wuhan University of Technology(Materials Science) 1996年第4期11卷 20-23页

作者：张胜民陆宇萍崔崇 Inst.of Mater.Sci.and Tech..Wuhan Univ.of Tech..Wuhan 430070.China Huazhong University of Science and Technology.Wuhan 430074.China

4-hydroxybenzoic acid was synthesized by one pot method using polymer-bonded β-aminopropionic acid-2-β-cyclodextrin as a *** which the selectivity for 4-hydroxybenzoic acid is 87%. A possible carboxylation mechanism... 详细信息

关键词： functional material polymer-supportedcatalyst β-cyclodextrin selective synthesis 4-hydroxybenzoic acid

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How plants synthesize coenzyme Q

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Plant Communications 2022年第5期3卷 63-74页

作者： Jing-Jing Xu Mei Hu Lei Yang Xiao-Ya Chen Shanghai Key Laboratory of Plant Functional Genomics and Resources Shanghai Chenshan Botanical GardenShanghai 201602China Chenshan Plant Science Research Center CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesShanghai 201602China Co-Innovation Center for Sustainable Forestry in Southern China College of Biology and the EnvironmentNanjing Forestry UniversityNanjing 210037China State Key Laboratory of Plant Molecular Genetics CAS Center for Excellence in Molecular Plant Sciences/Shanghai Institute of Plant Physiology and EcologyUniversity of CASChinese Academy of SciencesShanghai 200032China

Coenzyme Q(CoQ)is a conserved redox-active lipid that has a wide distribution across the domains of *** plays a key role in the oxidative electron transfer chain and serves as a crucial antioxidant in cellular *** understanding of CoQ biosynthesis in eukaryotes has come mostly from studies of ***,significant advances have been made in understanding CoQ biosynthesis in *** mitochondrial flavin-dependent monooxygenase and benzenoid ring precursor biosynthetic pathways have been discovered,providing new insights into the diversity of CoQ biosynthetic pathways and the evolution of phototrophic *** summarize research progress on CoQ biosynthesis and regulation in plants and recent efforts to increase the CoQ content in plant foods.

关键词： coenzyme Q 4-hydroxybenzoic acid mitochondria biofortification plant metabolism

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