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Deep eutectic ionic liquids based on DABCO-derived quaternary ammonium salts: A promising reaction medium in gaining access to terpyridines

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Frontiers of Chemical Science and Engineering 2019年第3期13卷 586-598页

作者： Muhammad Faisal azeem haider Quret ul Aein Aamer Saeed Fayaz Ali Larik Department of Chemistry Quaid-I-Azam UniversityIslamabadPakistan

Owing to the directional H-bonding,coordination and π-stacking abilities,terpyridines have been widely used as supramolecular tectons in molecular architectures,skeletons in molecular devices and metallopolymers,and are gaining importance in medicinal *** this paper,we have synthesized,characterized and applied deep eutectic ionic liquids (DEILs) based on 1,4-diazabicyclo[2.2.2]octane;triethylenediamine (DABCO)-derived quatemary ammonium salts for the preparation *** DEILs were synthesized through N-alkylation of DABCO with haloalkanes (1-bromopentane or 1-bromoheptane) followed by mixing and heating with methanol or polyethylene glycol as a hydrogen bond *** synthesized DEILs were structurally characterized by IR and *** formation of deep eutectic solvent was confirmed by freezing point depression,it composition was investigated through phase diagram,and its thermal stability was determined through differential scanning calorimetry,derivative thermogravimetry and thermal gravimetric analysis ***,these DEILs were investigated for their effectiveness towards synthesis of 2,2':6',2"-terpyridine,3,2':6',3"-terpyridineand 4,2':6',4"-terpyridine derivatives through Kr(o)hnke *** results show that these three types ofterpyridines can be obtained in reasonable yields (80%-97%) by the one-pot reaction of 2-,3-or 4-acetylpyridine with a variety of aromatic aldehydes in the presence of DEIL as a reaction medium,sodium hydroxide as a base and ammonium acetate as a cyclizing *** methodology is highly efficient and cost-effective for synthesis of symmetrical as well as unsymmetrical ***,these DEILs can be reused several times without an obvious loss of activity and are non-toxic,low-volatile,biodegradable and highly thermally ***,these DEILs as a non-conventional reaction medium for the synthesis of terpyridines provides appealing opportunities to be investigated in the domain of gr

关键词： terpyridine deep eutectic solvent ionic liquid Krohnke reaction DABCO

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Investigation of functional,physical,mechanical and thermal properties of TiO2 embedded polyester hybrid composites:A design of experiment(DoE)study

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Progress in Natural Science:Materials International 2018年第3期28卷 266-274页

作者： Muhammad azeem Munawar Dirk Wolfram Schubert Shahzad Maqsood Khan Muhammad Atiq Ur Rehman Nafisa Gulld Atif Islam Aneela Sabir Muhammad Shafiq Bilal haider Mudassar Azam Saba Urooge Khan Monika M.Voigt Institute of Polymer Materials Friedrich-Alexander-University Department of Polymer Engineering and Technology University of the Punjab Bavarian Polymer Institute Institute of Biomaterials Friedrich-Alexander-University Institute of Chemical Engineering and Technology University of the Punjab

This paper presents a study on the Design of Experiments(Do E) approach to optimize the fabrication parameters of titania(TiO2) embedded glass fiber reinforced polyester hybrid composites(HCs). HCs of unsaturated polyester resin(UPR) were fabricated using methyl ethyl ketone peroxide(MEKP) as the curing agent by hand lay-up process(HLUP) and compression molding technique(CMT). The fabrication parameters were optimized by Taguchi Do E(an orthogonal array of L25) using 3 control factors(concentration of TiO2, concentration of MEKP and curing temperature) having 5 levels each. Statistical tools were employed to identify significant factors affecting tensile strengths and its reproducibility during HLUP. It was found that the concentration of TiO2in HCs significantly influenced the tensile strength(TS) followed by MEKP concentration and curing temperature. The highest value of TS was obtained at 3 wt% TiO2, 2 wt% MEKP and 80 °C. Nevertheless, the sensitivity of TiO2concentration was basis for fabrication of polyester titania glass fiber hybrids(PTGFHs), which were further investigated for density and void fractions, linear shrinkage, flexural strength, impact strength, hardness and thermal behaviors. Moreover, cross-linking and hydrogen-bonding between polymeric chains, styrene, silica content of glass fiber and TiO2particles in PTGFHs were confirmed by Fourier transform infrared spectroscopy.

关键词： Hybrid composites Polyester Design of experiment Titania

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Reimagining safe lithium applications in the living environment and its impacts on human,animal,and plant system

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Environmental Science and Ecotechnology 2023年第3期15卷 1-13页

作者： Noman Shakoor Muhammad Adeel Muhammad Arslan Ahmad Muhammad Zain Usman Waheed Rana Arsalan Javaid Fasih Ullah haider Imran azeem Pingfan Zhou Yuanbo Li Ghulam Jilani Ming Xu Jorg Rinklebe Yukui Rui Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation and College of Resources and Environmental Sciences China Agricultural UniversityBeijing100193China BNU-HKUST Laboratory of Green Innovation Advanced Institute of Natural SciencesBeijing Normal University at Zhuhai18 Jinfeng RoadTangjiawanZhuhaiGuangdongChina College of Life Sciences and Oceanography Shenzhen UniversityShenzhen518060China Department of Botany University of Lakki MarwatKP28420Pakistan Department of Pathobiology University of Veterinary&Animal SciencesJhang-campusLahore54000Pakistan Crop Science Institute National Agriculture Research CenterIslamabadPakistan Key Laboratory of Vegetation Restoration and Management of Degraded Ecosystems South China Botanical GardenChinese Academy of SciencesGuangzhou510650China Institute of Soil Science PMAS Arid Agriculture UniversityRawalpindi46300Pakistan University of Wuppertal School of Architecture and Civil EngineeringInstitute of Foundation EngineeringWater-and Waste ManagementLaboratory of Soil-and Groundwater-ManagementPauluskirchstraße 742285Germany

Lithium's(Li)ubiquitous distribution in the environment is a rising concern due to its rapid proliferation in the modern electronic *** enigmatic entry into the terrestrial food chain raises many questions and uncertainties that may pose a grave threat to living *** examined the leverage existing published articles regarding advances in global Li resources,interplay with plants,and possible involvement with living organisms,especially humans and ***,Li concentration(1.5 mM in serum)induces thyroid,stomach,kidney,and reproductive system dysfunctions in humans and ***,there is a serious knowledge gap regarding Li regulatory standards in environmental compartments,and mechanistic approaches to unveil its consequences are ***,aggressive efforts are required to define optimum levels of Li for the normal functioning of animals,plants,and *** review is designed to revitalize the current status of Li research and identify the key knowledge gaps to fight back against the mountainous challenges of Li during the recent digital ***,we propose pathways to overcome Li problems and develop a strategy for effective,safe,and acceptable applications.

关键词： Lithium Plants health Soil ecology Domestic and aquatic animals Human health Threshold levels

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