Sonochemical synthesis and characterization of a novel hetro-binuclear metal organic nano polymer based on picolinic acid ligand

Nanoparticles of one new lead and K coordination polymer (CP), {[Pb(pyc)(N)K].½HO} (1) Hpyc = picolinic acid ligand, has been synthesized by use of a sonochemical process and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRPD), Fourier transform infrared spectroscopy (FTIR) spectroscopy and elemental analyses. The single crystal X-ray data of compound 1 imply that the Pb ion is seven coordinated. The thermal stability of compound 1 has been studied by thermogravimetric (TG) and differential scanning calorimetry (DSC). The role of temperature, reaction time and ultrasound irradiation power on the size and morphfology of the nano-structured compound obtained from 1, have been investigated. Results indicate that an increase of temperature and sonication power and a decrease in time reaction led to a decrease of particle size

Achieving Different Morphologies for a Zinc(II) Coordination Polymer by Green Sonochemical Synthesis and New Precursors for the Preparation of Zinc(II) oxide

A new 2D zinc(II) coordination polymer(CP) 1, [Zn(N3)(L)]n(1), [L= 2-picolinate] has been synthesized using branch tube approach. Nano and micro structures of CP 1 were synthesized using sonochemical technique in diverse conditions (different times and solvents) and they were identified by elemental analysis, FT-IR spectra, scanning electron microscopy (SEM) and powder X-ray diffraction (PXRD). Single-crystal X-ray studies show that CP1 contains Zn(II) atoms with different coordination geometries (tetrahedral and octahedral). The effects of solvents and reaction time on the morphology and size of the nano and microstructure of CP 1 were also evaluated. The results showed that change in reaction time has almost no effect on the size of particles, but change in solvent leads to changes in the morphology of particles

Geographic variation in urinary tract and genital cancers in Iran: a hypothesis involving exposure to solar radiation

Abstract Objective Sunlight and vitamin D intake are considered as essential elements for human health. Insufficient intake of this vitamin is one of the causes of various cancers and some other diseases. The aim of this study was to investigate the relation between bladder, prostate, cervical and ovarian cancers with solar ultraviolet exposure in Iran. In this ecological study, data from 30 provinces were studied and analyzed by correlation and linear regression tests in SPSS software version 22. Physical activity, gender, human development index, lung cancer and altitude were adjusted at population level. Results The incidence of bladder cancer in both sexes was inversely related to ultraviolet radiation, but it was significant only in men. Unlike bladder cancer, the incidence of cervical cancer showed a positive relation with ultraviolet radiation. No relation was found between the incidence of prostate and ovarian cancers with ultraviolet radiation. Among the adjusting variables, the incidence of lung cancer (surrogate for smoking) in women had the highest coefficient in the linear regression model

An investigation on the morphology of a new coordination polymer via change effective factors based on eco-friendly sonochemical synthesis; new precursor for the preparation of cadmium(II) oxide

A new 2D cadmium(II) coordination polymer (CP) formulated as [Cd(NCS)(L)(EtOH)2]n(1) [L = isonicotinic acid] was prepared by the branch tube method and the sonochemical method was applied to prepare submicro and micro structures of CP1 under various conditions (different solvents and times). The sonochemical products were characterized by elemental analysis, powder X-ray diffraction (PXRD), FT-IR, and scanning electron microscopy (SEM). The results of a single crystal X-ray analysis of compound 1s how that Cd2+ ion is 6-co-ordinated, isonicotinato and thiocyanato both act as bidentate ligands, and the coordination sphere of the metal ion is octahedrally distorted. The effects of solvents and reaction time on the morphology and size of the sonochemical products were studied, and the results indicate that an increase in time leads to a decrease in the size of the submicro and micro-structures while a change in the solvent has almost no effects on their size

Sonochemical synthesis and characterization of a novel hetro-binuclear metal organic nano polymer based on picolinic acid ligand

Nanoparticles of one new lead and K coordination polymer (CP), {[Pb(pyc)(N)K].½HO} (1) Hpyc = picolinic acid ligand, has been synthesized by use of a sonochemical process and characterized by scanning electron microscopy (SEM), X-ray powder diffraction (XRPD), Fourier transform infrared spectroscopy (FTIR) spectroscopy and elemental analyses. The single crystal X-ray data of compound 1 imply that the Pb ion is seven coordinated. The thermal stability of compound 1 has been studied by thermogravimetric (TG) and differential scanning calorimetry (DSC). The role of temperature, reaction time and ultrasound irradiation power on the size and morphfology of the nano-structured compound obtained from 1, have been investigated. Results indicate that an increase of temperature and sonication power and a decrease in time reaction led to a decrease of particle size

A copper(II) zig-zag metal-organic coordination polymer : synthesis, crystal structure, topology study, hirshfeld surface analysis and survey different conditions on morphology of a novel nano structure [Cu(L)(SCN)(H2O)2]n.2H2O

One copper(II) coordination polymer compound [Cu(L)(SCN)(HO)].2HO (1) where L stand for 2-pyridinecarboxylic acid, was synthesized following two different experimental methods, branch tube and sonochemical irradiation nano methods. Independently of the methodology used, the same crystalline phase is obtained for each compound. Single crystal X-ray analyses on compound 1 showed that Cu ions are 6-coordinated. Additionally, H-bonds incorporate the zig-zag chains in 1 into 2D (along (1,1,0) direction) frameworks. Topological analysis shows that the compound 1 is 2C1 net. Hirshfeld surface analysis of compound 1 was studied. Also, theoretical and experimental morphology were studied. The thermal stability of compound 1 was studied by thermal gravimetric. Finally, the role of reaction time and temperature on growth and final morphology of the structures obtained by sonochemical irradiation are investigated. The results indicated that particle size was reduced with increasing sonication power, temperature, sonication time and decreasing concentration of reactant

Current Treatments and Therapeutic Options for COVID-19 Patients: A Systematic Review

International audienceIntroduction: COVID-19 is the third rising epidemic in the 21st century that quickly turned into a worldwide pandemic. Many clinical studies have been achieved to investigate treatments to confrontation of COVID-19. Therefore, we conducted a systematic reviewto describe the recent treatment strategies to treat COVID-19 patients. Methods: A systematic search was performed in the databases of PubMed, Scopus, Embase, Science direct, Up to date, and Web of Science using the keywords of Coronavirus, COVID-19, SARS-CoV-2, Novel Coronavirus, 2019-nCoV, Treatment, Medicine, Therapy, Intervention, Drug, Medications, and Cure. Results: We included 58 studies including 38 articles (eleven reviews, ten editorial documents, three case reports, one mix method, one cohort study,) and 19 published clinical trials. Review of studies showed that Lopinavir/Ritonavir (n=16), Remdesivir (n=13), Convalescent plasma (n=11), Chloroquine (n=11), Ribavirin (n=9), Hydroxychloroquine sulfate (n=8), Traditional Chinese Medicine (TCM) (n=8), and Arbidol (n=7), were the most frequently used therapies used to treat COVID-19 patients. Conclusion: In the absence of definitive treatment protocols, recently proposed approaches appear to be an effective therapy for accelerating the recovery of COVID-19 patients. Some of these treatments may have been in the early stages of testing. However, future preclinical and clinical trials are warranted to validate findings