A selective fluorescent probe for GadoliniumIII in water based on a PdII -preorganized chromone-receptor

2021 ◽  
Author(s):  
Daniele Paderni ◽  
Luca Giorgi ◽  
Eleonora Macedi ◽  
Mauro Formica ◽  
Paola Paoli ◽  
...  
Keyword(s):  
Fluorescent Probe ◽  
X Ray ◽  
Solution Studies ◽  
Water Based ◽  
Photochemical Properties ◽  
Synthesis Solution

The synthesis, solution studies, photochemical properties and the X-ray structure of a chromone based fluorescent PdII complex are reported. The ligand cointains two chromone units linked as side arms to...

Nitrogen and Sulfur Co-doped Fluorescent Carbon Dots for the Detection of Morin and Cell Imaging

2018 ◽  
Vol 15 (1) ◽  
pp. 47-55
Author(s):  
Xuebing Li ◽  
Haifen Yang ◽  
Ning Wang ◽  
Tijian Sun ◽  
Wei Bian ◽  
...  
Keyword(s):  
Microwave Heating ◽  
Fluorescent Probe ◽  
Fluorescence Intensity ◽  
Carbon Dots ◽  
Cell Imaging ◽  
Water Soluble ◽  
Heating Process ◽  
X Ray ◽  
Doped Carbon Dots ◽  
Co Doped

Background: Morin has many pharmacological functions including antioxidant, anticancer, anti-inflammatory, and antibacterial effects. It is commonly used in the treatment of antiviral infection, gastropathy, coronary heart disease and hepatitis B in clinic. However, researches have shown that morin is likely to show prooxidative effects on the cells when the amount of treatment is at high dose, leading to the decrease of intracellular ATP levels and the increase of necrosis process. Therefore, it is necessary to determine the concentration of morin in biologic samples. Method: Novel water-soluble and green nitrogen and sulfur co-doped carbon dots (NSCDs) were prepared by a microwave heating process with citric acid and L-cysteine. The fluorescence spectra were collected at an excitation wavelength of 350 nm when solutions of NSCDs were mixed with various concentrations of morin. Results: The as-prepared NSCDs were characterized by transmission electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The fluorescence intensity of NSCDs decreased significantly with the increase of morin concentration. The fluorescence intensity of NSCDs displayed a linear response to morin in the concentration 0.10-30 μM with a low detection limit of 56 nM. The proposed fluorescent probe was applied to analysis of morin in human body fluids with recoveries of 98.0-102%. Conclusion: NSCDs were prepared by a microwave heating process. The present analytical method is sensitive to morin. The quenching process between NSCDs and morin is attributed to the static quenching. In addition, the cellular toxicity on HeLa cells indicated that the as-prepared NSCDs fluorescent probe does not show obvious cytotoxicity in cell imaging. Our proposed method possibly opens up a rapid and nontoxic way for preparing heteroatom doped carbon dots with a broad application prospect.

Synthesis, solution studies and structural characterisation of complexes of a mixed oxa–aza macrocycle bearing pendant amino arms

2000 ◽  
pp. 4122-4129 ◽  
Author(s):  
Lorenzo Tei ◽  
Alexander J. Blake ◽  
Andrea Bencini ◽  
Barbara Valtancoli ◽  
Claire Wilson ◽  
...  
Keyword(s):  
Structural Characterisation ◽  
Solution Studies ◽  
Synthesis Solution

A new supramolecular compound of chrome(III): Synthesis, spectroscopic characterization, X-ray crystal structure, DFT, and solution studies

2010 ◽  
Vol 973 (1-3) ◽  
pp. 1-8 ◽  
Author(s):  
Hossein Eshtiagh-Hosseini ◽  
Zakieh Yousefi ◽  
Masoud Mirzaei ◽  
Ya-Guang Chen ◽  
S. Ali Beyramabadi ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Spectroscopic Characterization ◽  
Supramolecular Compound ◽  
X Ray ◽  
Solution Studies ◽  
Chrome Iii

Chiral Ferrocene Amines Derived from Amino Acids and Peptides:  Synthesis, Solution and X-ray Crystal Structures and Electrochemical Investigations

2000 ◽  
Vol 39 (24) ◽  
pp. 5437-5443 ◽  
Author(s):  
Alexandra Hess ◽  
Jan Sehnert ◽  
Thomas Weyhermüller ◽  
Nils Metzler-Nolte
Keyword(s):  
Amino Acids ◽  
Crystal Structures ◽  
X Ray ◽  
Peptides Synthesis ◽  
Synthesis Solution

scholarly journals A new Rubidium - Bismuth polyphosphate RbBi(PO3)4: Growth, X-ray single crystal and vibrational study

2014 ◽  
Vol 10 (7) ◽  
pp. 2881-2893
Author(s):  
Khaled JAOUADI ◽  
Tahar MHIRI ◽  
Nabil ZOUARI
Keyword(s):  
Single Crystal ◽  
Structural Type ◽  
Inorganic Materials ◽  
X Ray ◽  
Weighted Residuals ◽  
Type Iv ◽  
Anisotropic Temperature ◽  
Solution Studies ◽  
Bridge Oxygen ◽  
Temperature Factors

Solid-solution studies in the ternary Rb2O – Bi2O3 – P2O5 system, carried out in a search for inorganic materials have a considerable interest mainly for their optical properties, specifically in laser technology, yielded the new compound RbBi(PO3)4. Single-crystal X-ray measurement revealed that RbBi(PO3)4 crystallizes in space group P21/c with a structural type IV and has lattice parameters a = 10.430, b = 8.984, c = 12.967 Å,  = 126.1°, Z = 4 and V = 981.6 Å3. The all eighteen atoms were located in the asymmetric unit. Refinement using anisotropic temperature factors for all atoms yielded weighted residuals based on F and F2 values, respectively, of R1 = 0.0131 and WR2 = 0.0252 for all observed reflections. The atomic arrangement can be described as a long chain polyphosphate organization, helical ribbons (PO3)n. Two types of infinite chains, with a period of eight PO4 tetrahedra run along the longest unit-cell directions. Infrared and Raman spectra at room temperature, were investigated, show clearly some characteristics bands of infinite chains structure of PO4 tetrahedra linked by a bridge oxygen.

scholarly journals Studies of new occurrences of bentonite clays in the State of Paraíba for use in water based drilling fluids

2013 ◽  
Vol 66 (4) ◽  
pp. 485-491 ◽  
Author(s):  
Isabelle A. Silva ◽  
Julliana Marques R. Costa ◽  
Romualdo R. Menezes ◽  
Heber S. Ferreira ◽  
Gelmires de A. Neves ◽  
...  
Keyword(s):  
Bentonite Clay ◽  
Particle Size Analysis ◽  
The State ◽  
Size Analysis ◽  
Drilling Fluids ◽  
X Ray ◽  
Clay Deposits ◽  
Water Based ◽  
Bentonite Clays ◽  
New Occurrences

New bentonite clay deposits have recently been discovered in the state of Paraíba, mainly in the municipalities of Cubati and Pedra Lavrada, creating great expectations in view of the possibility of expanding industrial production using these new reserves. The aim of this study was to study the new occurrences of bentonite clay in Paraíba, particularly in the municipality of Pedra Lavrada, for use in water based drilling fluids. The mineralogical properties of the clays were characterized by particle size analysis using laser diffraction, and thermogravimetric and differential thermal analysis, and its chemical composition was analyzed by X-ray fluorescence, X-ray diffraction, cation exchange capacity and specific surface area. The bentonite clays were treated with sodium carbonate at concentrations of 75, 100, 125, 150 and 175mEq/100g of dry clay, to transform them from polycationic to sodium form. For the technological characterization, drilling fluids were prepared according to the standards of Petrobras. The results indicated that the mineralogical composition of the samples consisted of montmorillonite, kaolinite and quartz. As for their rheological properties, the samples were found to partially meet the rheological requirements of the Petrobras standard.

Synthesis Characterization, X-ray Structures, and Solution Studies of Dinuclear Zinc(II) Complexes of Acyclic Schiff Base Ligands

2010 ◽  
Vol 636 (15) ◽  
pp. 2650-2657 ◽  
Author(s):  
Seyed A. Hosseini-Yazdi ◽  
Ali A. Khandar ◽  
Mir Kh. Tabatabai ◽  
Leila Noohinejad
Keyword(s):  
Schiff Base ◽  
Schiff Base Ligands ◽  
X Ray ◽  
Solution Studies
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