The stability of aqueous nickel(II) chloride complexes in hydrothermal solutions: Results of UV–Visible spectroscopic experiments

2012 ◽  
Vol 94 ◽  
pp. 276-290 ◽  
Author(s):  
Weihua Liu ◽  
Artas Migdisov ◽  
Anthony Williams-Jones
Keyword(s):  
Hydrothermal Solutions ◽  
Chloride Complexes ◽  
Uv Visible ◽  
The Stability

Structure of the complexes of ethylenediphosphinetetraacetic acid in solution

1985 ◽  
Vol 50 (2) ◽  
pp. 445-453 ◽  
Author(s):  
Jana Podlahová ◽  
Josef Šilha ◽  
Jaroslav Podlaha
Keyword(s):  
Metal Ion ◽  
Carboxyl Groups ◽  
Complex Solution ◽  
Square Planar ◽  
Weak Complexes ◽  
Carboxylic Groups ◽  
Uv Visible ◽  
The Stability ◽  
Tetrahedral Complexes ◽  
Free Carboxyl

Ethylenediphosphinetetraacetic acid is bonded to metal ions in aqueous solutions in four ways, depending on the type of metal ion: 1) through an ionic bond of the carboxylic groups to form weak complexes with a metal:ligand ratio of 1 : 1 (Ca(II), Mn(II), Zn(II), Pb(II), La(III)); 2) through type 1) bond with contributions from weak interaction with the phosphorus (Cd(II)); 3) through coordination of the ligand as a monodentate P-donor with the free carboxyl groups with formation of 2 : 1 and 1 : 1 complexes (Cu(I), Ag(I)); 4) through formation of square planar or, for Hg(II), tetrahedral complexes with a ratio of 1 : 2 with the ligand as a bidentate PP-donor with the free carboxyl groups (Fe(II), Co(II), Ni(II), Pd(II), Pt(II)). On acidification of the complex solution, the first two protons are bonded to the carboxyl groups. The behaviour during further protonation depends on the type of complex: in complexes of types 1) and 2) phosphorus is protonated and the complex dissociates; in complexes of types 3) and 4) the free carboxyl groups are protonated and the phosphorus-metal bond remains intact. The results are based on correlation of the stability constants, UV-visible, infrared, 1H and 31P NMR spectra and magnetic susceptibilities of the complexes in aqueous solution.

Synthesis and properties of a sterically encumbered poly(thienylene vinylene): poly[E-1,2-(4,4prime-dihexyl-2,2prime-dithienyl)ethylene]

1998 ◽  
Vol 76 (11) ◽  
pp. 1524-1529
Author(s):  
Jimmy Lowe ◽  
Carl Bartels ◽  
Steven Holdcroft
Keyword(s):  
Ftir Spectroscopy ◽  
Electrically Conducting ◽  
H Nmr ◽  
Visible Photoluminescence ◽  
Micron Size ◽  
Visible Irradiation ◽  
Uv Visible ◽  
The Stability ◽  
Doped Polymer ◽  
Polythiophene Derivative

Electrically conducting poly[E-1,2-(4,4prime-dihexyl-2,2prime-dithienyl)ethylene] was synthesized and structurally characterized by UV-visible, 1H NMR, and FTIR spectroscopy. The head-to-head arrangement of the alkylthiophene dyads directly affects the UV-visible, photoluminescence, and electroluminescence maxima of the polymer. The conductivity of the doped polymer was measured to be ~2 S cm-1 and the stability of the oxidized polymer possessing various dopants was compared. UV-visible irradiation of PDHDTE rendered the films insoluble and photolithography was used to produce micron-size images. FTIR was used to monitor the photoproducts during photolysis of PDHDTE. Mechanisms of photooxidation were proposed, based on the photoproducts observed.Key words: polythiophene derivative, head-to-head dyad, photolithography, photooxidation, electroluminescence.

scholarly journals Experimental Investigation on Stability, Viscosity, and Electrical Conductivity of Water-Based Hybrid Nanofluid of MWCNT-Fe2O3

Nanomaterials ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 136
Author(s):  
Solomon O. Giwa ◽  
Mohsen Sharifpur ◽  
Mohammad H. Ahmadi ◽  
S. M. Sohel Murshed ◽  
Josua P. Meyer
Keyword(s):  
Electrical Conductivity ◽  
Visual Inspection ◽  
Volume Concentration ◽  
Working Fluid ◽  
Hybrid Nanofluid ◽  
Multiwalled Carbon ◽  
Transmission Electron ◽  
Hybrid Nanofluids ◽  
Uv Visible ◽  
The Stability

The superiority of nanofluid over conventional working fluid has been well researched and proven. Newest on the horizon is the hybrid nanofluid currently being examined due to its improved thermal properties. This paper examined the viscosity and electrical conductivity of deionized water (DIW)-based multiwalled carbon nanotube (MWCNT)-Fe2O3 (20:80) nanofluids at temperatures and volume concentrations ranging from 15 °C to 55 °C and 0.1–1.5%, respectively. The morphology of the suspended hybrid nanofluids was characterized using a transmission electron microscope, and the stability was monitored using visual inspection, UV–visible, and viscosity-checking techniques. With the aid of a viscometer and electrical conductivity meter, the viscosity and electrical conductivity of the hybrid nanofluids were determined, respectively. The MWCNT-Fe2O3/DIW nanofluids were found to be stable and well suspended. Both the electrical conductivity and viscosity of the hybrid nanofluids were augmented with respect to increasing volume concentration. In contrast, the temperature rise was noticed to diminish the viscosity of the nanofluids, but it enhanced electrical conductivity. Maximum increments of 35.7% and 1676.4% were obtained for the viscosity and electrical conductivity of the hybrid nanofluids, respectively, when compared with the base fluid. The obtained results were observed to agree with previous studies in the literature. After fitting the obtained experimental data, high accuracy was achieved with the formulated correlations for estimating the electrical conductivity and viscosity. The examined hybrid nanofluid was noticed to possess a lesser viscosity in comparison with the mono-particle nanofluid of Fe2O3/water, which was good for engineering applications as the pumping power would be reduced.

Experimental study of the stability of aluminate-borate complexes in hydrothermal solutions 1 1Associate editor: L. G. Benning

2004 ◽  
Vol 68 (6) ◽  
pp. 1333-1345 ◽  
Author(s):  
Boris Tagirov ◽  
Jacques Schott ◽  
Jean-Claude Harrichoury ◽  
Jocelyne Escalier
Keyword(s):  
Experimental Study ◽  
Hydrothermal Solutions ◽  
Borate Complexes ◽  
The Stability

scholarly journals Novel phthalonitrile derivatives as potential compounds for extraction and complexation of metal cations

2016 ◽  
Vol 11 (10) ◽  
pp. 3870-3874
Author(s):  
Lassaad Baklouti
Keyword(s):  
Heavy Metal ◽  
Transition Metal ◽  
Metal Cations ◽  
Uv Spectra ◽  
Transition Metal Cations ◽  
Binding Properties ◽  
Heavy Metal Cations ◽  
Uv Visible ◽  
The Stability ◽  
Ligand Species

The synthesis and the binding properties of novel phthalonitrile derivatives 1-3 towards metal cations have been described in this paper. The complexation and extraction of some transition and heavy metal cations have been followed by UV-visible spectrophotometry absorption in methanol. The conductivity studies have been used in order to confirm complex’s stoichiometries. The treatment of UV spectra by digital program showed the formation of ML (with ML2 in some cases) (M=metal, L=ligand) species. Beyond the discussion of the stability profiles of complexes particular attention is paid to the selectivity towards Cu2+ in the 1st sequence of transition metal cations and towards Hg2+ in the sequence of heavy metal cations.

scholarly journals Shedding Light on Phase Stability and Surface Engineering of Formamidinium Lead Iodide (FaPbI3) Thin Films for Solar Cells

2021 ◽  
Vol 12 (1) ◽  
pp. 1
Author(s):  
Julia Marí-Guaita ◽  
Amal Bouich ◽  
Bernabé Marí
Keyword(s):  
Thin Films ◽  
Surface Engineering ◽  
Optical Analysis ◽  
X Ray Diffraction ◽  
Lead Iodide ◽  
X Ray ◽  
Structure Surface ◽  
Uv Visible ◽  
The Stability ◽  
Humidity Environment

In this work, FAPbI3 thin films with different antisolvents (toluene, diethyl ether and chlorobenzene) were successfully elaborated by the spin coating technique to study the influence of the different antisolvents in the films. The crystal structure, surface morphology and optical properties were characterized by X-ray diffraction (XRD), field-emission scanning electron microscopy (FESEM) photoluminescence and UV–visible spectrometry. According to XRD, the crystalline structure of FAPbI3 was found in the orientation of the (110) plane, and it is observed that the type of antisolvent content in the absorber layer plays an important role in the growth and stabilization of the film. Here, chlorobenzene leads to a smooth and homogenous surface, a large grain size and a pinhole-free perovskite film. Additionally, the optical analysis revealed that the band gap is in the range from 1.55 to 1.57 eV. Furthermore, in an approximately 60% humidity environment and after two weeks, the stability and absorption of FaPbI3 showed low degradation.

Effects of Ionic Strength and Charge Density on the Stability of Chloride Complexes of Trivalent Lanthanides

2008 ◽  
Vol 53 (8) ◽  
pp. 1756-1761 ◽  
Author(s):  
Edelmira Fernández-Ramírez ◽  
Melania Jiménez-Reyes ◽  
Marcos J. Solache-Ríos
Keyword(s):  
Ionic Strength ◽  
Charge Density ◽  
Chloride Complexes ◽  
Trivalent Lanthanides ◽  
The Stability

scholarly journals Synthesis and Spectral Studies of Some Bioactive Transition Metal Complexes of [bis-2-(4-Fluorophenyl)prop-2-enaln]ethane-1,2-diamine

2019 ◽  
Vol 31 (10) ◽  
pp. 2357-2360
Author(s):  
Jagvir Singh ◽  
Anuradha ◽  
Pradeep Kumar ◽  
Mordhwaj ◽  
Ravi Kumar
Keyword(s):  
Staphylococcus Aureus ◽  
Metal Complexes ◽  
Antimicrobial Properties ◽  
Analysis Data ◽  
Antimicrobial Activities ◽  
Spectral Studies ◽  
Elemental Analysis Data ◽  
Chloride Complexes ◽  
Elemental Analyses ◽  
Uv Visible

Co(II), Ni(II) and Cu(II) metal complexes of a novel Schiff base ligand (SBL) derived from condensation of 2-(4-fluorophenyl)prop-2-enaln and ethane-1,2-diamine were synthesized. All the complexes were characterized by elemental analyses, IR, UV-visible spectroscopy, magnetic susceptibility and conductance measurements and 1H NMR. From the elemental analysis data, 1:1 [M]:[ligand] metal chloride complexes are formed having the general composition [M(SBL)Cl2] and [Cu(SBL)] Cl2, [where M = Co(II), Ni(II) and SBL= {bis-2-(4-fluorophenyl)prop-2-enaln}ethane-1,2-diamine]. The result showed that the ligand is coordinated to the metal ions in a neutral tetradentate manner with ON donor sites and the nature of metal-ligand bonding can range from covalent to ionic. Antimicrobial activities of the newly synthesized chemical compounds were evaluated against Staphylococcus aureus (ATCC 25923), Staphylococcus aureus (ATCC 3160), Cabdida albicans (ATCC 227) and Staphylococcus cereviscae (ATCC 361) species and found that metal complexes exhibited more antimicrobial properties so they are more potential and significant than the ligand.

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