scholarly journals Magnetic, spectrochemical and thermal properties of the 2-chloro-5-nitrobenzoates of Co(II), Ni(II) and Cu(II)

2006 ◽  
Vol 71 (8-9) ◽  
pp. 929-937 ◽  
Author(s):  
Wiesława Ferenc ◽  
Agnieszka Walków-Dziewulska ◽  
Beata Cristóvão ◽  
Jan Sarzyñski
Keyword(s):  
Thermal Decomposition ◽  
Thermal Properties ◽  
Metal Ion ◽  
Chemical Properties ◽  
Water Molecules ◽  
Dehydration Process ◽  
Crystallization Water ◽  
Physico Chemical ◽  
One Step ◽  
Hydrated Complexes

Some physico-chemical properties of the 2-chloro-5-nitrobenzoates of Co(II) Ni(II) and Cu(II) were studied. The complexes were obtained as hydrates with a metal ion to ligand ratio of 1:2. All the complexes were polycrystalline compounds. Their colors depended on the nature of the central ion: pink for the Co(II) complex, green for the Ni(II) and blue for the Cu(II) compounds. Their thermal decomposition was studied in the range of 293-523 K because it was found that the 2-chloro-5-nitrobenzoates decomposed explosively on heating in air above 523 K. The hydrated complexes lost crystallization water molecules in one step. From the results, it appeared that no transformation of the nitro group to nitrite occurred during the dehydration process. Their solubilities in water at 293 K were of the order of 10-2 mol dm-3 for the Ni(II) and Co(II) complexes and 10-4 mol dm-3 for that of Cu(II). The magnetic moment values of Co2+, Ni2+ and Cu2+ in the 2-chloro-5-nitrobenzoates, experimentally determined in the range, of 76-303 K ranged from 3.48 to 3.82 ?B for Co(II), from 2.69 to 3.08 ?B for the Ni(II) and from 1.87 to 2.00 ?B for the Cu(II) complex. The 2-chloro-5-nitrobenzoates of Co(II), Ni(II) and Cu(II) followed the Curie-Weiss law.

Magnetic, spectral, and thermal behaviour of 2-chloro-4-nitrobenzoates of Co(II), Ni(II), and Cu(II)

2006 ◽  
Vol 60 (3) ◽  
Author(s):  
W. Ferenc ◽  
B. Cristóvão ◽  
B. Mazurek ◽  
J. Sarzyński
Keyword(s):  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Nitro Group ◽  
Magnetic Moment ◽  
Metal Ion ◽  
Water Molecules ◽  
Dehydration Process ◽  
Crystallization Water ◽  
One Step ◽  
Hydrated Complexes

AbstractSome physicochemical properties of 2-chloro-4-nitrobenzoates of Co(II), Ni(II), and Cu(II) were studied. The complexes were obtained as mono-and dihydrates with a metal ion—ligand mole ratio of 1: 2. All complexes are polycrystalline compounds. Their colours depend on the kind of central ion: pink for Co(II) complex, green for Ni(II), and blue for Cu(II) complexes. Their thermal decomposition was studied only in the range of 293 K–523 K because it was found that on heating in air above 523 K 2-chloro-4-nitrobenzoates decompose explosively. Hydrated complexes lose crystallization water molecules in one step. During dehydration process no transformation of the nitro group to nitrito one took place. Their solubilities in water at 293 K are of the orders of 10−3-10−2 mol dm−3. The magnetic moment values of 2-chloro-4-nitrobenzoates determined in the range of 76 K–303 K change from 3.48µB to 3.82µB for Co(II) complex, from 2.24µB to 2.83µB for Ni(II) 2-chloro-4-nitrobenzoate, and from 0.31µB to 1.41µB for Cu(II) complex. 2-Chloro-4-nitrobenzoates of Co(II) and Ni(II) follow the Curie—Weiss law, but the complex of Cu(II) forms dimer.

Electron Transport in Boron-Rich Borides

1987 ◽  
Vol 97 ◽  
Author(s):  
O. A. Golikova
Keyword(s):  
Thermal Properties ◽  
Electron Transport ◽  
Chemical Properties ◽  
Amorphous Semiconductors ◽  
Physico Chemical

Boron-rich borides represent a class of unique semiconductors. They combine the physico-chemical properties of refractory crystals with the electrical, optical, thermal properties typical for amorphous semiconductors [ 1–3 ].

Polynomials of Degree-Based Indices of Metal-Organic Networks

2020 ◽  
Vol 23 ◽  
Author(s):  
Ali Ahmad ◽  
Muhammad Ahsan Asim ◽  
Muhammad Faisal Nadeem
Keyword(s):  
Metal Ion ◽  
Chemical Properties ◽  
Molecular Structures ◽  
Topological Descriptors ◽  
Molecular Compound ◽  
Super Capacitor ◽  
Physico Chemical ◽  
Metal Organic ◽  
Carbon Based ◽  
Organic Networks

Aim and Objective: Metal-organic network (MON) is a special class of molecular compounds comprising of groups or metal ion and carbon-based ligand. These chemical compounds are examined employing one, two- or threedimensional formation of porous ore and subfamilies of polymers. Metal-organic networks are frequently utilized in catalysis for the parting & distillation of different gases and by means of conducting solid or super-capacitor. In various scenarios, the compounds are observed balanced in the procedure of deletion or diluter of the molecule and can be rebuilt with another molecular compound. The physical solidity and mechanical characteristics of the metal-organic network have attained great attention due to the mention properties. This study was undertaken to find the polynomials of MON. Methods: Topological descriptor is a numerical number that is utilized to predict the natural correlation amongst the physico-chemical properties of the molecular structures in their elementary networks. Results: After partitioning the vertices based on their degrees, we calculate different degree-based topological polynomials for two distinct metal-organic networks with an escalating number of layers containing both metals and carbon-based ligand vertices. Conclusion: In the analysis of the metal-organic network, topological descriptors and their polynomials play an important part in modern chemistry. An analysis between the calculated various forms of the polynomials and topological descriptors through the numeric values and their graphs is also comprised.

scholarly journals Complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand formed by condensation reaction of isatin with glutamic acid

2020 ◽  
Vol 45 (3) ◽  
pp. 12-27
Author(s):  
Wiesława Ferenc ◽  
Dariusz Osypiuk ◽  
Jan Sarzyński ◽  
Halina Głuchowska
Keyword(s):  
Glutamic Acid ◽  
Metal Ion ◽  
Magnetic Measurements ◽  
Condensation Reaction ◽  
Chemical Properties ◽  
Ligand Field ◽  
Decomposition Products ◽  
Carboxylate Groups ◽  
Physico Chemical ◽  
Crystalline Forms

The complexes of Mn(II), Co(II), Ni(II), Cu(II) and Zn(II) with ligand (H2L=C13H12N2O5) formed by condensation reaction of isatin and glutamic acid were synthesized. Their physico-chemical properties were characterized using elemental analysis, XRF, XRD, FTIR, TG–DSC and TG–FTIR methods and magnetic measurements (Gouy’s and SQUID-VSM methods). The complexes were obtained in crystalline forms (monoclinic or triclinic) with the formulae: M(LH)2·nH2O for Mn(II), Ni(II) and Zn(II) and ML·nH2O for Co(II) and Cu(II), where LH=C13H11N2O5–, L-=C13H10N2O52–, n = 1 for Mn(II), Cu(II) and Zn(II), n = 2 for Co(II) and n = 3 for Ni(II). In air at 293–1173 K they decompose in three steps forming finally the oxides of the appropriate metals. The gaseous decomposition products were identified as: H2O, CO2, CO, hydrocarbons and N2O. The magnetic moment values for complexes (except Zn(II) complex) show their paramagnetic properties with the ferro- and antiferromagnetic interactions between central ions. The compounds of Mn(II) and Co(II) are high spin complexes with weak ligand field. In Co(II) and Cu(II) complexes two carboxylate groups take part in the metal ion coordination while in those of Mn(II), Ni(II) and Zn(II) only one carboxylate anion coordinates to central ion.

Nanostructures of Water Molecules in Iteratively Filtered Water

2011 ◽  
Vol 495 ◽  
pp. 37-40 ◽  
Author(s):  
Vittorio Elia ◽  
Elena Napoli
Keyword(s):  
Electrical Conductivity ◽  
Chemical Properties ◽  
Dissipative Structures ◽  
Living Systems ◽  
Water Molecules ◽  
Distilled Water ◽  
Main Ingredient ◽  
Structure Of Water ◽  
Physico Chemical

This work presents some experimental results on the variation of the physico-chemical properties of pure, twice distilled water, when subject to a procedure of iterative filtrations through Pyrex glass filters (Büchner funnels). The study involves the determination of electrical conductivity. After the filtrations, electrical conductivity increases three times. Part of those increases, about 10-30%, is to be attributed to impurities released by the glass filters. The hypothesis is that the remaining 70-90% of the increases comes from variations in the super-molecular structure of water. The iterative filtration procedure involves a flux of energy and material in an open system. The energy flux is partially dissipated as heat permitting the formation of “dissipative structures”. Water, the main ingredient of living systems, exhibits an extraordinary auto-organization potentiality triggered by several kinds of perturbations, including mechanical ones.

scholarly journals Concentration and Quantification of SARS-CoV-2 RNA in Wastewater Using Polyethylene Glycol-Based Concentration and qRT-PCR

2021 ◽  
Vol 4 (1) ◽  
pp. 17
Author(s):  
Kata Farkas ◽  
Luke S. Hillary ◽  
Jamie Thorpe ◽  
David I. Walker ◽  
James A. Lowther ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Simple Procedure ◽  
Rna Extraction ◽  
Chemical Properties ◽  
Qrt Pcr ◽  
Reverse Transcription Pcr ◽  
Concentration Method ◽  
Physico Chemical ◽  
One Step ◽  
Wastewater Samples

Wastewater-based epidemiology has become an important tool for the surveillance of SARS-CoV-2 outbreaks. However, the detection of viruses in sewage is challenging and to date there is no standard method available which has been validated for the sensitive detection of SARS-CoV-2. In this paper, we describe a simple concentration method based on polyethylene glycol (PEG) precipitation, followed by RNA extraction and a one-step quantitative reverse transcription PCR (qRT-PCR) for viral detection in wastewater. PEG-based concentration of viruses is a simple procedure which is not limited by the availability of expensive equipment and has reduced risk of disruption to consumable supply chains. The concentration and RNA extraction steps enable 900–1500× concentration of wastewater samples and sufficiently eliminates the majority of organic matter, which could inhibit the subsequent qRT-PCR assay. Due to the high variation in the physico-chemical properties of wastewater samples, we recommend the use of process control viruses to determine the efficiency of each step. This procedure enables the concentration and the extraction the DNA/RNA of different viruses and hence can be used for the surveillance of different viral targets for the comprehensive assessment of viral diseases in a community.

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