The Experts below are selected from a list of 123 Experts worldwide ranked by ideXlab platform
Armando J L Pombeiro - One of the best experts on this subject based on the ideXlab platform.
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Syntheses, Structures, and Catalytic Hydrocarbon Oxidation Properties of N-Heterocycle-Sulfonated Schiff Base Copper(II) Complexes
MDPI AG, 2019Co-Authors: Susanta Hazra, Fatima Guedes M C Da Silva, Anirban Karmakar, Bruno G. M. Rocha, Armando J L PombeiroAbstract:Reaction of the o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H2L) (1) with CuCl2·2H2O in the presence of pyridine (py) leads to [Cu(L)(py)(EtOH)] (2) which, upon further reaction with 2,2’-bipyridine (bipy), pyrazine (pyr), or piperazine (pip), forms [Cu(L)(bipy)]·MeOH (3), [Cu2(L)2(μ-pyr)(MeOH)2] (4), or [Cu2(L)2(μ-pip)(MeOH)2] (5), respectively. The Schiff base (1) and the metal complexes (2⁻5) are stabilized by a number of non-covalent interactions to form interesting H-bonded multidimensional polymeric networks (except 3), such as zigzag 1D chain (in 1), linear 1D chain (in 2), Hacksaw double chain 1D (in 4) and 2D motifs (in 5). These copper(II) complexes (2⁻5) catalyze the peroxidative oxidation of cyclic hydrocarbons (cyclooctane, cyclohexane, and cyclohexene) to the corresponding products (alcohol and ketone from alkane; alcohols, ketone, and epoxide from alkene), under mild conditions. For the oxidation of cyclooctane with hydrogen peroxide as oxidant, used as a model reaction, the best yields were generally achieved for complex 3 in the absence of any promoter (20%) or in the presence of py or HNO3 (26% or 30%, respectively), whereas 2 displayed the highest catalytic activity in the presence of HNO3 (35%). While the catalytic reactions were significantly faster with py, the best product yields were achieved with the acidic additive
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1d Hacksaw chain bipyridine sulfonate schiff base dicopper ii as a host for variable solvent guests
RSC Advances, 2015Co-Authors: Susanta Hazra, Fatima Guedes M C Da Silva, Anirban Karmakar, Armando J L PombeiroAbstract:Syntheses, crystal structures and interconversion properties of the 1D coordination polymers [Cu2L2(bipy)]n·2nMe2SO (1), [Cu2L2(bipy)]n·3nNH2CHO·nH2O (2), [Cu2L2(bipy)]n·2nNH(Me)CHO (3), [Cu2L2(bipy)]n·2nN(Me)2CHO (4) and [Cu2L2(bipy)]n·2nMeOH (5) (bipy = 4,4′-bipyridine) derived from the acyclic Schiff base o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H2L) are described. Single-crystal X-ray diffraction analyses revealed their solvatomorph properties, featuring the formation of 1D polymeric chains with identical Hacksaw patterns and adaptable host abilities, containing different guest solvent molecules. No amorphicity was detected upon desolvation of 1–5 and of the previously reported compound [Cu2L2(bipy)]n·nN(Me)2CHO (6), and these coordination polymers undergo reversible interconversion.
Susanta Hazra - One of the best experts on this subject based on the ideXlab platform.
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Syntheses, Structures, and Catalytic Hydrocarbon Oxidation Properties of N-Heterocycle-Sulfonated Schiff Base Copper(II) Complexes
MDPI AG, 2019Co-Authors: Susanta Hazra, Fatima Guedes M C Da Silva, Anirban Karmakar, Bruno G. M. Rocha, Armando J L PombeiroAbstract:Reaction of the o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H2L) (1) with CuCl2·2H2O in the presence of pyridine (py) leads to [Cu(L)(py)(EtOH)] (2) which, upon further reaction with 2,2’-bipyridine (bipy), pyrazine (pyr), or piperazine (pip), forms [Cu(L)(bipy)]·MeOH (3), [Cu2(L)2(μ-pyr)(MeOH)2] (4), or [Cu2(L)2(μ-pip)(MeOH)2] (5), respectively. The Schiff base (1) and the metal complexes (2⁻5) are stabilized by a number of non-covalent interactions to form interesting H-bonded multidimensional polymeric networks (except 3), such as zigzag 1D chain (in 1), linear 1D chain (in 2), Hacksaw double chain 1D (in 4) and 2D motifs (in 5). These copper(II) complexes (2⁻5) catalyze the peroxidative oxidation of cyclic hydrocarbons (cyclooctane, cyclohexane, and cyclohexene) to the corresponding products (alcohol and ketone from alkane; alcohols, ketone, and epoxide from alkene), under mild conditions. For the oxidation of cyclooctane with hydrogen peroxide as oxidant, used as a model reaction, the best yields were generally achieved for complex 3 in the absence of any promoter (20%) or in the presence of py or HNO3 (26% or 30%, respectively), whereas 2 displayed the highest catalytic activity in the presence of HNO3 (35%). While the catalytic reactions were significantly faster with py, the best product yields were achieved with the acidic additive
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1d Hacksaw chain bipyridine sulfonate schiff base dicopper ii as a host for variable solvent guests
RSC Advances, 2015Co-Authors: Susanta Hazra, Fatima Guedes M C Da Silva, Anirban Karmakar, Armando J L PombeiroAbstract:Syntheses, crystal structures and interconversion properties of the 1D coordination polymers [Cu2L2(bipy)]n·2nMe2SO (1), [Cu2L2(bipy)]n·3nNH2CHO·nH2O (2), [Cu2L2(bipy)]n·2nNH(Me)CHO (3), [Cu2L2(bipy)]n·2nN(Me)2CHO (4) and [Cu2L2(bipy)]n·2nMeOH (5) (bipy = 4,4′-bipyridine) derived from the acyclic Schiff base o-[(o-hydroxyphenyl)methylideneamino]benzenesulfonic acid (H2L) are described. Single-crystal X-ray diffraction analyses revealed their solvatomorph properties, featuring the formation of 1D polymeric chains with identical Hacksaw patterns and adaptable host abilities, containing different guest solvent molecules. No amorphicity was detected upon desolvation of 1–5 and of the previously reported compound [Cu2L2(bipy)]n·nN(Me)2CHO (6), and these coordination polymers undergo reversible interconversion.
Liu Nian-hong - One of the best experts on this subject based on the ideXlab platform.
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Study on bimetal Hacksaw blades industry in China
Technological Development of Enterprise, 2010Co-Authors: Liu Nian-hongAbstract:Bimetal Hacksaw blades have features of high cutting precision,low material loss and high work efficiency.Invention of bimetal Hacksaw blades is seen as "revolution of cutting technology" in metal cutting domain.This article introduced capacity of global and internal bimetal Hacksaw blades market.
B Shubham - One of the best experts on this subject based on the ideXlab platform.
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fabrication of single drive four way Hacksaw machine
International Journal of Research, 2018Co-Authors: N Ashwin, Mohd Haris, D Rizwan, K Rizwan, B ShubhamAbstract:There are many industrial applications where round bar or square bars are required to be operated on different machines to make machine components such as Shafts, Bolts, Screws etc. This needs more and more number of pieces to be cut for mass production of those components. To achieve this goal the 4-way Hacksaw machine is developed. This paper proposes the model of 4-way Hacksaw machine which is able to cut four pieces simultaneously without any jerk and minimum vibrations. The model implies conversion of rotary motion into the reciprocating motion for proper working of Hacksaw. This model overcomes the limitations of conventional Hacksaw machines which can cut single piece at a time. It is able to cut bars of different materials at same time and will be helpful in many industries due its compatibility, reliability and efficiency. An AC motor is used to bring about the reciprocating motion required for cutting the work-pieces. There is a self-weight attached with the reciprocating mechanism to provide the necessary downward force required for penetration of Hacksaw blade in to the work-piece.
Norbert Telmon - One of the best experts on this subject based on the ideXlab platform.
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epifluorescence analysis of Hacksaw marks on bone highlighting unique individual characteristics
Forensic Science International, 2014Co-Authors: Caroline Capuani, Celine Guilbeaufrugier, Marie Bernadette Delisle, D Rouge, Norbert TelmonAbstract:Analysis of dismemberment trauma aims at identifying characteristics of false starts and complete sections in order to identify the class of saw. Nevertheless, determination of the individual weapon remains a challenging task. We attempted to determine the unique characteristics of different blades within the same class of saws using epifluorescence macroscopy, a non-invasive technique, in order to establish an individual injury profile. Two Hacksaw blades of identical characteristics (size, set and shape of the teeth) were used to create false starts and complete sections on partially defleshed pig bones. These wounds were then analyzed using epifluorescence macroscopy. Bone lesion analysis determined characteristics that were common to both blades, corresponding to size, raker set and ripcut shape. The data collected made it possible to reconstruct the trauma. Furthermore, we highlighted specific characteristics of each blade in both false starts and complete sections. These characteristics mainly related to the shape and profile of the kerf, the consistency of cut and type of fluorescent wall striations. The sum of the information collected in examination of dismemberment wounds can identify, through comparative analysis, the individual weapon responsible for the imprints observed on the bones.
