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Two modified Zagreb indices for random structures 随机结构的两个改进Zagreb指数
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2021-01-01 DOI: 10.1515/mgmc-2021-0013
Siman Li, Li Shi, Wei Gao
{"title":"Two modified Zagreb indices for random structures","authors":"Siman Li, Li Shi, Wei Gao","doi":"10.1515/mgmc-2021-0013","DOIUrl":"https://doi.org/10.1515/mgmc-2021-0013","url":null,"abstract":"Abstract Random structure plays an important role in the composition of compounds, and topological index is an important index to measure indirectly the properties of compounds. The Zagreb indices and its revised versions (or redefined versions) are frequently used chemical topological indices, which provide the theoretical basis for the determination of various physical-chemical properties of compounds. This article uses the tricks of probability theory to determine the reduced second Zagreb index and hyper-Zagreb index of two kinds of vital random graphs: G(n, p) and G(n, m).","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"44 1","pages":"150 - 156"},"PeriodicalIF":1.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2021-0013","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43776927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 7
Variable combinations of organophosphines in PtP3X derivatives: Structural aspects PtP3X衍生物中有机膦的可变组合:结构方面
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2021-01-01 DOI: 10.1515/mgmc-2021-0003
M. Melnik, P. Mikuš
{"title":"Variable combinations of organophosphines in PtP3X derivatives: Structural aspects","authors":"M. Melnik, P. Mikuš","doi":"10.1515/mgmc-2021-0003","DOIUrl":"https://doi.org/10.1515/mgmc-2021-0003","url":null,"abstract":"Abstract This review covers over fifty Pt (II) complexes of the compositions PtP3X (X = H, OL, NL, BL, Cl, SL, Br, or I). These complexes crystallized in three crystal classes: monoclinic (23 examples) triclinic (17 examples) and orthorhombic (11 examples). The PtP3Cl is most common with 23 examples. There are variable combinations of organophosphines monodentate – P; bidentate- P,P; P,N; P,B; and tridentate – P,P,P; P,O,P; P,N,P; and P,S,P. The structural parameters (Pt–L, L–Pt–L) are analyzed and discussed with an attention to the distortion of a square-planar geometry about the Pt (II) atoms as well as of trans-influence. The sums of Pt–L (x4) bond distances growing with covalent radius of the X-atoms.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"44 1","pages":"12 - 21"},"PeriodicalIF":1.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2021-0003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67036054","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
X-ray crystal structures of carbonate and hydroxide bridged MnII/MgII heterobimetallic complexes formed by reduction of CO2 or H2O by a Mn0–MgII bonded compound 碳酸盐和氢氧化物桥接MnII/MgII杂双金属配合物由Mn0-MgII键合化合物还原CO2或H2O形成的x射线晶体结构
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2021-01-01 DOI: 10.1515/mgmc-2021-0027
Jamie Hicks, M. Juckel, Cameron Jones
{"title":"X-ray crystal structures of carbonate and hydroxide bridged MnII/MgII heterobimetallic complexes formed by reduction of CO2 or H2O by a Mn0–MgII bonded compound","authors":"Jamie Hicks, M. Juckel, Cameron Jones","doi":"10.1515/mgmc-2021-0027","DOIUrl":"https://doi.org/10.1515/mgmc-2021-0027","url":null,"abstract":"Abstract The previously reported Mn0–MgII bonded heterobimetallic compound [L†Mn–Mg(MesNacnac)] (L† = −N(Ar†)(SiPri3), Ar† = C6H2{C(H)Ph2}2Pri-2,6,4; MesNacnac = [(MesNCMe)2CH]−; Mes = mesityl) forms an adduct complex, [L†Mn–Mg(THF)(MesNacnac)], when dissolved in THF. Adventitious water is shown to be reduced by [L†Mn–Mg(MesNacnac)] to give the hydroxide bridged heterobimetallic, [L†Mn(μ-OH)2Mg(MesNacnac)]. The Mn0–MgII bonded heterobimtallic reductively disproportionates CO2, affording the carbonate bridged species, [{L†Mn(μ-CO3)Mg(THF) (MesNacnac)}2], in the presence of THF. The three new compounds have been crystallographically characterized.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"44 1","pages":"250 - 255"},"PeriodicalIF":1.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47196364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Syntheses and molecular structures of some di(amidino)monosilanes 一些二氨基单硅烷的合成及其分子结构
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2021-01-01 DOI: 10.1515/mgmc-2021-0024
Markus Bös, Marcus Herbig, U. Böhme, E. Kroke
{"title":"Syntheses and molecular structures of some di(amidino)monosilanes","authors":"Markus Bös, Marcus Herbig, U. Böhme, E. Kroke","doi":"10.1515/mgmc-2021-0024","DOIUrl":"https://doi.org/10.1515/mgmc-2021-0024","url":null,"abstract":"Abstract The syntheses of three different amidinosilanes of the type Me2Si[N=C(Ph)R]2 with R = pyrrolidino, morpholino, and diethylamino and one derivative with the composition R2Si[N=C(Ph)R]2 with R = morpholino are reported. These compounds were prepared in one-pot syntheses including three consecutive steps. All products are analysed by single crystal X-ray diffraction, NMR, and Raman spectroscopy. The Si–N=C–N units of these compounds show characteristic structural features and cause a significant high field shift of the 29Si NMR signals.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"44 1","pages":"228 - 238"},"PeriodicalIF":1.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43118124","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
On topological descriptors of ceria oxide and their applications 氧化铈的拓扑描述符及其应用
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2021-01-01 DOI: 10.1515/mgmc-2021-0015
M. K. Siddiqui, Y. Chu, Muhammad Nasir, M. Nadeem, M. Hanif
{"title":"On topological descriptors of ceria oxide and their applications","authors":"M. K. Siddiqui, Y. Chu, Muhammad Nasir, M. Nadeem, M. Hanif","doi":"10.1515/mgmc-2021-0015","DOIUrl":"https://doi.org/10.1515/mgmc-2021-0015","url":null,"abstract":"Abstract A topological descriptor is a mathematical illustration of a molecular construction that relates particular physicochemical properties of primary molecular structure as well its mathematical depiction. Topological co-indices are usually applied for quantitative structure actions relationships (QSAR) and quantitative structures property relationships (QSPR). Topological co-indices are topological descriptors which are considered the noncontiguous vertex set. We study the accompanying some renowned topological co-indices: first and second Zagreb co-indices, first and second multiplicative Zagreb co-indices and the F-coindex, and some other degree-based indices of the co-indices of ceria oxide.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"44 1","pages":"103 - 116"},"PeriodicalIF":1.8,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2021-0015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41989506","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 13
Occupational exposure in lead and zinc mines induces oxidative stress in miners lymphocytes: Role of mitochondrial/lysosomal damage 铅和锌矿山的职业暴露诱导矿工淋巴细胞的氧化应激：线粒体/溶酶体损伤的作用
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2020-01-01 DOI: 10.1515/mgmc-2020-0019
Enayatollah Seydi, Mahshid Soltani, M. Ramazani, M. Zarei, J. Pourahmad
{"title":"Occupational exposure in lead and zinc mines induces oxidative stress in miners lymphocytes: Role of mitochondrial/lysosomal damage","authors":"Enayatollah Seydi, Mahshid Soltani, M. Ramazani, M. Zarei, J. Pourahmad","doi":"10.1515/mgmc-2020-0019","DOIUrl":"https://doi.org/10.1515/mgmc-2020-0019","url":null,"abstract":"Abstract The purpose of this research was to determine mitochondrial and lysosomal damage and oxidative stress status in blood lymphocytes of lead-zinc miners. This research was performed in 10 mine workers who have been in contact with lead and zinc in comparison to a control group containing 10 healthy volunteers. Lymphocytes were isolated from peripheral blood using the Ficoll standard method and then mitochondrial and lysosomal damage and oxidative stress were evaluated. The level of reactive oxygen species (ROS), collapse in the mitochondrial membrane potential (MMP) collapse, and glutathione disulfide (GSSG) content, and lysosomal damage in miners were higher than the control group. Also, viability and glutathione (GSH) content were decreased. The lymphocytes of workers of a lead-zinc mine are more susceptible to oxidative stress, mitochondrial and lysosomal damage. The proper use of safety equipment can reduce the risk of toxic agents and their subsequent hazards for mine workers.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"43 1","pages":"154 - 163"},"PeriodicalIF":1.8,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2020-0019","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41569738","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Assessment of content and chemical forms of arsenic, copper, lead, and chromium in sewage sludge compost as affected by various bulking agents 不同膨松剂对污泥堆肥中砷、铜、铅和铬含量和化学形态影响的评估
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2020-01-01 DOI: 10.1515/mgmc-2020-0006
Mahboub Saffari, V. Saffari, Hojatollah Khabazzadeh, H. Naghavi
{"title":"Assessment of content and chemical forms of arsenic, copper, lead, and chromium in sewage sludge compost as affected by various bulking agents","authors":"Mahboub Saffari, V. Saffari, Hojatollah Khabazzadeh, H. Naghavi","doi":"10.1515/mgmc-2020-0006","DOIUrl":"https://doi.org/10.1515/mgmc-2020-0006","url":null,"abstract":"Abstract In current study, the effect of various organic substances as bulking agents (BAs) including wheat straw, pistachio hull wastes, and tree leaves at different levels (10, 25, 45% v/v) were investigated on total concentration and chemical forms of Cu, Pb, Cr, and As in sewage sludge (SS) compost prepared by windrow method. According to the results, the composting process (with/without BAs), due to losses of SS mass and volume, increased the total concentration of heavy metals (HMs) compared to the un-composted SS sample (RSS). Evaluation of HMs chemical forms in prepared compost sample without BAs application (CSS) showed that the composting process reduced the mobility factor of As (from 28% to 20%), Pb (from 11.6% to 9.3%), and Cr (from 14.5% to 9.2%) compared to the RSS. Application of three BAs considerably decreased the mobility factor of As (17.5-18.8%), Pb (4.8-7.9%), and Cr (1.4-6.8%) compared to CSS and RSS. Changes of Cu mobility in prepared compost samples showed an unclear trend, however in some treatments, due to transferred organic fraction into exchangeable and carbonate fractions, increasing of this factor was obvious. Generally, the composting appeared to reduce As, Pb, and Cr availability by stabilizing the three metals and making them more stable and less mobile. In addition, the BAs application effect on HMs behavior of SS compost samples were so different and no specific kind of BAs can be recommended as a superior BAs in SS composting process.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"43 1","pages":"56 - 66"},"PeriodicalIF":1.8,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2020-0006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47608189","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 8
Modified Zagreb connection indices of the T-sum graphs 修改了t和图的Zagreb连接指数
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2020-01-01 DOI: 10.1515/mgmc-2020-0005
Usman Ali, M. Javaid, Agha Kashif
{"title":"Modified Zagreb connection indices of the T-sum graphs","authors":"Usman Ali, M. Javaid, Agha Kashif","doi":"10.1515/mgmc-2020-0005","DOIUrl":"https://doi.org/10.1515/mgmc-2020-0005","url":null,"abstract":"Abstract The quantitative structures activity relationships (QSAR) and quantitative structures property relationships (QSPR) between the chemical compounds are studied with the help of topological indices (TI’s) which are the fixed real numbers directly linked with the molecular graphs. Gutman and Trinajstic (1972) defined the first degree based TI to measure the total π-electrone energy of a molecular graph. Recently, Ali and Trinajstic (2018) restudied the connection based TI’s such as first Zagreb connection index, second Zagreb connection index and modified first Zagreb connection index to find entropy and accentric factor of the octane isomers. In this paper, we study the modified second Zagreb connection index and modified third Zagreb connection index on the T-sum (molecular) graphs obtained by the operations of subdivision and product on two graphs. At the end, as the applications of the obtained results for the modified Zagreb connection indices of the T-sum graphs of the particular classes of alkanes are also included. Mainly, a comparision among the Zagreb indices, Zagreb connection indices and modified Zagreb connection indices of the T-sum graphs of the particular classes of alkanes is performed with the help of numerical tables, 3D plots and line graphs using the statistical tools.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"43 1","pages":"43 - 55"},"PeriodicalIF":1.8,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2020-0005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42264780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 25
Green synthesis and characterization of hexaferrite strontium-perovskite strontium photocatalyst nanocomposites 六铁氧体锶-钙钛矿锶光催化剂纳米复合材料的绿色合成与表征
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2020-01-01 DOI: 10.1515/mgmc-2020-0004
Zahra Hajian Karahroudi, K. Hedayati, M. Goodarzi
{"title":"Green synthesis and characterization of hexaferrite strontium-perovskite strontium photocatalyst nanocomposites","authors":"Zahra Hajian Karahroudi, K. Hedayati, M. Goodarzi","doi":"10.1515/mgmc-2020-0004","DOIUrl":"https://doi.org/10.1515/mgmc-2020-0004","url":null,"abstract":"Abstract This study presents a preparation of SrFe12O19– SrTiO3 nanocomposite synthesis via the green auto-combustion method. At first, SrFe12O19 nanoparticles were synthesized as a core and then, SrTiO3 nanoparticles were prepared as a shell for it to manufacture SrFe12O19–SrTiO3 nanocomposite. A novel sol-gel auto-combustion green synthesis method has been used with lemon juice as a capping agent. The prepared SrFe12O19–SrTiO3 nanocomposites were characterized by using several techniques to characterize their structural, morphological and magnetic properties. The crystal structures of the nanocomposite were investigated via X-ray diffraction (XRD). The morphology of SrFe12O19– SrTiO3 nanocomposite was studied by using a scanning electron microscope (SEM). The elemental composition of the materials was analyzed by an energy-dispersive X-ray (EDX). Magnetic properties and hysteresis loop of nanopowder were characterized via vibrating sample magnetometer (VSM) in the room temperature. Fourier transform infrared spectroscopy (FTIR) spectra of the samples showed the molecular bands of nanoparticles. Also, the photocatalytic behavior of nanocomposites has been checked by the degradation of azo dyes under irradiation of ultraviolet light.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"43 1","pages":"26 - 42"},"PeriodicalIF":1.8,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2020-0004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46735792","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 26
fac-Bis(phenoxatellurine) tricarbonyl manganese(I) bromide fac-双（苯并碲）三羰基溴化锰（I）
IF 1.8 3区 化学
Main Group Metal Chemistry Pub Date : 2020-01-01 DOI: 10.1515/mgmc-2020-0022
Farzin Mostaghimi, E. Lork, J. Beckmann
{"title":"fac-Bis(phenoxatellurine) tricarbonyl manganese(I) bromide","authors":"Farzin Mostaghimi, E. Lork, J. Beckmann","doi":"10.1515/mgmc-2020-0022","DOIUrl":"https://doi.org/10.1515/mgmc-2020-0022","url":null,"abstract":"Abstract The reaction of (CO)5MnBr with phenoxatellurine (PT) provided the octahedral complex fac-(CO)3(PT)2MnBr in which the two PT ligands are situated in cis-position.","PeriodicalId":48891,"journal":{"name":"Main Group Metal Chemistry","volume":"43 1","pages":"181 - 183"},"PeriodicalIF":1.8,"publicationDate":"2020-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/mgmc-2020-0022","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48563814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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