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Croatica Chemica Acta最新文献

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Comparison of Radon Adsorption on Hematite and Charcoal Activated Powder in Air 空气中赤铁矿粉与活性炭粉吸附氡的比较
4区 化学
Croatica Chemica Acta Pub Date : 2023-01-01 DOI: 10.5562/cca4013
Vanja Radolić, Goran Šmit, Igor Miklavčić, Marina Poje Sovilj
{"title":"Comparison of Radon Adsorption on Hematite and Charcoal Activated Powder in Air","authors":"Vanja Radolić, Goran Šmit, Igor Miklavčić, Marina Poje Sovilj","doi":"10.5562/cca4013","DOIUrl":"https://doi.org/10.5562/cca4013","url":null,"abstract":": Adsorption of radon in the air was investigated on hematite, α -Fe 2 O 3 , and charcoal activated powder. Hematite had almost doubled efficiency in comparison to charcoal activated powder in the same experimental conditions but over a significantly longer per iod. Adsorption isotherms revealed a typical Langmuir shape on hematite and almost linear on activated charcoal. Linear models of Langmuir, Freundlich and Dubinin-Radushkevich isotherms showed that radon adsorption on both adsorbents is a favourable chemical process, with stronger interactions on hematite, that takes place forming a monolayer of ads orbed radon. The kinetic analysis confirmed forming of a monolayer on both adsorbents and two rate-controlling steps during radon adsorption on hematite, instead of one on activated charcoal, which could be considered as a reason of slower rate of process on hematite .","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135448259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Spectrophotometric Determination of N-acetyl-L-Cysteine in Pharmaceutical Formulations by Flow Injection and Sequential Injection Analysis: Comparison of the Methods 流动注射与序贯注射分光光度法测定制剂中n -乙酰- l-半胱氨酸的比较
4区 化学
Croatica Chemica Acta Pub Date : 2023-01-01 DOI: 10.5562/cca4016
Maja Biocic, Deni Karabatić, Dea Tomić, Lea Kukoc-Modun
{"title":"Spectrophotometric Determination of N-acetyl-L-Cysteine in Pharmaceutical Formulations by Flow Injection and Sequential Injection Analysis: Comparison of the Methods","authors":"Maja Biocic, Deni Karabatić, Dea Tomić, Lea Kukoc-Modun","doi":"10.5562/cca4016","DOIUrl":"https://doi.org/10.5562/cca4016","url":null,"abstract":"","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134884727","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Ecofriendly Synthesis of DHPMs using Copper-based Nano catalysts and Evaluation of Antibacterial Activity 基于铜基纳米催化剂的环境友好型dhpm合成及其抗菌活性评价
4区 化学
Croatica Chemica Acta Pub Date : 2023-01-01 DOI: 10.5562/cca4001
Khushboo Sharma, Narsingh Khatik, Abhinav Raj Khandelwal, Ravina Meena, Seema Bhadauria, Malvika Singh, Harshita Sachdeva
{"title":"Ecofriendly Synthesis of DHPMs using Copper-based Nano catalysts and Evaluation of Antibacterial Activity","authors":"Khushboo Sharma, Narsingh Khatik, Abhinav Raj Khandelwal, Ravina Meena, Seema Bhadauria, Malvika Singh, Harshita Sachdeva","doi":"10.5562/cca4001","DOIUrl":"https://doi.org/10.5562/cca4001","url":null,"abstract":"","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136373657","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Synthesis, Experimental and Theoretical Characterization of (μ4-oxo)hexakis(μ2-chloro)-tetrakis[1-(allyl)-1H-imidazole]tetracopper(II) (μ4-氧)六基斯(μ2-氯)四基斯[1-(烯丙基)- 1h -咪唑]四铜的合成、实验和理论表征
4区 化学
Croatica Chemica Acta Pub Date : 2023-01-01 DOI: 10.5562/cca3933
Namık Özdemir, Rukiye Fırıncı, Muhammet Emin Günay
{"title":"Synthesis, Experimental and Theoretical Characterization of (μ4-oxo)hexakis(μ2-chloro)-tetrakis[1-(allyl)-1H-imidazole]tetracopper(II)","authors":"Namık Özdemir, Rukiye Fırıncı, Muhammet Emin Günay","doi":"10.5562/cca3933","DOIUrl":"https://doi.org/10.5562/cca3933","url":null,"abstract":": A new [Cu 4 OCl 6 L 4 ] cluster [L = 1 -(allyl)-1 H -imidazole] has been isolated and its crystal structure and spectroscopic properties determined. The compound crystallizes as a yellow solid in the monoclinic system, space group P 2 1 , with cell constants a = 10.6937(7) Å, b = 13.1004(7) Å, c = 13.2452(9) Å, β = 93.537(6)°, and two formula units per cell. The title tetranuclear complex has a central µ 4 - oxide ion surrounded tetrahedrally by four Cu II atoms. Each Cu atom is connected to three others via bridging Cl atoms. The fifth coordination position, located on the central Cu─O axis on the outside of the cluster, is occupied by an N atom of the monodentate imidazole ligand. The resulting coordi nation geometry of the metal ion is a slightly distorted trigonal bipyramid with the O and N atoms in the axial positions. Th e molecular structure and spectroscopic data were obtained using density functional theory (DFT/HSEH1PBE) method with the cc - pVDZ basis set for C, H, N, O and Cl atoms, and the LANL2DZ basis set for the Cu atoms, and compared with the experimental data. Consequently, the exp erimental data well coherences with the theoretical ones.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135989432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Influence of Bitartrate Ion Concentration in the Copper Electrodeposition Onto a Polycrystalline Gold Electrode 铜电沉积中酒石酸盐离子浓度对多晶金电极的影响
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2021-06-28 DOI: 10.5562/cca3757
M. Hernández, G. Álvarez-Romero, M. Rivera, Simplicio González-Montiel, C. H. Rios-Reyes, L. Mendoza-Huizar
{"title":"Influence of Bitartrate Ion Concentration in the Copper Electrodeposition Onto a Polycrystalline Gold Electrode","authors":"M. Hernández, G. Álvarez-Romero, M. Rivera, Simplicio González-Montiel, C. H. Rios-Reyes, L. Mendoza-Huizar","doi":"10.5562/cca3757","DOIUrl":"https://doi.org/10.5562/cca3757","url":null,"abstract":": In the present work, the influence of the concentration of bitartrate ions (HT) on the copper electrodeposition process was analyzed. The study was carried out from an aqueous solution containing 0.001 M of CuX (where X = (NO 3– ) 2 ,(Cl – ) 2 , S O 4 2– ) and x M KHT (where x = 0.005 M, 0.01 M, and 0.015 M). From voltammetric and chronoamperometric studies, the results indicate that copper electrodeposition is a diffusion-controlled process. The current density transients were well described through a kinetic me chanism involving capacitive and faradaic contributions. The diffusion coefficient values of Cu 1+ and Cu 2+ result to be similar at the different concentration values of potassium bitartrate used in this work.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44838490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Catacondensed Chemical Hexagonal Complexes: A Natural Generalisation of Benzenoids 浓缩化学六方配合物:苯类化合物的自然概括
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2021-04-02 DOI: 10.5562/cca3765
Cate S. Anstöter, N. Bašić, P. Fowler, T. Pisanski
{"title":"Catacondensed Chemical Hexagonal Complexes: A Natural Generalisation of Benzenoids","authors":"Cate S. Anstöter, N. Bašić, P. Fowler, T. Pisanski","doi":"10.5562/cca3765","DOIUrl":"https://doi.org/10.5562/cca3765","url":null,"abstract":"Catacondensed benzenoids (those benzenoids having no carbon atom belonging to three hexagonal rings) form the simplest class of polycyclic aromatic hydrocarbons (PAH). They have a long history of study and are of wide chemical importance. In this paper, mathematical possibilities for natural extension of the notion of a catacondensed benzenoid are discussed, leading under plausible chemically and physically motivated restrictions to the notion of a catacondensed chemical hexagonal complex (CCHC). A general polygonal complex is a topological structure composed of polygons that are glued together along certain edges. A polygonal complex is flat if none of its edges belong to more than two polygons. A connected flat polygonal complex determines an orientable or nonorientable surface, possibly with boundary. A CCHC is then a connected flat polygonal complex all of whose polygons are hexagons and each of whose vertices belongs to at most two hexagonal faces. We prove that all CCHC are Kekulean and give formulas for counting the perfect matchings in a series of examples based on expansion of cubic graphs in which the edges are replaced by linear polyacenes of equal length. As a preliminary assessment of the likely stability of molecules with CCHC structure, all-electron quantum chemical calculations are applied to molecular structures based on several CCHC, using either linear or kinked unbranched catafused polyacenes as the expansion motif. The systems examined all have closed shells according to Huckel theory and all correspond to minima on the potential surface, thus passing the most basic test for plausibility as a chemical species.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47506122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Photo-induced Dissociation of the N1–H Bond in the Imino Tautomers of Isocytosine in Water Medium 水介质中异胞嘧啶亚胺互变异构体中N1–H键的光诱导解离
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2020-10-11 DOI: 10.5562/cca3659
B. H. Dimitrov, V. Delchev
{"title":"Photo-induced Dissociation of the N1–H Bond in the Imino Tautomers of Isocytosine in Water Medium","authors":"B. H. Dimitrov, V. Delchev","doi":"10.5562/cca3659","DOIUrl":"https://doi.org/10.5562/cca3659","url":null,"abstract":"The imino tautomers of isocytosine were objects of investigation at the TD-DFT level of theory TD BLYP/6-311++G(d,p). We studied the mechanisms of the H1-N detachment in these tautomers through excited-state reaction paths. It was proposed that these transformations occur through the 1πσ* excited-state reaction paths of the imino tautomers. The mechanisms involve dissociations of the N1–H bonds in the tautomers and lead to crossings between the reaction paths of 1πσ* and S0 electronic states. One can suppose that such processes would facilitate the tautomerizations of the imino tautomers if further mechanisms have been found.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5562/cca3659","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48453049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Rotational Barrier and Quantification of Electron-Donating Substituent Effects: a Computational Study of para-Substituted Benzaldehydes 给电子取代基效应的旋转势垒和量化:对取代苯甲醛的计算研究
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2020-10-11 DOI: 10.5562/cca3672
Ali Hussain Yateem
{"title":"Rotational Barrier and Quantification of Electron-Donating Substituent Effects: a Computational Study of para-Substituted Benzaldehydes","authors":"Ali Hussain Yateem","doi":"10.5562/cca3672","DOIUrl":"https://doi.org/10.5562/cca3672","url":null,"abstract":"The rotational barrier around the phenyl-formyl bond between the minimum and transition states of para-substituted benzaldehydes was computationally studied for 34 electron-donating substituents. The rotational barrier exhibited very good correlation with shortening of the phenyl-formyl bond, lengthening of carbonyl bond, increase of electron density at the formyl group, increase of stabilization energy, lowering of chemical shift in the 13C NMR of the formyl carbon, and with the values of empirical Hammett σp+ constants. Therefore, rotational barrier is a useful quantum mechanical parameter for quantifying the electron-donating substituent effect and π-conjugation in parasubstituted benzaldehydes. Based upon the rotational barrier a scale has been set in this work to judge the electron donating effect of substituents. Moreover, a canonical structure has been proposed for stronger electron-donating substituents. The results of this study reveal that simultaneous presence of electron acceptor formyl group and electron-donating groups is mandatory for the extension of resonance stabilization.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5562/cca3672","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47152829","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
Distribution of Rare Earth Elements in Citrus Leaves and Reference Materials (NIST SRM 1515 and ERM CD281) 柑橘叶片中稀土元素的分布及标准物质(NIST SRM 1515和ERM CD281)
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2020-10-11 DOI: 10.5562/cca3663
Ž. Fiket, Martina Furdek Turk
{"title":"Distribution of Rare Earth Elements in Citrus Leaves and Reference Materials (NIST SRM 1515 and ERM CD281)","authors":"Ž. Fiket, Martina Furdek Turk","doi":"10.5562/cca3663","DOIUrl":"https://doi.org/10.5562/cca3663","url":null,"abstract":"The present study aims to discuss the data on levels and distribution of rare earth elements, including Y, (REYs) in leaves of three different citrus species (lemon, orange, and tangerine) and provide additional information about the major, minor and trace elements in two biological certified reference materials (CRMs), Apple leave (NIST SRM 1515) and Rye grass (ERM CD281). In all samples, element concentrations were determined by High Resolution Inductively Coupled Plasma Mass Spectrometry. The obtained data display substantial variability in the distribution of REY elements, not only between different citrus species but also between different genera of plants indicating their different uptake and accumulation abilities. Measured concentrations of REYs in citrus leaves were substantially lower compared to the literature values, although the fractionation indices were comparable. The data for CRMs provide additional information for the 14 elements in NIST SRM 1515 and the 30 elements in ERM CD281, including rare earth elements.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47848027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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
A DFT Study on the Efficacy of Linking Agents (Sulfur and Nitrogen) to Connect Trans-azobenzene Sandwiched Between Two Gold Electrodes 连接剂（硫和氮）连接夹在两个金电极之间的反式偶氮苯的DFT研究
IF 0.3 4区 化学
Croatica Chemica Acta Pub Date : 2020-10-11 DOI: 10.5562/CCA3695
C. Karthika, R. Praveena, S. Ramachandran, K. Sadasivam, G. Salgado, P. Muñoz, Lorena A. Gerli, L. Mendoza-Huizar
{"title":"A DFT Study on the Efficacy of Linking Agents (Sulfur and Nitrogen) to Connect Trans-azobenzene Sandwiched Between Two Gold Electrodes","authors":"C. Karthika, R. Praveena, S. Ramachandran, K. Sadasivam, G. Salgado, P. Muñoz, Lorena A. Gerli, L. Mendoza-Huizar","doi":"10.5562/CCA3695","DOIUrl":"https://doi.org/10.5562/CCA3695","url":null,"abstract":": Electronic structure calculations were performed to analyze the effectiveness of linking agents (sulfur and nitrogen) in connecting the trans-azobenzene sandwiched between two gold surfaces (Au-atoms). It was analyzed the dynamics of the load carrier and the electronic structure of the molecular backbone by applying an external electric field (EF ), also a detailed structural, frontier orbital and natural bond orbital analysis (NBO) were performed. From the NBO analysis, it was possible to predict the path of charge flow in the molecular system. Electrostatic potential mapping allowed us to visualize the charge redistribution in the molecular system caused by the EF application. Our results indicate that when the nitrogen atom is used as a linking agent, the","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2020-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49245102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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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