Croatica Chemica Acta最新文献_第9页

Auxin Amidohydrolases – From Structure to Function: Revisited 生长素酰胺水解酶——从结构到功能的再认识

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3356

Ana Smolko, J. Ludwig-Müller, B. Salopek-Sondi

引用次数: 5

Identification of stable and enantioselective lipases for biotechnological applications 生物技术应用中稳定和对映选择性脂肪酶的鉴定

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3357

K. Jaeger, Alexander Fulton, U. Schwaneberg, J. Pietruszka, F. Kovačić

引用次数: 0

Structure and Reactivity Relationships in Methyl and Hydrido Complexes of Platinum(II) by Group 15 Donor Atom Ligands 铂（II）的15族供体原子配体甲基和氢化物配合物的结构与反应关系

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3344

S. Otto, E. Botha, A. Roodt

{"title":"Structure and Reactivity Relationships in Methyl and Hydrido Complexes of Platinum(II) by Group 15 Donor Atom Ligands","authors":"S. Otto, E. Botha, A. Roodt","doi":"10.5562/CCA3344","DOIUrl":"https://doi.org/10.5562/CCA3344","url":null,"abstract":"Square-planar substitution reactions (chlorido for iodide, trans to methyl and hydrido as non-labile ligands) was kinetically investigated in chloroform solution in a series of platinum(II) trans-[PtRCl(L)2] complexes (R = Me: L = PPh3, 1; PPh2Fc, 2; P(NMe2)3, 3; AsPh3, 5; As(4-Me-Ph)3, 6; R = H: L = PPh3, 7) and cis-[PtMeCl(Ph2PFcPPh2)], 4. The reactions follow the normal associative mode of activation, but with equilibria present in all steps, with rate constants for the direct substitution pathway, k12, of (9.1 ± 1.0) × 10−4, 0, (1.389 ± 0.016)×10−2, (1.51 ± 0.15), (2 ± 4) × 10−3, (2.79 ± 0.04) × 10−2 and 0 mol−1 dm3 s−1 at 298 K for 1 to 7 respectively. The corresponding second order rate constants for the solvent assisted pathway, k13', were also determined. The activation parameters for the direct and solvent assisted pathways for 3 were determined as ∆H≠ = 60.4 ± 1.4 and 53.7 ± 0.3 kJ mol−1, and ∆S≠ = −78 ± 4 and −142 ± 1 J mol−1 K−1. A significant more than four orders-of-magnitude reactivity range was observed. Crystal structures of trans-[PtMeCl(PPh2Fc)2].2CHCl3.2H2O, trans-[PtMeCl{P(NMe2)3}2], cis-[PtMeCl(Ph2PFcPPh2)].2CHCl3 and trans-[PtHCl(PPh3)2].CH3OH are reported.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2018-06-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49504881","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: 3

Alkali salts of nitranilic and cyanochloranilic acids 硝基和氰基氯苯胺酸的碱金属盐

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-06-04 DOI: 10.5562/CCA3333

V. Milašinović, K. Molčanov

引用次数: 4

Distribution of trace elements in waters of the Zrmanja River estuary (eastern Adriatic coast, Croatia) Zrmanja河河口（克罗地亚亚得里亚海东部海岸）水域中微量元素的分布

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-05-09 DOI: 10.5562/CCA3202

Ž. Fiket, M. Ivanić, M. Turk, N. Mikac, G. Kniewald

引用次数: 14

Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro 黑山白铝土矿中天然Allophane/Gibbsite的微观结构特征

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3276

M. Ristić, S. Krehula, S. Musić

{"title":"Microstructural Properties of Natural Allophane/Gibbsite from a White Bauxite Deposit in Montenegro","authors":"M. Ristić, S. Krehula, S. Musić","doi":"10.5562/CCA3276","DOIUrl":"https://doi.org/10.5562/CCA3276","url":null,"abstract":"Microstructural properties of white bauxite from Montenegro were investigated. XRD analysis showed the presence of allophane (Al2O3 · 2SiO2 · 3H2O) and gibbsite (γ-Al(OH)3). The allophane phase showed very broadened diffraction lines, thus indicating poor crystallinity as well as very fine nanoparticles in this phase. Upon heating of natural allophane/gibbsite at 1000 °C mullite (Al6Si2O13) was formed, but with a lower degree of crystallinity. FT-IR spectra of allophane, gibbsite and mullite were interpreted. FE-SEM images of natural allophane/gibbsite showed a dominantly amorphous-like morphology. Upon heating of natural allophane/gibbsite two-dimensional (2D) microstructure was visible. EDS analysis showed traces of calcium, potassium, magnesium and iron. The 57Fe Mössbauer spectrum of iron traces showed a small relative intensity magnetic splitting component due to the presence of hematite and a central quadrupole doublet due to the presence of Fe3+ ions substituted for Al3+ in octahedral positions and/or a superparamagnetic fraction of hematite particles. The possible geochemical mechanism of white bauxite formation in Montenegro is discussed.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2018-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48155946","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: 4

Bibliometric Analysis of Atmospheric Simulation Trends in Meteorology and Atmospheric Science Journals 气象和大气科学期刊大气模拟趋势的文献计量分析

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3210

Jinfeng Li, Yuanhang Zhang, Xuesong Wang, Y. Ho

引用次数: 42

Ultrasound-assisted and Efficient Knoevenagel Condensation Reaction Catalyzed by Silica Sodium Carbonate Nanoparticles 超声辅助纳米二氧化硅-碳酸钠催化Knoevenagel缩合反应

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3261

Yaghoub Pourshojaei, Maryam Nikzad, K. Eskandari, M. Darijani, A. Hassanzadeh, E. Faghih-Mirzaei, A. Asadipour

{"title":"Ultrasound-assisted and Efficient Knoevenagel Condensation Reaction Catalyzed by Silica Sodium Carbonate Nanoparticles","authors":"Yaghoub Pourshojaei, Maryam Nikzad, K. Eskandari, M. Darijani, A. Hassanzadeh, E. Faghih-Mirzaei, A. Asadipour","doi":"10.5562/CCA3261","DOIUrl":"https://doi.org/10.5562/CCA3261","url":null,"abstract":"An efficient and ultrasound-assisted route to the synthesis of arylidene malononitriles/methylcianoor ethylciano acetates in a onepot reaction catalyzed by silica sodium carbonate nanoparticles (SSC NPs) is described. In this reaction, SSC NPs demonstrated high efficiency as catalyst to obtain target products. By this achievement, a wide range of α,β-unsaturated compounds as Knoevenagel condensation products with good to excellent yields are obtained from reaction between numerous arylaldehydes, and malononitrile, methyl cianoacetate or ethyl cianoacetate. Target products which prepared in high yield and high purity can be candidate as important biologically active molecules. This method is an easy, cheap, rapid and highly efficient for the synthesis of desired products. In addition, capability of catalyst to separate from reaction mixture and reuse in further runs and being compatible with green chemistry are considered as other advantages of this procedure. All products were deduced from their FT-IR and FT-NMR spectroscopic and elemental analysis data.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2018-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.5562/CCA3261","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42359940","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: 7

Unsanitary Landfill Fires as a Source of a PCDD/Fs Contamination 不卫生的堆填区火灾是多氯联苯/氟污染的来源

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3145

H. Fajković, M. Ivanić, Lovorka Pitarević, I. Nemet, Sanda Rončević, E. Prohić

引用次数: 3

Antioxidant, Antimicrobial and Antiproliferative Activities of Synthesized 2,2,5,5-Tetramethyl-9-aryl-3,4,5,6,7,9-hexahydro-1 H -xanthene-1,8(2 H )-dione Derivatives 合成的2,2,5-四甲基-9-芳基-3,4,5,6,7,9-六氢-1H-杂吨-1,8（2H）-二酮衍生物的抗氧化、抗菌和抗增殖活性

IF 0.3 4区化学

Croatica Chemica Acta Pub Date : 2018-01-02 DOI: 10.5562/CCA3225

S. Zukić, E. Veljović, S. Špirtović-Halilović, Samija Muratović, A. Osmanović, S. Trifunović, I. Novaković, D. Završnik

{"title":"Antioxidant, Antimicrobial and Antiproliferative Activities of Synthesized 2,2,5,5-Tetramethyl-9-aryl-3,4,5,6,7,9-hexahydro-1 H -xanthene-1,8(2 H )-dione Derivatives","authors":"S. Zukić, E. Veljović, S. Špirtović-Halilović, Samija Muratović, A. Osmanović, S. Trifunović, I. Novaković, D. Završnik","doi":"10.5562/CCA3225","DOIUrl":"https://doi.org/10.5562/CCA3225","url":null,"abstract":"Ten biologically active 2,2,5,5-tetramethyl-9-aryl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione derivatives were synthesized and their structures were confirmed by IR, 1H and 13C NMR spectroscopy and mass spectrometry. Synthesized compounds were scanned for their antioxidant, antimicrobial and antiproliferative activity. Antibacterial activity was tested by the diffusion and dilution method against Bacillus subtilis, Staphylococcus aureus, Escherichia coli and Pseudomonas aeruginosa, while antifungal activity was tested against Candida albicans and Saccharomyces cerevisiae. Antiproliferative activity was tested against HeLa (cervical carcinoma), SW620 (colorectal adenocarcinoma, metastatic), hepatocellular carcinoma (HEpG2), lung carcinoma cells (A549) and mouse embryo fibroblast cell line (3T3). The best antioxidant activity showed compound 2 with two hydroxy groups substituted on phenyl ring in positions 2' and 3'. The best antimicrobial activity of all synthesized compounds showed compound 8, while the best antiproliferative activity showed compound 6. Results signify the importance of xanthene-1,8-dione derivatives as potential antioxidant and antiproliferative agents.","PeriodicalId":10822,"journal":{"name":"Croatica Chemica Acta","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2018-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41244856","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: 13