Browsing Luonnontieteiden, metsätieteiden ja tekniikan tiedekunta by Author "Department of Chemistry, activities"
Now showing items 1-20 of 97
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A new crystal form of Aspergillus oryzae catechol oxidase and evaluation of copper site structures in coupled binuclear copper enzymes
Penttinen, L; Rutanen, C; Saloheimo, M; Kruus, K; Rouvinen, J; Hakulinen, N (Public Library of Science (PLoS), 2018)Coupled binuclear copper (CBC) enzymes have a conserved type 3 copper site that binds molecular oxygen to oxidize various mono- and diphenolic compounds. In this study, we found a new crystal form of catechol oxidase from ...Tieteelliset aikakauslehtiartikkelit
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A silver metal complex as a luminescent probe for enzymatic sensing of glucose in blood plasma and urine
Pan, ZB; Wang, YC; Chakkaradhari, G; Zhu, JF; He, RY; Liu, YC; Hsu, CH; Koshevoy, IO; Chou, PT; Pan, SW; Ho, ML (Royal Society of Chemistry (RSC), 2018)In this work, we present a facile preparation of a paper-based glucose assay for rapid, sensitive, and quantitative measurement of glucose in blood plasma and urine. Two copper phosphorescent complexes [Cu(2,9-dimethyl-4 ...Tieteelliset aikakauslehtiartikkelit
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A simple one-step fabrication of gold nanoparticles-based surface-enhanced Raman scattering substrates using rice grains
Philip, A; Ankudze, B; Pakkanen, TT (Elsevier BV, 2019)Metal nanoparticles synthesized using the green methods are essential for utilization of the nanoparticles in diagnostic and therapeutic applications. The usual syntheses of the metallic nanoparticles often involve toxic ...Tieteelliset aikakauslehtiartikkelit
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Activation of the Cyano Group at Imidazole via Copper Stimulated Alcoholysis
Gayfullina, Rezeda; Jääskeläinen, Sirpa; Koshevoy, Igor O; Hirva, Pipsa (MDPI AG, 2019)Reactions of 4,5-dicyano-1-methylimidazole with CuX2 (X = Cl, Br) in alcohol solvents (ethanol and methanol) resulted in the formation of Cu(II) carboximidate complexes [CuCl2(5- cyano-4-C(OEt)N-1-methylimidazole)(EtOH)] ...Tieteelliset aikakauslehtiartikkelit
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Adhesive friction and wear of micro-pillared polymers in dry contact
Voyer, Joel; Jiang, Yu; Pakkanen, Tapani A; Diem, Alexander (Elsevier BV, 2018)Elastomers are currently used intensively in various industrial applications. However, their deployment in dry tribological contact is normally inhibited by their poor dry sliding friction behaviour due to their intrinsically ...Tieteelliset aikakauslehtiartikkelit
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Adsorption of Titanium Tetrachloride on Magnesium Dichloride Clusters
Zorve, Peter; Linnolahti, Mikko (American Chemical Society (ACS), 2018)Magnesium dichloride and titanium tetrachloride are key components in heterogeneous Ziegler–Natta olefin polymerization catalysis. We have determined the preferred binding modes of titanium tetrachloride on magnesium ...Tieteelliset aikakauslehtiartikkelit
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Antibacterial activity of silver and titania nanoparticles on glass surfaces
Kummala, Ruut; Brobbey, Kofi J; Haapanen, Janne; Mäkelä, Jyrki M; Gunell, Marianne; Eerola, Erkki; Huovinen, Pentti; Toivakka, Martti; Saarinen, Jarkko J (IOP Publishing, 2019)A liquid flame spray (LFS) nanoparticle deposition process was used to generate glass surfaces with silver (Ag) and titania (TiO2) nanoparticles for antibacterial activity against two common pathogenic bacteria causing ...Tieteelliset aikakauslehtiartikkelit
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Are Methylaluminoxane Activators Sheets?
Collins, Scott; Hasan, Galib; Joshi, Anuj; McIndoe, J Scott; Linnolahti, Mikko (Wiley, 2021)Density functional theory calculations on neutral sheet models for methylaluminoxane (MAO) indicate that these structures, containing 5-coordinate and 4-coordinate Al, are likely precursors to ion-pairs seen during the ...Tieteelliset aikakauslehtiartikkelit
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Atomistic simulations of the swelling behaviour of Na-montmorillonite in mixed NaCl and CaCl2 solutions
Akinwunmi, B; Kporha, FEA; Hirvi, JT; Kasa, S; Pakkanen, TA (Elsevier BV, 2020)Using molecular dynamics simulations, the interlayer swelling pressure of Na-montmorillonite clay was determined at different dry densities and ionic strengths while varying the concentration of NaCl and CaCl2. The composition ...Tieteelliset aikakauslehtiartikkelit
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Base-catalyzed oxidative depolymerization of softwood kraft lignin
Paananen, Hanna; Eronen, Eemeli; Mäkinen, Marko; Jänis, Janne; Suvanto, Mika; Pakkanen, Tuula T (Elsevier BV, 2020)Lignin is an important aromatic biopolymer with the structure based on phenolic units. Depolymerized lignin materials can be useful substitutes for phenol in phenol-formaldehyde resins. Our aim was to examine the potential ...Tieteelliset aikakauslehtiartikkelit
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Benzothiazolethione complexes of coinage metals: from mononuclear complexes to clusters and polymers
Jääskeläinen, Sirpa; Koskinen, Laura; Haukka, Matti; Hirva, Pipsa (Elsevier BV, 2019)The reactions of 2(3H)-benzothiazolethione (Hbtt) with [AuCl(tetrahydrothiophene)] and CuBr2 were studied, and found to yield a tetranuclear cluster compound [Au(btt)]4 [1] and a polymeric structure [CuBr(btt-btt)]n.nTHF ...Tieteelliset aikakauslehtiartikkelit
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Carbene metal amide photoemitters: tailoringconformationallyflexible amides for full colorrange emissions including white-emitting OLED
Romanov, Alexander S; Jones, Saul TE; Gu, Qinying; Conaghan, Patrick J; Drummond, Bluebell H; Feng, Jiale; Chotard, Florian; Buizza, Leonardo; Foley, Morgan; Linnolahti, Mikko; Credgington, Dan; Bochmann, Manfred (Royal Society of Chemistry (RSC), 2019)Conformationally flexible “Carbene–Metal–Amide” (CMA) complexes of copper and gold have been developed based on a combination of sterically hindered cyclic (alkyl)(amino)carbene (CAAC) and 6- and 7-ring heterocyclic amide ...Tieteelliset aikakauslehtiartikkelit
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Carbene-Metal-Amide Polycrystalline Materials Feature Blue Shifted Energy yet Unchanged Kinetics of Emission
Feng, Jiale; Taffet, Elliot J; Reponen, Antti-Pekka M; Romanov, Alexander S; Olivier, Yoann; Lemaur, Vincent; Yang, Lupeng; Linnolahti, Mikko; Bochmann, Manfred; Beljonne, David; Credgington, Dan (American Chemical Society (ACS), 2020)The nature of carbene–metal–amide (CMA) photoluminescence in the solid state is explored through spectroscopic and quantum-chemical investigations on a representative Au-centered molecule. The crystalline phase offers ...Tieteelliset aikakauslehtiartikkelit
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Catalytic reactions on magnesium dichloride clusters saturated by titanium tetrachloride
Zorve, Peter; Linnolahti, Mikko (Elsevier BV, 2021)Magnesium dichloride, titanium tetrachloride, and triethyl aluminum are essential components in the Ziegler-Natta catalysts for olefin polymerization. We report a systematic computational investigation (M06-2X/def-TZVP ...Tieteelliset aikakauslehtiartikkelit
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Characterization of flame coated nanoparticle surfaces with antibacterial properties and the heat-induced embedding in thermoplastic-coated paper
Brobbey, Kofi J; Haapanen, Janne; Mäkelä, Jyrki M; Gunell, Marianne; Eerola, Erkki; Rosqvist, Emil; Peltonen, Jouko; Saarinen, Jarkko J; Toivakka, Martti (Springer Nature, 2019)Silver nanoparticles deposited on surfaces can provide an antibacterial effect with potential uses in, for example, healthcare settings. However, release of nanoparticles and their potential exposure to the environment is ...Tieteelliset aikakauslehtiartikkelit
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Chemical Fingerprinting of Conifer Needle Essential Oils and Solvent Extracts by Ultrahigh-Resolution Fourier Transform Ion Cyclotron Resonance Mass Spectrometry
Mofikoya, Omolara O.; Mäkinen, Marko; Jänis, Janne (American Chemical Society (ACS), 2020)Extractives are an important class of compounds in plants because they contribute to many of their physicochemical properties such as color, odor, density, strength, permeability, and hygroscopicity. Moreover, they also ...Tieteelliset aikakauslehtiartikkelit
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Chromophore-Functionalized Phenanthro-diimine Ligands and Their Re(I) Complexes
Kisel, KS; Eskelinen, T; Zafar, W; Solomatina, AI; Hirva, P; Grachova, EV; Tunik, SP; Koshevoy, IO (American Chemical Society (ACS), 2018)A series of diimine ligands has been designed on the basis of 2-pyridyl-1H-phenanthro[9,10-d]imidazole (L1, L2). Coupling the basic motif of L1 with anthracene-containing fragments affords the bichromophore compounds L3–L5, ...Tieteelliset aikakauslehtiartikkelit
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Computational study of the roles of alkali cation species in the swelling pressure of smectites
Fayoyiwa, AD; Hirvi, JT; Pakkanen, TA (Elsevier BV, 2020)Interlayer cations largely determine the swellability of expansive clays. An atomic level study was carried out to determine the effect of monovalent interlayer cations on the swelling behavior of two different smectite ...Tieteelliset aikakauslehtiartikkelit
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Corrosion Protection of Injection Molded Porous 440C Stainless Steel by Electroplated Zinc Coating
Kultamaa, Matti; Mönkkönen, Kari; Saarinen, Jarkko J.; Suvanto, Mika (MDPI AG, 2021)Zinc electroplating was used to enhance corrosion resistance of porous metal injection molded 440C stainless steel. Controlled porosity was achieved by the powder space holder technique and by using sodium chloride as a ...Tieteelliset aikakauslehtiartikkelit
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Cyanide-assembled d10 coordination polymers and cycles: excited state metallophilic modulation of solid-state luminescence
Koshevoy IO; Belyaev A; Eskelinen T; Dau TM; Ershova YY; Melnikov AS; Tunik SP; Hirva P (Wiley-Blackwell, 2018)The series of cyanide‐bridged coordination polymers [(P2)CuCN]n (1), [(P2)Cu{M(CN)2}]n (M=Cu 3, Ag 4, Au 5) and molecular tetrametallic clusters [{(P4)MM'(CN)}2]2+ (MM′=Cu2 6, Ag2 7, AgCu 8, AuCu 9, AuAg 10) were obtained ...Tieteelliset aikakauslehtiartikkelit