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  • 1. Alhalaweh, Amjad
    et al.
    Sokolowski, Anders
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry.
    Rodriguez-Hornedo, Nair
    Velaga, Sitaram P.
    Solubility Behavior and Solution Chemistry of Indomethacin Cocrystals in Organic Solvents2011In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 11, no 9, p. 3923-3929Article in journal (Refereed)
    Abstract [en]

    The main objective of this study was to investigate the solubility behavior and solution chemistry of indomethacin-saccharin (IND-SAC) cocrystals in organic media. We also evaluated previously proposed models of cocrystal solubility in organic solvents. In addition, the solubility behavior of IND-SAC cocrystals was compared with that of indomethacin-nicotinamide (IND-NIC) cocrystals using the eutectic constant approach. Phase solubility diagrams of IND-SAC cocrystals in various solvents were generated and the transition concentrations, at which drug and cocrystals are in equilibrium with the solvents, were determined. The solubility of IND-SAC cocrystals was explained by the solubility product and solution complexation. The tested models were found to fit the experimental data and to adequately explain the solubility behavior of the cocrystals. The solution complexation of IND and SAC is negligible in ethyl acetate and low in methanol and ethanol. The IND-NIC cocrystals were more soluble than the IND-SAC cocrystals in all the solvents studied. The eutectic constants predicted both the solubility and the stability of the cocrystals. Understanding the solubility behavior and solution chemistry of cocrystals has important implications for the screening, scale-up, and formulation development of this solid form. Further, the determination of eutectic constants is a simple and resource sparing means of obtaining key information on cocrystal stability and solution behavior.

  • 2. Lu, Jun
    et al.
    Gao, Xindong
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Zhang, Shi-Li
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
    Hultman, Lars
    Crystallization of NiSix in a Body-Centered Cubic Structure during Solid-State Reaction between an Ultrathin Ni Film and Si(001) Substrate at 150-350 degrees C2013In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 13, no 5, p. 1801-1806Article in journal (Refereed)
    Abstract [en]

    We investigate ultrathin silicide formation during a solid-state reaction between Ni layers and Si(001) substrates by aberration-corrected electron microscopy. Interdiffusion of two nm thick (equivalent) Ni layers with Si during magnetron-sputter deposition results in an amorphous Ni-Si solid solution. Upon annealing at 150-350 degrees C, a novel body-centered cubic (bcc) NiSix phase is found to grow epitaxially with a crystallographic relationship {100}< 001 > bcc-NiSix//{100}< 001 > Si. bcc-NiSix belongs to the space group I (4) over bar 3m (217) with random Ni and Si distribution. The cell parameter is 0.272 nm, which is approximately half that of NiSi2. Further annealing transforms bcc-NiSi to NiSi2 with an activation energy of 0.6 +/- 0.1 eV.

  • 3.
    Pandey, Mrituanjay D.
    et al.
    Banaras Hindu Univ, Inst Sci, Dept Chem, Varanasi 221005, Uttar Pradesh, India.
    Metre, Ramesh K.
    Indian Inst Technol Jodhpur, Dept Chem, Jodhpur 342011, Rajasthan, India.
    Kundu, Subrata
    Indian Inst Technol Kanpur, Dept Chem, Kanpur 208016, Uttar Pradesh, India.
    Mahanti, Bani
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström.
    Kumar, Arun
    Indian Inst Technol Kanpur, Dept Chem, Kanpur 208016, Uttar Pradesh, India.
    Gopal, Kandasamy
    Amrita Vishwa Vidyapeetham, Dept Chem, Kollam 690525, Kerala, India.
    Chandrasekhar, Vadapalli
    Indian Inst Technol Kanpur, Dept Chem, Kanpur 208016, Uttar Pradesh, India;Tata Inst Fundamental Res, Hyderabad 500107, India.
    Luminescent Pyrene-Decorated Organotin Compounds: Observation of Monomer and Excimer Emission2019In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 19, no 3, p. 1888-1895Article in journal (Refereed)
    Abstract [en]

    The pyrene-decorated luminescent organotin compounds Ph(3)SnO(2)CPyr (1), [(Bz(2)Sn)(2)(mu(3)-O)(mu-OH)-(O(2)CPyr)](2)center dot 2EtOH (2), and t-Bu2Sn[O(2)CPyr](2) (3) were synthesized from a one-pot reaction between pyrene-1-carboxylic acid (PyrCO(2)H) and the appropriate organotin precursors. The molecular and crystal structures of 1-3 were determined by single-crystal X-ray diffraction analyses, which reveal rich supramolecular architectures in their crystal structures. The luminescence properties of these compounds were studied in solution as well as in the solid state. While in the solid state all of the compounds reveal excimer bands, in solution, strong monomer emission is seen. Fluorescence lifetime measurements revealed (365 nm) that the average lifetimes of 1-3 in solution could be estimated as 4.97 ns (1), 4.69 ns (2), and 6.93 ns (3).

  • 4.
    Sun, Rui
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Willhammar, Tom
    Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
    Grape, Erik Svensson
    Stockholm Univ, Dept Mat & Environm Chem, SE-10691 Stockholm, Sweden.
    Strömme, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials. Uppsala Univ, Dept Engn Sci, Div Nanotechnol & Funct Mat, SE-75121 Uppsala, Sweden.
    Cheung, Ocean
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Mesoscale Transformation of Amorphous Calcium Carbonate to Porous Vaterite Microparticles with Morphology Control2019In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 19, no 9, p. 5075-5087Article in journal (Refereed)
    Abstract [en]

    The morphology controlled synthesis of porous vaterite microparticles from amorphous calcium carbonate (ACC) nanoparticles via mesoscale transformation and self-assembly is presented. The morphology of vaterite microparticles ranging from ellipsoidal to spherical can be controlled by adjusting the amount of adipic acid (AA) additive during synthesis. Electron microscopy and electron diffraction reveal that the vaterite microparticles are formed by the oriented self-assembly of vaterite nanocrystals. The Brunauer-Emmett-Teller (BET) surface area of the vaterite microparticle varies between similar to 30 and similar to 80 m(2)/g. The coverage of AA on the surface of the ACC nanoparticle plays the pivotal role in the morphology controlled synthesis of vaterite microparticles. 6-Aminocaproic acid (6A), benzoic acid (BA), citric acid (CA), and poly(acrylic acid) (PAA) are also tested as additives and their effect on the morphology of vaterite microparticles is presented. Morphology control of functional materials can be beneficial for application where the morphology and porosity are critical, such as drug delivery. This work demonstrates a possible method to finely adjust the morphology of vaterite microparticles with the assistance of additives through mesoscale transformation and self-assembly using amorphous nanoparticles as precursors.

  • 5.
    Usman, Rabia
    et al.
    Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China.
    Khan, Arshad
    Southeast Univ, State Key Lab Bioelect, Nanjing 210096, Jiangsu, Peoples R China.
    Wang, Mingliang
    Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China.
    Luo, Yi
    Southeast Univ, Sch Mat Sci & Engn, Jiangsu Key Lab Adv Metall Mat, Nanjing 211189, Jiangsu, Peoples R China.
    Sun, Weiwei
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory. KTH Royal Inst Technol, Dept Mat Sci & Engn, Stockholm, Sweden.
    Sun, Hao
    Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China.
    Du, Cunbin
    Southeast Univ, Sch Chem & Chem Engn, Nanjing 211189, Jiangsu, Peoples R China.
    He, Nongyue
    Southeast Univ, State Key Lab Bioelect, Nanjing 210096, Jiangsu, Peoples R China.
    Investigation of Charge-Transfer Interaction in Mixed Stack Donor-Acceptor Cocrystals Toward Tunable Solid-State Emission Characteristics2018In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 18, no 10, p. 6001-6008Article in journal (Refereed)
    Abstract [en]

    The formation of three mixed binary charge transfer (CT) cocrystals with tunable photoluminescence behavior featuring both CT interaction and directional hydrogen bonding is presented. Our strategy consists of the CT induced cocrystallization of three polycyclic (naphthalene, anthracene, and pyrene) carrying a-cyanostilbene (CS) derivatives, namely, 3-(naphthalene-2-yl)-2-(p-tolyl) acrylonitrile (NPA), 3-(anthracene-9-yl)-2-phenylacrylonitrile (APA), and 2-(4-methoxyphenyl)-3-(pyrene-I-yl) acrylonitrile (MPA) as donors (D) with 1,2,4,5-tetracyanobenzene (TCNB) as an acceptor (A). The as prepared cocrystals were probed in detail by various analytical techniques, namely, X-ray diffraction data, vibrational spectroscopy, diffuse reflectance absorption spectroscopy, fluorescence properties, and fluorescence quantum yields and lifetimes, affirming the formation of CT complexes. Complex IA features a mixed stack arrangement (D-A-D-A-D), while IIA and IIIA revealed (DAD-DAD) stack arrangement. The CT products showed distinct tunable emission colors and photoluminescence characteristics, which is closely associated with the CT interactions between the donor and acceptor moiety, and ionization potential or the it pi-electron rich character of the polycyclic moiety of the donor molecule. This research demonstrates the development of new hybrid CT functional materials with enhanced optical properties such as absorption, fluorescence emissions, and lifetimes compared to the pristine donors, which is important for the exploration of new solid-state luminescent materials.

  • 6.
    Widenkvist, Erika
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Quinlan, Ronald A.
    Dept of Applied Science.
    Holloway, Brian C.
    Luna Innovations Nano Works Division.
    Grennberg, Helena
    Dept of biochemistry and organic chemistry.
    Jansson, Ulf
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Materials Chemistry.
    Synthesis of Nanostructed Tungsten Oxide Thin Films2008In: Crystal Growth & Design, ISSN 1528-7483, E-ISSN 1528-7505, Vol. 8, no 10, p. 3750-3753Article in journal (Refereed)
    Abstract [en]

    A facile and inexpensive method to produce thin films of nanostructured tungsten oxide is described. A nanocrystalline tungstite (WO3·H2O) film is spontaneously formed when a tungsten substrate is immersed in nitric acid at elevated temperatures. The resulting thin film is composed of plate-like tungstite crystals with edges preferentially directed out from the substrate surface. The tungstite can easily be transformed into WO3 by annealing. Patterned WO3·H2O/W structures can be obtained by a combination of lithographic techniques and etching. In this study, the effect of exposure time, acid concentration, and temperature on the microstructure of the films has been investigated. The potential of this inexpensive synthesis method to produce large-area coatings of nanostructured tungsten oxide as well as patterned films makes it interesting for several different applications, such as batteries, gas sensors, and photocatalysts.

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