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Crystal structure of pollucite Natsumi Kamiya, Koji Nishi and Yoshinobu Yokomori* Department of Applied Chemistry, National Defense Academy, Hashirimizu, Yokosuka 239-8686, Japan Received July 2, 2008; accepted September 9, 2008 Pollucite / Single crystal structure analysis / X-ray diffraction / Analcime Abstract. The crystal structure of pollucite (ANA) (Cs,Na)AlSi2O6 is characterized by single-crystal X-ray dif- fractometry. The space group C2/c, monoclinic, is found to be the most probable space group for this mineral based on the systematic absences of

Grzegorz Dutkiewicz3, Zdzisław Pająk* Institute of Physics, A. Mickiewicz University, Umultowska 85, 61-614 Poznan, Poland a Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland Z. Naturforsch. 53 b, 1323-1325 (1998); received July 21, 1998 Pyridinium Periodate, Crystal Structure The crystal structure of the room-temperature ferroelectric phase of pyridinium periodate [C6H5NH]+[I04]- has been determined by X-ray diffraction as orthorhombic, space group Cmc2i with a = 8.347(2), b = 7.270(2), c = 12.732(3) A and Z = 4. It was

American Mineralogist, Volume 92, pages 1518–1524, 2007 0003-004X/07/0809–1518$05.00/DOI: 10.2138/am.2007.2486 1518 INTRODUCTION Meurigite was Þ rst described by Birch et al. (1996) from the Santa Rita mine, Grant Co., New Mexico, where it occurs as tabular, elongated crystals forming spherical and hemispheri- cal clusters to 2 mm across. The authors noted that the Þ brous nature of meurigite made single crystal X-ray diffraction study and crystal structure determination impossible. From TEM stud- ies and indexed X-ray powder diffraction patterns, Birch

On the Crystal Structure of HgZn3 M. Pušelj*, Z. Ban Laboratory of General and Inorganic Chemistry, Faculty of Science, University of Zagreb, Zagreb, Yugoslavia A. Drašner Institut "R. Boskovic", Zagreb, Yugoslavia Z. Naturforsch. 37 b, 557-559 (1982); received December 14, 1981 Crystal Structure, Zinc, Mercury, Amalgam The crystal structure of the intermetallic phase HgZn3 was determined using X-ray single crystal and powder diffraction methods. The phase belongs to the orthorhombic system, most probable space group being Cmc2i, and appears to be

Notizen 1761 Kristallstruktur von RbNaO Crystal Structure of RbNaO Horst Sabrowsky*, Petra Vogt-Mertens und Alfred Thimm Lehrstuhl für Anorganische Chemie I (Arbeitsgruppe Festkörperchemie), Ruhr-Universität Bochum, Universitätsstraße 150, D-4630 Bochum 1 Z. Naturforsch. 4 0 b , 1761-1762 (1985); eingegangen am 22. August 1985 Rubidium Sodium Oxide, Crystal Structure The colourless compound RbNaO has been pre­ pared as described earlier [ 1 ], but single crystals were not yet available at that time. N ow its crystal structure was determined by X

491Note Molecular and Crystal Structure of Sildenafil Base Dmitrijs Stepanovs and Anatoly Mishnev Latvian Institute of Organic Synthesis, 21 Aizkraukles street, Riga, LV-1006, Latvia Reprint requests to Anatoly Mishnev. E-mail: Z. Naturforsch. 2012, 67b, 491 – 494 DOI: 10.5560/ZNB.2012-0073 Received March 8, 2012 Sildenafil citrate monohydrate, well known as Viagra R©, is a drug for the treatment of erectile dysfunction. Here we present the X-ray crystal structure of the sildenafil base, C22H30N6O4S. The compound crystallizes in the monoclinic

Notizen 243 The Crystal Structure of CuSe2Cl W. Milius* and A. Rabenau Max-Planck-Institut für Festkörperforschung, 7000 Stuttgart 80, Heisenbergstraße 1. F.R.G. Z. Naturforsch. 43b, 243-244 (1988); received October 21, 1987 Copper Chalcogen Halides, Crystal Structure of CuSe2Cl, X-Ray The crystal structure of CuSe2Cl has been deter- mined by single-crystal X-ray diffraction. CuSe2Cl crystallizes monoclinically in space group P2,/c with the lattice parameters a = 768.3(9) pm, b = 462.5(5) pm and c = 1455.2(3) pm, ß = 135.2(4)°, Z = 4. The structure

Crystal structure of betulinic acid-DMSO solvate Stanisław Boryczka*, I, Ewa BębenekI, Maria JastrzębskaII, Joachim KuszIII and Maciej ZubkoIII I Department of Organic Chemistry, Silesian Medical University, 4 Jagiellońska Str., 41-200 Sosnowiec, Poland II Department of Solid State Physics, Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007 Katowice, Poland III Department of Physics of Crystals, Institute of Physics, University of Silesia, 4 Uniwersytecka Str., 40-007 Katowice, Poland Received February 11, 2012; accepted March 30, 2012

Clathrates and semiclathrates of Type-I: crystal structure and superstructures Maria A. Kirsanova and Andrei V. Shevelkov* Department of Chemistry, Lomonosov Moscow State University, Leninskie Gory 1–3, 119991 Moscow, Russian Federation Received February 9, 2013; accepted March 21, 2013 Published online: April 29, 2013 Clathrate / Crystal structure / Superstructure Abstract. The review surveys the crystal chemistry of inorganic compounds belonging to the structure type of clathrate-I. The compounds of this family exhibit an unex- pected variety of both chemical

Difluorphosphorylcyclosilazane - Synthese und Kristallstruktur Difluorophosphorylcyclosilazanes - Syntheses and Crystal Structure Uwe Klingebiel*, Mathias Noltemeyer, Hans-Jörg Rakebrandt Institut für Anorganische Chemie der Universität Göttingen, Tammannstr. 4, D-37077 Göttingen, Germany Z. Naturforsch. 52 b, 775-777 (1997); eingegangen am 14. April 1997 Fluorophosphorylcyclosilazanes, Silicon, Crystal Structure The reaction of lithiated l,3-bis(fluorodimethyl)cyclotrisilazane with PF3 leads to the formation of a PF2-substituted six-membered Si-N ring (1). 1