| 1 | Author
| Ursula Eberz, Werner Seelentag, Hans-Uwe Schuster | Requires cookie* | | Title
| Zur Kenntnis farbiger ternärer und quaternärer Zintl-Phasen Coloured Ternary and Quaternary Zintl-Phases  | | | Abstract
| Ternary and quaternary, mostly coloured compounds of Au, Pd and Pt, resp., with Li, Mg, Sc and Sn were prepared and structurally investigated. They crystallize in a "filled" Zinkblende type structure (space group F?3m) and can be characterized as ternary or quaternary Zintl-phases. Colours seem to depend on unfilled d-orbitals of Au, Pd or Pt. | | |
Reference
| Z. Naturforsch. 35b, 1341—1343 (1980); eingegangen am 5. August 1980 | | |
Published
| 1980 | | |
Keywords
| Lithium, Magnesium, Scandium, Gold, Palladium | | |
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| default:Reihe_B/35/ZNB-1980-35b-1341.pdf | | | Identifier
| ZNB-1980-35b-1341 | | | Volume
| 35 | |
3 | Author
| V. Ikto, R. Keimes, A. Lb Rech, M. Ewis | Requires cookie* | | Title
| M g6N i16A s7 -a N ew G Phase  | | | Abstract
| Mg6N i16A s7 (F m 3m ; a = 11.479(1) Ä; Z = 4) was prepared by heating a mixture of the ele ments and investigated by m eans of single crystal X-ray methods. The arsenide crystallizes in a m o dified Th6Mn23 type structure, similar to many ternary com pounds of the com position A 6M 16X 7, called G phases. | | |
Reference
| Z. Naturforsch. 50b, 1275—1276 (1995); eingegangen am 6. März 1995 | | |
Published
| 1995 | | |
Keywords
| Ternary Nickelarsenide, Magnesium, Crystal Structure | | |
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| default:Reihe_B/50/ZNB-1995-50b-1275_n.pdf | | | Identifier
| ZNB-1995-50b-1275_n | | | Volume
| 50 | |
4 | Author
| Ratikanta Mishra, Rolf-Dieter Hoffmann, Rainer Pöttgen | Requires cookie* | | Title
| New Magnesium Compounds /fcE2Cu2Mg (RE = Y, La -Nd, Sm, Gd -Tm, Lu) with Mo2FeB2 Type Structure  | | | Abstract
| The title compounds were synthesized by reaction of the elements in sealed tantalum tubes in a water-cooled sample chamber in a high-frequency furnace. These magnesium intermetallics crystallize with the tetragonal Mo2FeB2 type structure, space group PMmbm. The lattice pa rameters of all compounds were refined from X-ray powder data. Single crystal X-ray data yielded a = 792.09(6), c = 396.31(8) pm, wR2 = 0.0396, 315 F 2 values for La2Cu2Mg, a = 778.30(5), c = 384.04(5) pm, wR2 = 0.0954, 214 F 2 values for Nd2Cu2Mg, and a = 762.65(5), c = 374.09(3) pm, wR2 = 0.0566, 186 F 2 values for Y2Cu2Mg with 12 variable parameters for each refinement. The /?£, 2Cu2Mg structures can be described as an intergrowth of distorted A1B2 and CsCl related slabs of compositions RECui and REMg. Chemical bonding in La2Cu2Mg was investigated on the basis of extended Hückel calculations and compared to isotypic La2Cu2ln. This structure was also refined from single crystal X-ray data: PMmbm, a = 780.8(2), c = 400.1(2) pm, wR2 = 0.0351, 211 F 2 values and 12 variable parameters. | | |
Reference
| Z. Naturforsch. 56b, 239—244 (2001); received January 25 2001 | | |
Published
| 2001 | | |
Keywords
| Intermetallic Compounds, Magnesium, Crystal Structure | | |
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| default:Reihe_B/56/ZNB-2001-56b-0239.pdf | | | Identifier
| ZNB-2001-56b-0239 | | | Volume
| 56 | |
7 | Author
| Klaus Angerm, Borislav Bogdanović, GudrunK. Oppetsch, Carl Krüger, RichardM. Ynott, Manfred Schwickardi, Yi-H Ung Tsay | Requires cookie* | | Title
| Magnesiumorganische Innerkomplexe, Teil I [1] Bis(dialkylaminoalkyl)-und Bis(alkoxybutyl)magnesium-Verbindungen Organomagnesium Inner C om plexes, Part I [1] Bis(dialkylaminoalkyl)-and Bis(alkoxybutyl)m agnesium Compounds  | | | Abstract
| A series of magnesium inner complexes has been prepared by reacting M gH2 (prepared by homogeneous catalysis) with dialkylallyl-and -3-butenylam ines and -3-butenylethers in the p re sence of catalytic amounts of Z rC l4. The m onom eric nature of bis(4-m ethoxybutyl)m agnesium has been confirmed by X-ray diffraction. The analogous syntheses of bis(3-alkoxypropyl)magnesium com pounds failed: cleavage of the allyl ether with elimination of propene occurred. This cleavage reaction is accelerated by catalytic amounts of NiCl2 or ZrC l4. | | |
Reference
| Z. Naturforsch. 41b, 455 (1986); eingegangen am 21. N ovem ber 1985 | | |
Published
| 1986 | | |
Keywords
| Magnesium, Inner Complexes, Crystal Structure, X-Ray | | |
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| default:Reihe_B/41/ZNB-1986-41b-0455.pdf | | | Identifier
| ZNB-1986-41b-0455 | | | Volume
| 41 | |
8 | Author
| C. U., D. Osterloh, Hk Müller-Buschbaum | Requires cookie* | | Title
| Das erste Oxocuprat/-Arsenat mit Kupfer in gemischter Valenz  | | | Abstract
| ,56C u o , 4 4) C u (A s 0 4)3 The First O xocuprate/Arsenate Containing Mixed Valent Copper: Cu(Mg2.56Cu0.44)C u(A sO4) 3 Single crystals of Cu(Mg2 56Cu0 44)C u (A s0 4)3 have been prepared by C 0 2-LASER technique and investigated by X-ray diffraction methods. The light blue crystals show monoclinic sym metry, space group C2h-C 2/c, a = 11.897, b = 12.855, c -6.688 A, ß = 113.06°, Z = 4. The structure type is characterized by A s 0 4 tetrahedra, dumb-bell-like coordinated Cu(I), twisted C u 0 4 square polygons and octahedra statistically occupied by Mg/Cu2+. | | |
Reference
| Z. Naturforsch. 49b, 589—592 (1994); eingegangen am 14. Januar 1994 | | |
Published
| 1994 | | |
Keywords
| Magnesium, Copper, Arsenic Oxide, Crystal Structure | | |
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| default:Reihe_B/49/ZNB-1994-49b-0589.pdf | | | Identifier
| ZNB-1994-49b-0589 | | | Volume
| 49 | |
9 | Author
| H. Szillat, Hk Müller-Buschbaum | Requires cookie* | | Title
| Synthese und Kristallstruktur eines Oxoantimonats mit Verwandtschaft zum Delafossit-Typ: Cu3MgSbl940 6 Synthesis and Crystal Structure of an Oxoantimonate with Relationship to the Delafossite Type: Cu3MgSbi 40 6  | | | Abstract
| Single crystals of Cu3MgSb140 6 have been prepared by crystallization from melts and investigated by X-ray diffractometer techniques. Cu^MgSb] 40 6 crystallizes trigonally, space group C 3v — R3/c, a = 5.348(1), c = 34.482(8) A, Z = 6, with a Delafossite related new structure, characterized by layers containing S b 0 6 and M g06 octahedra. These layers are connected by O -C u -O dumb-bells. The crystal structure is discussed with respect to the Delafossite type. | | |
Reference
| Z. Naturforsch. 50b, 261—264 (1995); eingegangen am 26. September 1994 | | |
Published
| 1995 | | |
Keywords
| Crystal Structure, Copper, Magnesium, Antimony, Oxide | | |
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| default:Reihe_B/50/ZNB-1995-50b-0261.pdf | | | Identifier
| ZNB-1995-50b-0261 | | | Volume
| 50 | |
10 | Author
| VerbindungC., S. Münchau, Hk Müller-Buschbaum | Requires cookie* | | Title
| Synthese und Kristallstruktur einer mit dem Johillerit verwandten  | | | Abstract
| Single crystals of C dC u^M gx.5Pbo.5V30 12 have been prepared in closed steel tubes using V 20 5 as a flux. The orange crystals show monoclinic symmetry, space group C2h-C 2 /c , a = 12.417(5), b = 12.983(6), c = 6.911(3) Ä , ß = 113.02(1)°, Z = 4. CdCu1.5Mg1.5PbojV30 12 reveals a relationship to the Johillerite type, but it is characterized by an additional point position for cadmium, situated betw een the square planar C u 0 4 polygons of the Johillerite structure. | | |
Reference
| Z. Naturforsch. 50b, 1158—1162 (1995); eingegangen am 22. D ezem ber 1994 | | |
Published
| 1995 | | |
Keywords
| Cadmium, Copper, Magnesium, Lead, Vanadium, Oxide, Crystal Structure | | |
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| default:Reihe_B/50/ZNB-1995-50b-1158.pdf | | | Identifier
| ZNB-1995-50b-1158 | | | Volume
| 50 | |
11 | Author
| D. Frerichs, Hk Müller-Buschbaum | Requires cookie* | | Title
| Vier verschiedene Koordinationspolyeder um Cu2+ im Oxid-Arsenat-Phosphat Cu0  | | | Abstract
| (Cu,M g)3(As1_xPJt:0 4)2 (x = 0,3) Four Different Coordination Polyhedra Around Copper in the Oxide-Arsenate-Phosphate C u0(C u,M g)3(A s,_xP,.04)2 (x = 0.3) Single crystals of CuO(Cu,Mg)3[(As0.7P0.3)O4]2 have been prepared by crystallization from melts. The compound crystallizes with triclinic symmetry, space group C '-P l, a = 6.372(4), b = 7.643(7), c = 8.175(5) A, a = 98.59(6), ß = 112.26(3), 7 = 99.03(3)°, Z = 2. CuO(Cu,Mg)3[(Aso)7Po 3)0 4]2 is isotypic to Cu4(P 0 4)20 . X-ray investigations show square planar C u 04 polygons, twisted tetragonal C u 0 5 pyramids, C u 05 bipyramids and elongated (Cu,M g)06 octahedra. | | |
Reference
| (Z. Naturforsch. 51b, 25—28 [1996]; eingegangen am 27. Juli 1995) | | |
Published
| 1996 | | |
Keywords
| Copper, Magnesium, Arsenate, Phosphate, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0025.pdf | | | Identifier
| ZNB-1996-51b-0025 | | | Volume
| 51 | |
12 | Author
| Z., D. Frerichs, Hk Müller-Buschbaum | Requires cookie* | | Title
| Synthesis and Crystal Chemistry o f the /3-Form o f a M ixed Zinc Orthoarsenate  | | | Abstract
| Single crystals o f Zn228M g0 72(A s 0 4) 2 have been prepared by C 0 2 L A S E R techniques. The compound crystallizes with monoclinic symmetry space group C 2h-P2j/n and the lattice parameters a = 5.292(2), b = 8.450(3), c = 7.737(3) Ä , ß = 96.33(3)°, Z = 2. Zn2 28M g072(A s O 4) 2 is isotypic to /3-Zn3(A s 0 4)2. The formation of the /3-Zn3(A s 0 4) 2 struc ture instead o f other possible orthoarsenates is discussed. | | |
Reference
| Z. Naturforsch. 51b, 469—472 (1996); eingegangen am 2. Oktober 1995 | | |
Published
| 1996 | | |
Keywords
| Zinc, Magnesium, Arsenic, Oxide, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0469.pdf | | | Identifier
| ZNB-1996-51b-0469 | | | Volume
| 51 | |
13 | Author
| V- | Requires cookie* | | Title
| Zwei monokline Kupfer-Oxovanadate des Magnesiums mit geordneter Metallverteilung: /w-Mg2CuV20 8 und MgCu2V20 8. Ein Beitrag zur Dimorphie von Mg2CuV2Os Two Monoclinic Copper Oxovanadates of Magnesium Showing Ordered Metal Distribution: m-Mg9CuV-,08 and MgCu  | | | Abstract
| Single crystals of ra-Mg2CuV20 8 (I) and MgCu2V20 8 (II) have been prepared by solid state reactions. The orange (I) and dark red (II) crystals show monoclinic symmetry, space group C2h -P2,/c, (I): a = 6.167(3), b = 8.172(5), c = 6.400(8) Ä, ß = 116.22(3)°, Z = 2; (II): a = 6.453(1), b = 8.342(2), c = 11.517(2) Ä, ß = 90.44(2), Z = 4. Both compounds show ordered metal distributions and vanadium in tetrahedral coordination by oxygen. (I) is characterized by elongated C u06 octahedra and (II) by trigonal C u 0 5 bipyramids. ra-Mg2CuV20 8 is the low temperature form of the formerly investigated orthorhombic o-Mg2CuV2Ö8. Calculations of the Coulomb parts of the lattice energy of the two crystal forms are discussed. | | |
Reference
| Z. Naturforsch. 51b, 817—821 (1996); eingegangen am 4. Dezember 1995 | | |
Published
| 1996 | | |
Keywords
| Magnesium, Copper, Vanadium Oxide, Crystal Structure | | |
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| default:Reihe_B/51/ZNB-1996-51b-0817.pdf | | | Identifier
| ZNB-1996-51b-0817 | | | Volume
| 51 | |
14 | Author
| R. Rettich, Hk Müller-Buschbaum | Requires cookie* | | Title
| Isolierte MnCl6-Oktaeder im Oxohalogeno-Vanadat Ba5(Mg0,4Mn0,6)(V2O7)2MnCl6 Isolated MnCl6 Octahedra in the Oxohalogeno Vanadate Ba5(M g0 4Mn0 6)(V20 7)2MnCl6  | | | Abstract
| Single crystals o f Ba5(M g0 4Mn0 6)(V20 7)2MnCl6 have been prepared by solid state reactions of M g C 0 3, Mn20 3, V20<i and BaCl2 -2H20 below the melting point of BaCl2. The new vanadium oxide chloride crystallizesowith monoclinic symmetry, space group C2h-P2/c, a = 13.345(4), b = 5.711(2), c = 15.859(4) Ä, ß = 113.69(2)°, Z = 2. Special features of the crystal structure are isolated MnCl6 octahedra and layers created by divanadat groups and (M g,M n)06 octahedra. The ^ [(Mg,Mn)V20 7] nets of Ba5(Mg0 4Mn0 6)(V20 7)2MnCl6 are discussed with respect to other oxohalogeno vanadates containing divanadate groups. | | |
Reference
| Z. Naturforsch. 52b, 457—461 (1997); eingegangen am 15. Januar 1997 | | |
Published
| 1997 | | |
Keywords
| Barium, Magnesium, Manganese, Chlorine, Vanadium Oxide | | |
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| default:Reihe_B/52/ZNB-1997-52b-0457.pdf | | | Identifier
| ZNB-1997-52b-0457 | | | Volume
| 52 | |
15 | Author
| Z. Naturforsch | Requires cookie* | | Title
| Kristallstruktur von MgS03*H20  | | | Abstract
| The crystal structure of M g S 0 3 H20 , space group P 2 \ln, Z = 4, Dx = 2.415 g em -3 , a = 4.699(1), b = 12.751(3), c = 5.618(1) Ä, ß = 90.49(3)°, was determined by single crystal X-ray diffraction. M g S 0 3 H20 crystallizes in the M n S 0 3 H20 type. The structure consists of buckled trans layers ^ [M gS03 H20 ], which are built up from strongly distorted M g 0 5(H20) octahedra sharing four equatorial vertices, and of trigonal pyramidal S 0 32-ions. It is close ly related to the structures of orthorhombic M nSe0s3 D 20 and monoclinic Z n S e 0 3 H20 . The M g -0 distances range from 2.051(3) to 2.175(4) A. The S-O distances (1.543(3), 1.547(3) and 1.493(3) Ä) and the O-S-O angles (98.4(2) and 2x 106.0(2)°) correspond to those in M n S 0 3 H20 . The distortion of the M 0 5(H20) octahedra (M = Mg, Mn) and of the S 0 32-ions is smaller in M g S 0 3 H20 , but with greater deviations from m symmetry. The distances between the H-connected ^ [M S 03 H20 ] layers are greater in M g S 0 3 H 20 , indicating weaker inter-layer hydrogen bonds. The lateral arrangement of the 2 [M S 0 3 H20 ] layers is nearly the same in both sulfite monohydrates. E in le itu n g | | |
Reference
| Z. Naturforsch. 53b, 131—134 (1998); eingegangen am 10. November 1997 | | |
Published
| 1998 | | |
Keywords
| X-Ray, Sulfites, Hydrates, Magnesium, Pseudosymmetry | | |
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| default:Reihe_B/53/ZNB-1998-53b-0131.pdf | | | Identifier
| ZNB-1998-53b-0131 | | | Volume
| 53 | |
16 | Author
| Werner Buchholz, Hans-Uwe Schuster | Requires cookie* | | Title
| Die Verbindungen MgFe6Ge6 und LiCo6Ge6 The Compounds MgFeßGee and LiCoöGee  | | | Abstract
| The hexagonally crystallizing compounds MgFeeGeß and LiCoeGeß were prepared and structurally characterized by single crystal investigations. The lattice constants are a = 506.7 pm, c — 804.5 pm, c/a—1.58s for MgFe6Ge6 and a = 504.8 pm, c = 772.9 pm, c/a = 1.53i for LiCoßGee. The structures (space group P6/mmm) are closely related to the structure of LiFeeGe6 and the B35-type structure of FeGe. | | |
Reference
| Z. Naturforsch. 33b, 877—880 (1978); eingegangen am 26. Mai 1978 | | |
Published
| 1978 | | |
Keywords
| Ternary Germanium Compounds, Magnesium, Iron, Lithium, Cobalt, Crystal Structure | | |
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| default:Reihe_B/33/ZNB-1978-33b-0877.pdf | | | Identifier
| ZNB-1978-33b-0877 | | | Volume
| 33 | |
17 | Author
| B. Demmig, H. Gimmler | Requires cookie* | | Title
| Effect of Divalent Cations on Cation Fluxes Across the Chloroplast Envelope and on Photosynthesis of Intact Chloroplasts  | | | Abstract
| The effect of divalent cations on cation fluxes across the chloroplast envelope and on photo synthetic reactions of intact spinach chloroplasts was investigated. In the absence of EDTA, divalent cations inhibited photosynthetic C 0 2-fixation and PGA-reduction at low PGA concentrations, but had almost no effect on the reduction of OAA, BQ, and on PGA-reduction at high PGA concentrations. The inhibitory effect of Ca2+ was greater than that of M g2+. Inhibition of photosynthesis was greater when the divalent cations were added in the dark than when added in the light. In spite of its inhibitory effect, Mg2+ partially restored the Ca2+ inhibited photosynthesis, indicating the involvement of a Mg2+ /Ca2+ antagonism in the inhibitory effect. The inhibitory effect of divalent cations is stronger in a medium with low concentrations of K + than in the presence of 20 — 50 m M KC1. Mg2+ induced a release of plastidal K + and an in crease of stromal H + concentration. The results indicate that external Mg2+ in the absence of EDTA does not influence neither photosynthetic electron transport nor photophosphorylation, but inhibits the light activation of some enzymes of the carbon reduction cycle. The latter is assumed to be due to an acidification of the stroma pH and the decrease of endogenous K + level. Since the chloroplast envelope has only a very low permeability towards Mg2+, possible mechanisms are discussed by which M g2+ changes the properties of the chloroplast envelope and thus secondarily induces the observed effects. | | |
Reference
| Z. Naturforsch. 34c, 233—241 (1979); received December 28 1978 | | |
Published
| 1979 | | |
Keywords
| Intact Chloroplasts, Chloroplast Envelope, Assimilation of C 0 2, Magnesium, Light Activation | | |
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| default:Reihe_C/34/ZNC-1979-34c-0233.pdf | | | Identifier
| ZNC-1979-34c-0233 | | | Volume
| 34 | |
18 | Author
| HorstW. Alter | Requires cookie* | | Title
| Permeability of Plasma Membrane Vesicles to Ouabain and Mg2+ as a Factor Determining Rate of Binding of Ouabain to Na+ and K+ Dependent ATPase  | | | Abstract
| N a+, K+-ATPase of the plasma membrane isolated from sheep kidney medulla exhibits functio nal asymmetry for the cardiac glycoside ouabain. In this vesicular membrane preparation the rate of binding o f ouabain was slow (time constant > 60 min) when the vesicles were incubated in the presence o f isotonic sucrose. Upon treatment o f the preparation with hypoosmotic shock or phos-pholipase A the initial rate of ouabain binding was enhanced at least 3 fold. In equilibrium a concentration of the ouabain-enzyme-complex was obtained which was about twofold that of the untreated vesicles. This result suggests two types o f ouabain binding sites with an approximate stoichiometry of 1 to 1. The stoichiometry seems to be maintained at high concentrations of ouabain where binding curves show a biphasic time course. Additional information about hetero geneity of binding sites comes through experiments in which the vesicles were treated with Mg2+ prior to the addition o f ouabain. A minor fraction of the binding sites were occupied by ouabain only after longtime incubation with Mg2+. | | |
Reference
| Z. Naturforsch. 34c, 1224 (1979); received July 13/August 18 1979 | | |
Published
| 1979 | | |
Keywords
| N a+, K+-ATPase, Plasma Membrane Vesicles, Cardiac Glycoside, Magnesium, Tightness | | |
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| default:Reihe_C/34/ZNC-1979-34c-1224.pdf | | | Identifier
| ZNC-1979-34c-1224 | | | Volume
| 34 | |
19 | Author
| M. Ichael Schmidt, Annette Schier, Hubert Schmidbaur | Requires cookie* | | Title
| Magnesium Bis[D(-)-Mandelate] Dihydrate and Other Alkaline Earth, Alkali, and Zinc Salts of Mandelic Acid  | | | Abstract
| , and zinc D(-)mandelates have been prepared from the parent mandelic acid and equivalent quantities (1:1 / 2:1) of the corresponding metal hydroxides in water. Colourless polycrystalline products are obtained from the aqueous solutions by evaporation of the solvent. The alkali, ammonium and strontium salts are anhydrous, the calcium and barium salts are monohydrates, the magne sium salt is a dihydrate, and the zinc salt a trihydrate. The crystal and molecular structure of the magnesium salt has been determined by single crystal X-ray diffraction methods (mono clinic, space group P2i, Z = 2). The lattice contains isolated complexes with hexacoordinate magnesium atoms chelated by two mandelate anions through one of their carboxylate oxygen atoms and the alcoholic hydroxyl group. Two water molecules in cis position are completing the octahedral coordination sphere. [MgtQITO^MfTO^] is thus a true mononuclear magnesium complex. Its stability and non-hygroscopic properties suggest its use as a magnesium and/or mandelate drug. | | |
Reference
| Z. Naturforsch. 53b, 1098—1102 (1998); received July 23 1998 | | |
Published
| 1998 | | |
Keywords
| Mandelic Acid, Magnesium Mandelate, Alkaline Earth Mandelates, Alkali Mandelates, Zinc Mandelate Lithium, sodium, potassium, ammonium, magnesium, calcium, strontium, barium | | |
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| default:Reihe_B/53/ZNB-1998-53b-1098.pdf | | | Identifier
| ZNB-1998-53b-1098 | | | Volume
| 53 | |
|