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81Author    Na2z, New Sodium, ZincateD. Trinschek, M. JansenRequires cookie*
 Title    Na2Zn02, ein neues Natriumzinkat  
 Abstract    By reacting Na20 , which was produced in situ from NaN3 and NaN02, with reactive ZnO in the solid state, the synthesis of Na2Z n02 has been achieved. Na2Zn02 is metastable up to about 750°C. The novel sodium zincate crystallizes in the spaceogroup P2,/c (No. 14) with the lattice parameters a = 7.7352(2), b = 5.9782(2), c = 5.7248(2)Ä, ß = 94.934(3)°, Z = 4. According to a single crystal structure determination it is an representative of the anti type of the Ln2S20 (Ln = Er, Tm, Yb, Dy) structure. 
  Reference    Z. Naturforsch. 51b, 711—714 (1996); eingegangen am 10. August 1995 
  Published    1996 
  Keywords    Sodium Zincates, Crystal Structure, Metastability 
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 Identifier    ZNB-1996-51b-0711 
 Volume    51 
82Author    Z. NaturforschRequires cookie*
 Title    A -P r 2S3, D -H o2S3 und E -Y b 2S3: Synthese und Einkristallstrukturuntersuchungen  
 Abstract    The oxidation of reduced chlorides (MC12) or chloride-hydrides (MC1HV) of the lanthani­ des with sulfur (700-850 °C, 7 d, sealed tantalum capsules or evacuated silica vessels) usually results in the formation of the sesquisulfides M2S3 as the main products. In the presence of appropriate fluxes (e.g., alkali halides), the products often are obtained as single crystals, and the flux decides which modification is favoured. Ternary halides of the trivalent lanthanides with the corresponding alkali metal can mostly be found as the second components. Crystal growth and structural investigations of thus produced single crystals of Pr2S3 (from PrClH() 67 + S + NaCl, 5:5:1, A type: orthorhombic, Pnma (No. 62), Z = 4, a = 748.22(5), b = 405.51(3), c = 1560.74(9) pm, R = 0.024, Rw = 0.020), Ho^S, (from U -H o^S , + KI, 1:1, D type: mono­ clinic, P 2xim (No. 12), Z = 6, a = 1746.15(9), b = 400.23(3), c = 1012.43(6) pm, ß = 98.529(4)°, R = 0.041, Rw = 0.035), and YbiS3 (from T-Yb^S^ + KI, 1:1, E type: trigonal, R 3c (No. 167), Z = 6, a = 674.97(2), c = 1820.11(9) pm'. R = 0.019, Rw = 0.018) are reported here. In accordance with the lanthanide contraction, the trivalent cations (M3+) exhibit sulfur coordination numbers of 7 and 8 in A -P r 2S3, 6 and 7 in D -H o 2S3, and 6 in E -Y b 2S3 (corundum-type structure). 
  Reference    Z. Naturforsch. 51b, 733—738 (1996); eingegangen am 4. Oktober 1994 
  Published    1996 
  Keywords    Lanthanides, Sesquisulfides, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-0733 
 Volume    51 
83Author    H. V., A. Fischerb, P. G. JonesbRequires cookie*
 Title    Eine unerwartete Synthese des Triphenyphosphazenium-chlorids, [(C6H5)3PNH2]+CI_ und eine Neubestimmung seiner Kristallstruktur  
 Abstract    Triphenylphosphazenium chloride has been prepared by the reaction of triphenylphos-phine with trimethylsilylazide in impure, wet dichloromethane. Yields are improved as stoi­ chiometric quantities of w ater are added. Colourless crystals are obtained by recrystallization from the same solvent. The crystals are triclinic, space group P I, Z=2, a = 894,6(3), b -979,8(3), c = 1142,9(4) pm, a = 107,27(3), ß = 93,70(3), y = 92,97(3)°. In the solid state the compound exists as [(C6H 5)3PNH2]+ cations, and Cl-anions. Dimeric units are formed by H-bonding. The crystal structure contains one molecule CH 2C12 per one molecule (C6H 5)3PNH2C1. The cation has a slightly irregular tetrahedral geometry around the P-atom with a relatively short P-N bond. 
  Reference    Z. Naturforsch. 51b, 865—868 (1996); eingegangen am 21. O ktober 1995 
  Published    1996 
  Keywords    Triphenylphosphazenium Chloride, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-0865 
 Volume    51 
84Author    N. Stock, W. SchnickRequires cookie*
 Title    Synthese, Kristallstruktur und Eigenschaften von l,l>3 ?3 ?3 -Pentaam*n° -l  
 Abstract    oxo-lA 5 ,3A 5 -diphosphaz-2-en, (NH2)2 (0)P-N=P(NH2)3 Synthesis, Crystal Structure, and Properties of 1,1,3,3,3-Pentaam ino-l-oxo-l A 5 , 3 A 5 -diphosphaz-2-ene, (NH2)2(0)P-N =P(N H i)3 Coarse crystalline (NH2)2(0)P-N=P(NH2)3 is obtained from a NH;* saturated CH2C12 suspen­ sion of (NH2)2(0)P-N=P(NH2)3 NH4C1 at room temperature. (NH2)2(0)P-N=P(NH2)3 NH4C1 is synthesized" by slow addition of C12(0)P-N=PC13 to a solution of NH3 in CH2C12 at -78 °C. Excess NH4C1 is removed by treatment with HNEt2 followed by extraction with CH2C12. The crystal structure of (NH2)2(0)P-N=P(NH2)3 has been determined by single crystal X-ray methods (P2(/c; a = 1462.8(3), b = 944.8(2), c = 1026.9(2) pm, /3 = 110.69(3)°; Z = 8). In the unit cell there are two crystallographically unique molecules. They form a three dimensional network by intermolecular hydrogen bonding interactions (N-H- • N > 313 pm. N-H • 0 > 293 pm). The investigation of the thermal properties shows decomposition with evolution of NH3 above 80 °C. 
  Reference    Z. Naturforsch. 51b, 1079—1083 (1996); eingegangen am 7. Dezember 1995 
  Published    1996 
  Keywords    Aminophosphazene, Synthesis, Crystal Structure Precursor 
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 Identifier    ZNB-1996-51b-1079 
 Volume    51 
85Author    Wolfgang Czado, Ulrich MüllerRequires cookie*
 Title    (PPh4)4Sb8Br28 Tetraphenylphosphonium Ikosioctabromooctaantimonate(III), (PPh4)4Sb8Br28  
 Abstract    The title compound was obtained by the reaction of PPh4Br, Sb2Se3, and bromine in dichloro-methane. Its crystal structure was determined by X-ray diffraction. Crystal data: a = 1249.1(2), b = 1307.8(2), c = 2152.3(4) pm, a = 102.93(2), ß = 100.83(2), 7 = 100.42(2)°, Z = 2, triclinic, space group P I . (PPh4)4Sb8Br28 is isotypic with (PPh4)4Sb8I28. The Sb8Br284~ ion can be taken as the association product of eight SbBr3 molecules with four B r-ions. Each Sb atom has a distorted octahedral coordination with three shorter (252 to 274 pm) and three longer (300 to 353 pm) Sb-Br bonds. The octahedra share common edges in two parallel rows of four octahedra each. The arrangement of the 28 bromine atoms corresponds to a section of a closest packing of spheres. Tetraphenylphosphonium-ikosioctabromooctaantimonat(III), 
  Reference    Z. Naturforsch. 51b, 1245—1247 (1996); eingegangen am 22. März 1996 
  Published    1996 
  Keywords    Ocataikosabromooctaantimonate, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-1245 
 Volume    51 
86Author    Joachim Pickardt, B. Ritta KühnRequires cookie*
 Title    Metallkomplexe mit Guanidinderivaten als Liganden  
 Abstract    Kristallstrukturen von [Zn(cnge)2(SCN)2] 2H20 und Zn(eoge)Br2 (enge = Cyanoguanidin; eoge = 1-Ethoxyiminomethylguanidin) M etal C om plexes with G uanidine D erivatives as Ligands: Crystal Structures o f [Zn(cnge)2(SC N)2]-2H20 und Z n(eoge)B r2 (cnge = C yanoguanidine; eoge = 1-Ethoxyim inom ethylguanidine) Crystals of |Zn(cnge)2(SCN)2]-2H20 (1) were obtained by evaporation of an aqueous solution 
  Reference    Z. Naturforsch. 51b, 1469—1472 (1996); eingegangen am 3. April 1996 
  Published    1996 
  Keywords    Cyanoguanidine, Zinc Complexes, Crystal Structures 
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 Identifier    ZNB-1996-51b-1469 
 Volume    51 
87Author    StefanH. Orstm, AnnW. Olfgang SchnickRequires cookie*
 Title    Synthese  
 Abstract    , K rista llstru k tu r und Eigenschaften von 1 ,1 , 1 > 3 * 3 , 3 -H e x a a m i n o -lA 5,3A5-diphosphazenium ehlorid[(N H 2)3PNP(NH2)3]Cl Synthesis, C rystal Structure, and Properties of 1,1,1,3,3,3-Hexaam ino-1 A5,3A5-diphosphazenium Chloride [(N H 2)3PN P(N H 2)3]C1 [(NH2)3PNP(NH2)3 ]C1 has been prepared by a three step synthesis. The last step is the ammo-nolysis of [C13PNPC13]C1. Single crystals of 1,1,1,3,3,3-hexaamino-1 A \ 3As-diphosphazenium chloride were obtained from an acetonitrile solution in a temperature gradient between 60 °C and room temperature. Between room temperature and -1 0 0 °C [(NH2)3PNP(NH2)3]C1 is sub­ ject to a phase transition. Therefore, the crystal structure was determined by single crystal X-ray methods at room temperature (P i, a = 584.7(1) pm, b = 732.1(1) pm, c = 1092.0(2) pm. q = 71.05(3)°, ß = 76.36(3)°, 7 = 89.83(3)°, Z = 2, R = 4.75 %, wR = 2.47 %). The cation [(NH2)3PNP(NH2)3]+ is built up by two corner sharing PN4 tetrahedra. Remarkably short P-N bonding distances have been observed and both PN4 tetrahedra exhibit a significant distortion resulting in two large and four small N-P-N bond angles. 
  Reference    Z. Naturforsch. 51b, 1732—1738 (1996); eingegangen am 26. Juni 1996 
  Published    1996 
  Keywords    Aminophosphazenes, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-1732 
 Volume    51 
88Author    G. Rebe, Frank Weller, Kurt Dehnicke, ProfRequires cookie*
 Title    Jutta  
 Abstract    N-Iodo-triphenylphosphaneimine, Ph3PNI, has been prepared by thermolysis of the donor acceptor complex [Me3SiNPPh3-ICl] in boiling acetonitrile in the presence of potassium fluo­ ride. Both compounds have been characterized by IR spectroscopy and by crystal structure determinations. [Me3SiNPPh3 ICl]: Space group P I, Z = 2, a = 888.3(1), b = 1070.7(1), c = 1310.2(1) pm, a = 9 5 .15(1)°, ß = 108.67(1)°, 7 = 97.78(1)° at 20°C. The complex has a molecular structure in which the N atom of the phosphaneimine is connected with the iodine atom of the IC1 molecule in a linear arrangement N-I-Cl with bond lengths N-I = 232.7 pm, I-Cl = 255.37 pm. Ph3PNI: Space group P2,/n, Z = 4, a = 952.8(1), b = 1800.8(2), c = 1003.6(1) pm, ß = 110.25(1)° at -50°C. The compound forms monomeric molecules with bond lengths PN = 159.1 pm, I-N = 205.6 pm and an INP bond angle of 113.3°. N-Iod-triphenylphosphanimin. Synthese und Kristallstrukturen von [Me3SiNPPh3 ICl] und Ph3PNI 
  Reference    Z. Naturforsch. 51b, 1739—1743 (1996); eingegangen am 12. April 1996 
  Published    1996 
  Keywords    Phosphaneimine Complexes, Synthesis, Crystal Structure 
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 Identifier    ZNB-1996-51b-1739 
 Volume    51 
89Author    Christian Meyer3, Dietrich Mootza, Birgit Bäckb, Rolf MinkwitzbRequires cookie*
 Title    Bis(trifluormethyl)disulfan und -trisulfan: Molekülgeometrie im festen Zustand [1] Bis(trifluoromethyl)disulfane and Trisulfane: Molecular Geometry in the Solid State [1]  
 Abstract    The solid-state structures of the low-melting compounds bis(trifluoromethyl)disulfane (CF3SSCF3, triclinic, space group P I, Z = 2) and bis(trifluoromethyl)trisulfane (CF3SSSCF3, monoclinic, space group C2/c, Z = 4) have been determined on single crystals with M oK a radiation at -160°C. The trisulfane has trans conformation. The geometry of both molecules agrees well with results of electron diffraction on the gaseous state. A comparison is made also with the crystal structures of the related molecules CF3TeTeCF3 and CF3OOOCF3. 
  Reference    (Z. Naturforsch. 52b, 69—71 [1997]; eingegangen am 15. Juli 1996) 
  Published    1997 
  Keywords    Conformation, Crystal Structure, Sulfane 
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 Identifier    ZNB-1997-52b-0069 
 Volume    52 
90Author    OctahedraC. Wadewitz, Hk Müller-BuschbaumRequires cookie*
 Title    Ba  
 Abstract    (V0)4(As0 4)2(As20 7): Ein neues Divanadyl(IV)-Arsenat mit flächenverknüpften V20 8+1-Oktaederdoppeln Ba(V0)4(As0 4)2(As20 7): A New Divanadyl(IV)-Arsenate Containing Face Shared V20 8+, Double A new alkaline earth vanadyl arsenate Ba(V0)4(As0 4)2(As2 0 7) has been synthesized by solid state reactions in closed quartz tubes. X-ray investigations led to orthorhombic symmetry, space group D2£-Pnma, a = 17.540(2), b = 7.6223(8), c = 11.0633(12) A, Z = 4. The crystal structure is characterized by A s 0 4 single and As20 7 double tetrahedra and face shared asymmetric stretched V20 8+, double octahedra, forming a network of polyhedra. The incorporated Ba2+ ions show 12-fold coordination by oxygen. Ba(V 0)4(A s0 4)2(As20 7) is the first vanadyl compound containing V20 8 divanadyl groups originating from face sharing stretched V 0 5+l octahedra. 
  Reference    (Z. Naturforsch. 52b, 83—87 [1997]; eingegangen am 21. August 1996) 
  Published    1997 
  Keywords    Barium, Vanadyl Arsenate, Crystal Structure 
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 Identifier    ZNB-1997-52b-0083 
 Volume    52 
91Author    Z. NaturforschRequires cookie*
 Title      
 Abstract    The crystal structures of PbMe3I and BiPh2Cl have been determined by X-ray methods. Both compounds form polymeric chains via bent [i2-ha-logeno bridges and almost linear X-M-X units (X = I, Cl). 
  Reference    Z. Naturforsch. 52b, 149—152 (1997); eingegangen am 20. September 1996 
  Published    1997 
  Keywords    Lead, Bismuth Compounds, Crystal Structure 
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 Identifier    ZNB-1997-52b-0149_n 
 Volume    52 
92Author    Amo Pfitzner, Eva FreudenthalerRequires cookie*
 Title    (CuI)2Pi4* ein neues Phosphorpolymer in einer Kupferhalogenid-Matrix (CuI)2P 14: a Novel Phosphorus Polymer in a Copper Halide Matrix  
 Abstract    (CuI)2Pi4 is a new adduct of copper iodide to a neutral phosphorus polymer. It is obtained by reaction of Cul and Pred at 400 °C. The compound crystallizes monoclinically, space group P2,/c (No. 14), a = 9.919(2), b = 9.718(2), c = 16.478(3) Ä, ß = 105.71(1)°, V = 1529.0(7) A3, with Z = 4. The crystal structure was refined to R\ = 0.029 for 2680 reflections and 173 parameters. It contains a new polymeric phosphorus allotrope with the translational unit P^° consisting of experimentally unknown [PI2] groups which are linked by [P2] fragments. The phosphorus rods consist of five-and six-membered rings, and are coordinated only by copper atoms. 
  Reference    Z. Naturforsch. 52b, 199—202 (1997); eingegangen am 11. September 1996 
  Published    1997 
  Keywords    Phosphorus, Copper Compounds, Crystal Structure 
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 Identifier    ZNB-1997-52b-0199 
 Volume    52 
93Author    Olaf Reckeweg, H.-Jürgen MeyerRequires cookie*
 Title    Unsymmetrische BN23'-Ionen in den Strukturen von Ca2ClBN2 und Sr2ClBN2. Unsymmetric BN23~-Ions in the Structures of Ca2ClBN2 and Sr2ClBN2  
 Abstract    The new compounds Ca2ClBN2 (1) and Sr2ClBN2 (2) were prepared from the respective metal, its dihalide and h-BN in sealed tantalum ampoules at 1200 °C. The crystals obtained were transparent yellow (1) and blue (2), respectively. The crystal structures were determined from single crystal X-ray data. Ca2ClBN2 and Sr2ClBN2 are isotypic and crystallize in the orthorhombic space group Pnma (No. 62), Z = 4 (Ca2ClBN 2: a = 1166.7(2), b = 390.26(4), c = 899.8(1) pm, R 1 = 0.043, wR2 = 0.115 for 554 independent reflections; Sr-,C1BNT: a = 1242.8(1), b = 416.75(4), c = 920.8(1) pm, R\ = 0.031, wR2 = 0.054 for 6 6 2 'independent reflections). The structures contain two different layers of M 2+, C P and BN23~ alternating along the [010] direction. The bond angles N-B-N are 177.2(4)° for (1) and 176,6(5)° for (2), the bond distances of the BN23_ ions are dB_ N] = 134.6(5) pm for (1), 136,3(7) pm for (2) and dg_N2 = 132.4(5) pm for (1) and 131,3(7) pm for (2). The unsymmetric structure of the BN23~ ion, as is manifested particularly in the Sr compound (2), is caused by the coordination of N 1 to four cations while N2 is coordinated only to three. 
  Reference    Z. Naturforsch. 52b, 340—344 (1997); eingegangen am 12. November 1996 
  Published    1997 
  Keywords    Boronitrides, Synthesis, Crystal Structure 
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 Identifier    ZNB-1997-52b-0340 
 Volume    52 
94Author    Uwe Klingebiel, Mathias Noltemeyer, Hans-Jörg RakebrandtRequires cookie*
 Title    Difluorphosphorylcyclosilazane -Synthese und Kristallstruktur Difluorophosphorylcyclosilazanes -Syntheses and Crystal Structure  
 Abstract    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). 1,5-Bis(difluorophosphanyl)-2,2,4,4,6,6,8,8-octamethyl-cyclotetrasilazane (2) is obtained in the reaction of the dilithium derivative of the cyclic tetrasilazane with trifluorophosphane in a molar ratio 1:2. The crystal structure of (F2P-N-SiMe2-NH-SiMe2)2 (2) has been determined. 
  Reference    Z. Naturforsch. 52b, 775—777 (1997); eingegangen am 14. April 1997 
  Published    1997 
  Keywords    Fluorophosphorylcyclosilazanes, Silicon, Crystal Structure 
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 Identifier    ZNB-1997-52b-0775 
 Volume    52 
95Author    Pb2ln2si209, J.-P Werner, Hk Müller-BuschbaumRequires cookie*
 Title    Zur Kenntnis eines synthetischen Kentrolits/Melanotekits des Indiums: On an Synthetic Kentrolite/Melanotekite of Indium: Pb2In2Si20 9  
 Abstract    Single crystals of Pb2In2Si20 9 have been prepared by crystallisation from melts of Pb(N 03)2, ln20 3 and S i0 2. The compound crystallizes with orthorhombic symmetry, space group C2v-Pna2| with the lattice constants a = 10.529(1),/?= 11.372(1) and c = 7.019(3) A, Z = 4. Despite the fact that the Kentrolite/Melanotekite structure is characterized by dissimilar occupied split positions of lead, Pb2In2Si20 9 shows completely filled and ordered point positions. The location of a dot like lone pair of Pb~+ is estimated by Coulomb term calculations of lattice energy. The results are discussed with respect to published Pb-lone pair distances using the electronic polarizability coefficient of the lone pair cation or simple geometrical considerations. 
  Reference    Z. Naturforsch. 52b, 1213—1218 (1997); eingegangen am 8. Juli 1997 
  Published    1997 
  Keywords    Lead, Indium, Silicate, Crystal Structure 
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 Identifier    ZNB-1997-52b-1213 
 Volume    52 
96Author    Stefan DickRequires cookie*
 Title    Die Struktur von GaAs0 4 *2 H20 : Ein neues Mitglied der Variscit-Familie The Structure of GaAsC>4-2 H20 : A New M ember of the Variscite Family  
 Abstract    GaAs0 4 -2 FF0 was synthesized hydrothermally from Ga2Ü3 and a K+-AsC>4~ solution at pH=2. A single crystal structure determination showed that GaAs0 4 -2H20 is isotypic with variscite and therefore the first gallium arsenate with octahedrally coordinated Ga(III). Crys­ tal data: space group Pbca, a = 1016,0(1), b = 886,2(1), c = 994. 1(1) pm, R g = 0,0266. GaAs0 4 -2 H2 0 dehydrates at 439 K with formation of an amorphous material and poor cry­ stalline GaAsC>4. The crystal data of all known compounds with variscite structure have been compiled. 
  Reference    Z. Naturforsch. 52b, 1337—1340 (1997); eingegangen am 27. Juni 1997 
  Published    1997 
  Keywords    Gallium Arsenate, Crystal Structure, Variscite 
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 Identifier    ZNB-1997-52b-1337 
 Volume    52 
97Author    Hk Wulff, Müller-BuschbaumRequires cookie*
 Title    Synthese und Kristallstruktur des Lanthan-Titanat-Tellurats LaTi  
 Abstract    (Ti0 2 5Te0j 5)O6 und seine Verwandtschaft mit PbSb20 6 und Sr(MnTe)06 Synthesis and Crystal Structure of the Lanthanum Titanate Tellurate LaTi(Ti0 25Te0 75) 0 6 and its Relationship to PbSb20 6 and Sr(M nTe)06 L. Single crystals of LaTi(Ti0 25T e o .75) 0 6 have been prepared by solid state reactions. X-ray investigations led to trigonal symmetry, space group C3-P3 , a = 5.141(10), c = 5.218(10) A, Z = 1. The compound is characterized by a predominantly ordered distribution of Ti4+ and Te6+. Typical features of the crystal structure are staggered layers containing edge connected T i0 6 and (Ti,Te)06 octahedra. The layers are connected by La3+ ions receiving an octahedral coordination by the surrounding oxygen ions. The relationships to the PbSb20 6 type and the recently described compound Sr(M nTe)06 are discussed. 
  Reference    Z. Naturforsch. 53b, 149—152 (1998); eingegangen am 25. November 1997 
  Published    1998 
  Keywords    Lanthanum, Titanate, Tellurate, Crystal Structure 
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 Identifier    ZNB-1998-53b-0149 
 Volume    53 
98Author    G. Waidmann, M. JansenRequires cookie*
 Title    Synthese und Charakterisierung des Fulleren-Kokristallisats C60*SiH(C6H5)3 Synthesis and Characterisation of the Fullerene Co-Crystal C60*SiH(C6H5)3  
 Abstract    A new fullerene co-crystal C60*SiH(C6H5)3 has been synthesized by crystallisation from a melt of SiH(C6H5)3 and C60 in sealed duran tubes at 80°C. X-ray investigations led to triclinic symmetry, space group P i, a = 10.086(1),/? = 14.431(2), c = 14.911(2) Ä, a = 79.13(1), ß = 74.943(9), 7 = 88.33(1)°, V = 2058.0(4) A 3, Z = 2. The crystal structure consists of isolated fullerene and silane molecules. At -80°C, C60 is still rotationally disordered. Temperature dependent Guinier powder diagrams do not show any phase transformation between 25 and -165°C. The compound is stable in air. 
  Reference    Z. Naturforsch. 53b, 161—164 (1998); eingegangen am 14. November 1997 
  Published    1998 
  Keywords    Fullerene C60, Synthesis, Crystal Structure 
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 Identifier    ZNB-1998-53b-0161 
 Volume    53 
99Author    Ratikanta Mishra, Rolf-Dieter Hoffmann, Rainer PöttgenRequires 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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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0239.pdf 
 Identifier    ZNB-2001-56b-0239 
 Volume    56 
100Author    N. O. Rb, E. Rt, W. M. Itzel, Christian LustigRequires cookie*
 Title    Crystal Structure of a Lithium Chloride Cubane Cluster Solvated by Diethyl Ether  
  Reference    Z. Naturforsch. 56b, 443 (2001); received March 2 2001 
  Published    2001 
  Keywords    Lithium Chloride, Aggregation, Crystal Structure 
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 TEI-XML for    default:Reihe_B/56/ZNB-2001-56b-0443_n.pdf 
 Identifier    ZNB-2001-56b-0443_n 
 Volume    56 
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