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61	Author	Marcos Luján, Frank Kubel, Hans Schmid	Requires cookie*
	Title	Crystal Growth, Room Temperature Crystal Structure and Phase Transitions of K M nP04
	Abstract	Single crystals of K M nP 04 grown in a KC1 flux show ferroelastic domains. The structure was determ ined on an optically controlled single domain crystal by X-ray diffraction methods. The cell is triclinic with dimensions a = 5.4813(5), b = 8.627(1), c = 8.887(1), in A, a = 87.73(1)°, ß = 89.10(1)°, y = 88.01(1)°, VM = 419.6(1) A 3 and Z = 4. The structure is closely related to the stuffed /3-tridymite type. DTA experiments between room tem perature and 1000 °C and polarized light microscopy observations showed four phase transitions: at 165, 330, 353 and 707 °C.
	Reference	Z. Naturforsch. 50b, 1210—1214 (1995); received February 20 1995
	Published	1995
	Keywords	Manganese Potassium Orthophosphate, Crystal Structure, Crystal Growth, Phase Transitions
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	Identifier	ZNB-1995-50b-1210
	Volume	50

62	Author	Z. Naturforsch	Requires cookie*
	Title	In2.24(NCN)3 and NaIn(NCN)2: Synthesis and Crystal Structures of New Main Group Metal Cyanamides
	Abstract	Single crystals of In2.24(N C N)3 and N aIn(N C N)2 can be synthesized from a reaction be tween InBr and NaCN at 400 °C, followed by chemical transport at 4 0 0 -5 0 0 °C. The X-ray crystal structure determinations of In2.24(N C N)3 (rhombohedral R 3c, a = 606.09(4), c -2884.4(2) pm, Z = 6) and N aIn(N C N)2 (orthorhombic Cmcm, a = 961.30(6), b = 716.84(5), c = 603.65(4) pm, Z = 4) reveal ionic layer structures built from sheets of cationic and anionic (cyanamide) motifs. While N aIn(N C N)2 contains In3+ and N a+ ions, In2 24(N C N)3 is a mixed-valence compound, incorporating a m onovalent In+ ion besides trivalent indium. The N CN 2~ units of both In2,24(N C N)3 and N aIn(N C N)2 reflect perfect D xll point group symmetry within the limits of experimental accuracy. Furthermore, an evaluation of all presently available crystallographic data on metal cyanamide crystal structures manifests that there is no evi dence for a non-centrosymmetric description o f any of these. Likewise, we propose an alter native centrosymmetric structural model for lead cyanamide, PbNCN, and question the evi dence of the unsymmetrical, non-D xh shaped cyanamide anion in the latter structure.
	Reference	Z. Naturforsch. 50b, 1245—1251 (1995); received April 11 1995
	Published	1995
	Keywords	Indium Cyanamide, Indium Sodium Cyanamide, Crystal Structure, Cyanamide Molecular Symmetry
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	Identifier	ZNB-1995-50b-1245
	Volume	50

63	Author	E. Peters, Hk Müller-Buschbaum	Requires cookie*
	Title	Synthese eines Pyrochlors mit Ti11: (Tao^Ti1o,33)2Sm20 7 Synthesis of a Pyrochlore Containing Ti11
	Abstract	High temperature reactions using a C 0 2-LA SER led to a Ti11 containing phase o f the com position (T ao^yT i^^^Sn^O y, space group O 7 -Fd3m (No. 227), a = 10.385(2) Ä . The oxidation state Ti11 which is stabilized by incorporation into the cubic pyrochlore structure was proved by the statistical occupation of the 16c
	Reference	Z. Naturforsch. 50b, 1340—1342 (1995); eingegangen am 2. Mai 1995
	Published	1995
	Keywords	Titanium(II), Tantalum, Rare Earth, Oxide, Crystal Structure
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	Identifier	ZNB-1995-50b-1340
	Volume	50

64	Author	Abdel-Fattah Shihada, Frank Wellerb	Requires cookie*
	Title	Synthesis, Vibrational Spectra, Mass Spectrum and Crystal Structure of Tri-n-butyltin Diphenylphosphinate (n-Bu)3S n 0 2PPh2
	Abstract	Tri-/?-butyltin diphenylphosphinate (/?-Bu)3S n 0 2PPh2 has been synthesized by the reaction o f («-B u 3Sn)20 with Ph2POCl in toluene. An X-ray diffraction study of (/?-Bu3) S n 0 2PPh2 shows that the structure is polymeric and consists of helical chains in which (/7-Bu)3Sn groups are linked by O-P-O bridges. The geometry about tin is trigonal bipyramidal, with «-butyl groups in equatorial positions and an axial O -S n -O angle of 176.2 (2)°. IR and Raman spectra of («-B u)3SnÖ2PPh2 are given and assigned. The mass spectrum is reported and discussed.
	Reference	Z. Naturforsch. 50b, 1343—1347 (1995); received D ecem ber 12 1994
	Published	1995
	Keywords	Crystal Structure, Vibrational Spectra, Mass Spectrum, Tri-n-butyltin Diphenylphosphinate
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	Identifier	ZNB-1995-50b-1343
	Volume	50

65	Author	Frank Steffen, G. Erd, Meyer	Requires cookie*
	Title	[Er14(C2)2 (N )2 ] l24 -ein Iodid mit einem oligom eren, heterointerstitiellen Cluster [E r14(C2)2(N)2]l24 -an Iodide with an Oligomeric, H eterointerstitial Cluster
	Abstract	[Er14(C2)2(N)2]l24 (triclinic, P I, a = 966.3(4) pm. b = 1027.6(2) pm. c = 1663.4(4) pm, « = 101.374(9)°, ß = 92.853(14)°, y = 112.83(2)°, Z = 2) is obtained as red-brown single crystals through a conproportionation reaction of E rl3 and erbium in the presence of carbon and N aN 3 in a sealed niobium container. It contains discrete, tetrameric [Er14(C2)2(N)2] clusters that are built from two octahedra and two tetrahedra connected via com mon edges. The octahedral voids are filled with C2 units and the tetrahedral voids with N atoms. Each discrete [Erj4(C2)2(N)2] cluster is surroun ded by 32 iodide ligands which connect six clu sters via i-a and a-a bridges.
	Reference	Z. Naturforsch. 50b, 1570—1573 (1995); eingegangen am 7. April 1995
	Published	1995
	Keywords	Rare Earth Elements, Halides, Cluster, Erbium Iodide Dicarbide Nitride, Crystal Structure
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	Identifier	ZNB-1995-50b-1570_n
	Volume	50

66	Author	Anne Utzolino, Karsten Bluhm	Requires cookie*
	Title	Cox 5Ti0 5(B 0 3) 0 and Co! 5Zro.5(B 0 3) 0
	Abstract	Single crystals of Co15Tio.5(B 0 3)0 (I) and Coj 5Zr0 5(BO3)O (I I) were obtained by a B20 3 flux technique. Both compounds crystallize with orthorhombic symmetry, space group D -Pnma (Nr. 62), I a = 928.1; b = 311.1; c = 940.1 pm; Z = 4 and I I a = 949.5; b = 323.42; c = 934.7 pm; Z = 4. The compounds are isotypic to the mineral warwickite. All metal ions are octahedrally coordinated by oxygen ions. The structure contains isolated, trigonal planar B 0 3 units and oxygen that is not coordinated to boron. Die Synthese und Kristallstruktur von cobalthaltigen Boratoxiden: Coi^Tio,5(B03)0 und C o i?5Zr<),5(B03)0
	Reference	Z. Naturforsch. 50b, 1653—1657 (1995); eingegangen am 4. Mai 1995
	Published	1995
	Keywords	Cobalt, Titanium, Zirconium, Borate Oxide, Crystal Structure, X-Ray
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	Identifier	ZNB-1995-50b-1653
	Volume	50

67	Author	Oliver Seidelmann, Lothar Beyer, Rainer Richter	Requires cookie*
	Title	N,N-Disubstituierte N'-Ferrocenoylthioharnstoffe als zweizähnige Komplexliganden für Übergangsmetallionen. Kristallstruktur von Bis-(N,N-diethyl-N'-ferrocenoylthioureato)nickel(II) N,N-Disubstituted N'-Ferrocenoyl Thioureas as Bidentate Ligands for Transition Metal Ions. Crystal Structure of Bis-(N,N-diethyl-N'-ferrocenoylthioureato)nickel(II)
	Abstract	N,N-diethyl-N'-ferrocenoyl-thiourea and N-(morpholino-thiocarbonyl)ferrocenecarboxylic amide have been prepared by the reaction of ferrocenoyl chloride with potassium thiocyanate and the respective amine in dry acetone. These bidentate ligands yield neutral heterometal-lic complexes with Ni(II), Cu(II), Mn(II) and Co(III). The dark brown air stable crystals of bis-(N,N-diethyl-N'-ferrocenoylthioureato)nickel(II) were characterized by X-ray structure de termination. Lattice dimensions: a = 1870.9(1), b = 1161.5(1), c = 1491.4(1) pm; space group Pca2!, Z = 4, R = 0.030 for 5707 observed reflections.
	Reference	Z. Naturforsch. 50b, 1679—1684 (1995); eingegangen am 23. März 1995
	Published	1995
	Keywords	Ferrocene Complexes, Thiourea, Hetero Metal Complexes, Synthesis, Crystal Structure
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	Identifier	ZNB-1995-50b-1679
	Volume	50

68	Author	Z. Naturforsch	Requires cookie*
	Title	Com plex F orm
	Abstract	ation and M etal E x tractio n with H eterocyclic /3-Dicarbonyl C om pounds as C om parison. S tru ctu re of 3-Phenyl-4-benzoyl-5-isoxazolone E rh ard U hlem ann*, A lw in Friedrich, G erald H insche, W ulfhard M ickler, Acid constants and stability constants of nickel and zinc chelates with 2-thenoyltrifluoro-acetone, dibenzoylmethane, l-phenyl-3-methyl-4-benzoyl-5-pyrazolone and 3-phenyl-4-ben-zoyl-5-isoxazolone were compared. The extraction of copper was studied. Thermoanalytic measurements were made using the ligands and their copper compounds in the solid state. The molecular structure of 3-phenyl-4-benzoyl-5-isoxazolone was determined by X-ray analy sis. Crystal data: a = 874,7(2), b = 1959,2(7), c = 897,38(7) pm; ß = 101,030(7)°; space group P 12j/c 1; Z = 4; R = 0,043; 1920 observed, unique reflexions.
	Reference	(Z. Naturforsch. 50b, 37—42 [1995]; eingegangen am 11. Juli 1994)
	Published	1995
	Keywords	3-Phenyl-4-benzoyl-5-isoxazolone, Crystal Structure, Thermal Stability, Complex Stability Constants, Dioxane/Water-Mixtures
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0037.pdf
	Identifier	ZNB-1995-50b-0037
	Volume	50

69	Author	Michael Born, Dietrich Mootz, Sigrid Schaefgen	Requires cookie*
	Title	Tautomere Wasserschichten. Bildung und Struktur tiefschmelzender Trihydrate von Triethylamin und 4-Methylpyridin [1] Tautomeric Water Layers. Formation and Structure of Low-Melting Trihydrates of Triethylamine and 4-Methylpyridine [1]
	Abstract	Low-melting trihydrates of triethylamine (E t3N) and 4-methylpyridine (4-M ePy) have been confirmed and detected by phase analysis and the crystal structures determined. Both are monoclinic with space group P 2!/c and Z = 4 formula units per unit cell. The lattice parameters are a = 13.606, b = 6.291, c = 12.412 A , and ß = 99.47° at -1 0 0 °C for Et3N -3 H 20 , and a = 9.982, b = 6.877, c = 12.958 Ä , and ß = 103.50° at -9 0 °C for 4-M eP y-3 H20 . The water m olecules in the two structures are hydrogen-bonded in condensed four-, five-, and six-membered rings with 1:2:1 ratio, thus forming characteristic layers parallel (1 0 0) of identical topology and tautomeric to each other. The amine m olecules are linked to both sides of the layers by O -H — N bonds from different O atoms.
	Reference	(Z. Naturforsch. 50b, 101—105 [1995]; eingegangen am 11. August 1994)
	Published	1995
	Keywords	Am ine Hydrates, Crystal Structure, Hydrates, Hydrogen Bonding, M elting Diagram, Water Layers
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0101.pdf
	Identifier	ZNB-1995-50b-0101
	Volume	50

70	Author	AndreasF. Stange, Eberhard Waldhör, Michael Moscherosch, Wolfgang Kaim	Requires cookie*
	Title	Variable Structure of the Cu2S2 Core in Doubly Thiolate-Bridged Dicopper(I) Complexes. An X-Ray Crystallographic, Electrochemical and EPR Study of (dmp)2 (o-CH3 C6H4S)2Cu2 , dmp = 2,9-Dimethyl-l,10-phenanthroline, and a Comment on the Nature of Phenanthroline-Containing "Cu(0)" Complexes
	Abstract	The molecular and crystal structure of the dicopper(I) complex (dm p)2(M-o-CH3C6H4S)2Cu2 (1), dmp = 2,9-dim ethyl-l,10-phenanthroline, has been deter mined. With Cu/S/Cu and S/Cu/S bond angles between 80 and 100°, the planar structure of the central CuSCuS four-membered ring is much more symmetric for 1 as compared to the analogous complex 2 of unsubstituted 1,10-phenanthroline which has a folded Cu2S2 core with bond angles between 67 and 108°. This result illustrates a considerable structural flexi bility of the LCu(m-SR)2CuL entity which is being discussed as a possible model for CuA centers of cytochrome c oxidase or nitrous oxide reductase. Oxidation of both com plexes 1 and 2 remains irreversible even at cyclovoltammetric scan rates o f 1 V/s. However, the methyl substitution in complex 1 causes increased reversibility of the electronically coupled dmp-based reduction processes. Accordingly, the EPR spectrum of l -* is characterized by hyper-fine splitting from dmp--and a relatively small 63 " Cu coupling of 0.53 mT. The stabilization of 2,9-disubstituted 1,10-phenanthroline radical anions by coordination to Cu(I) is also dem onstrated by detection of a single broad EPR line at g 2.0028 for the formal "C u(0)" complex Cu(dpp)2 = CuI(dpp_-)(dpp), dpp = 2,9-diphenyl-l,10-phenanthroline. While the EPR signal of Cu(dpp)2 loses intensity on cooling, possibly due to dimerization and spin-pairing, the distorted tetrahedral configuration with essential orthogonal arrangement of dpp jz systems seem s to disfavour an intramolecular electron hopping.
	Reference	(Z. Naturforsch. 50b, 115—122 [1995]; received July 25 1994)
	Published	1995
	Keywords	Crystal Structure, Copper Complexes, Sulfur Ligands, 1, 10-Phenanthrolines, EPR Spectra
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0115.pdf
	Identifier	ZNB-1995-50b-0115
	Volume	50

71	Author	Peter Dierkes, Gerlinde Frenzen, Sigrid Wocadlo, W. Erner Massa, Stefan Berger, Jürgen Pebler, Kurt Dehnicke	Requires cookie*
	Title	Komplexe des Typs [MCl4(SEt2)2] mit M = Mo und W. Kristallstrukturen, NMR-Spektren und magnetisches Verhalten [MCl4(SE t2)2] Complexes with M = Mo and W. Crystal Structures, NMR Spectra, and Magnetic Behaviour
	Abstract	The crystal structures of the thioether complexes [MCl4(SEt2)2] with M = Mo and W have been solved by X-ray methods. Both compounds crystallize isotypically in the triclinic space group P I with two formula units per cell unit. The metal atoms are octahedrally coordinated by four chlorine atoms and by the two sulfur atoms of the thioether molecules in trans position (symmetry Q) with bond lengths (average): M o -C l 233.1, M o -S 253.4, W -C l 233.1, and W -S 251.7 pm. Both complexes were also characterized by !H and 13C NM R spectro scopy as well as by measurement of the magnetic susceptibilities in the tem perature range from 1.8 to 350 K.
	Reference	Z. Naturforsch. 50b, 159—167 (1995); eingegangen am 23. August 1994
	Published	1995
	Keywords	D iethylthioethers of Molybdenum and Tungsten, Crystal Structure, NMR Spectra, Magnetic Susceptibility
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	Identifier	ZNB-1995-50b-0159
	Volume	50

72	Author	Hans Bock, Sabine Nick, Christian Näther, Wolfgang Bensch	Requires cookie*
	Title	Wechselwirkungen in Kristallen, 63 [1, 2]
	Abstract	Kristallisation und Strukturbestimmung von 1,2-Dimesitoylbenzol und von Bis(hydrogen-l,2-dimesitoylbenzol)-dinatrium-bis(ethylendiamin) Interactions in Crystals, 63 [1, 2] Crystallization and Structure Determ ination of 1,2-Dimesitoylbenzene and of Bis(hydrogen-l,2-dimesitoylbenzene)-disodium-bis(ethylendiamine)
	Reference	Z. Naturforsch. 50b, 605 (1995); eingegangen am 18. August 1994
	Published	1995
	Keywords	1, 2-Dimesitoylbenzene, Radical A nion Sodium Salt, Single Crystal Structures, M N D O Calculations
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	Identifier	ZNB-1995-50b-0605
	Volume	50

73	Author	Konstantina Kehagia, Alexander Dömling, Ivar Ugi, Wolfgang Hiller, Jürgen Riede	Requires cookie*
	Title	N e w Synthesis and Structure Determination o f 13-Aza-4,-trioxatricyclo[7,3>l?05'13]tridecane
	Abstract	A new 13-Aza-4,4,8,8,12,12-hexamethyl-2,6,10-trioxatricyclo[7,3,l,05'13]tridecane synthesis and the crystal structure are reported. It crystallizes in the monoclinic space group P2Jn with a = 1201.9(1) pm, b = 1436.6(1) pm, c = 1726.2(2) pm, ß = 90.74(1)° and Z = 8.
	Reference	Z. Naturforsch. 50b, 667—670 (1995); received August 2 1994
	Published	1995
	Keywords	Asinger Condensation, C3-Symmetric Heterocycle, 5, 6-Dihydro-2//-l, 3-oxazine, Crystal Structure
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0667.pdf
	Identifier	ZNB-1995-50b-0667
	Volume	50

74	Author	Z. Naturforsch	Requires cookie*
	Title	Organosubstituierte
	Abstract	l,6,2,5-Azoniathiasilaboratabicyc!o[3.3.0]oct-3-ene -Herstellung und Kristallstruktur [1] O rg anosubstituted 1,6,2,5-A zoniathiasilaboratabicyclo[3.3.0]oct-3-enes -P rep aratio n and Crystal Structure [1] R oland K östera *, G ü n te r Seidel3, B ernd W rackm eyerb, R oland B oesec The heterocycles MeNSi(Me2)C(R3)=C (Et)B Et [R3 = Me: A; R3 = C(M e)=CH 2: B] react with 2-aminoethanet'nioi (i) by elimination of M eNH 2 to give the monocyclic H N CH 2CH2SSi(Me2)C (R)=C (Et)B Et [R = Me: 3a; R = C(M e)=CH 2: 3b] and the ther-mically more stable bicyclic compounds H NSi(Me2)C (R)=C (E t)B (E t)SC H 2CH 2 [R = Me: 4a; R = C(M e)=CH2: 4b], 4a crystallizes in the monoclinic space ^ ro u p P2i/c [lattice con stants (at 120 K) a = 9.3239(10), b = 8.9225(11), c = 17.3958(23) A; ß = 92.207(9)°] with a folded bicyclic ring system. c/s-ClB(Et)C=C(M e)Si(M e2)Cl (C) and Na2-lB E t3 (prepared from 1 and N aH BEt3) form by elimination of M eNH2 preferentially 3 a and minor amounts of 4a. A reacts with o-aminothiophenol (2) via H NSi(Me2)C(M e)=C (Et)B (Et)S(oC 6H 4) (5) to NSi(Me2)C(M e)=C(Et)BS(oC6H 4) (6) and the products 7-10.
	Reference	Z. Naturforsch. 50b, 959—968 (1995); eingegangen am 24. November 1994
	Published	1995
	Keywords	2, 5-Dihydro-l, 2, 5-azasilaboroles, Am inothioalkanes(arenes), Bicyclic Heterocycles, Crystal Structure
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-0959.pdf
	Identifier	ZNB-1995-50b-0959
	Volume	50

75	Author	Hans-Christian Böttcher3-, Helmut Hartungb, Andre Krugb	Requires cookie*
	Title	Synthese und Kristallstruktur des koordinativ ungesättigten Komplexes [FeRu(CO)5(//-P B u92] Synthesis and Crystal Structure of the Coordinatively Unsaturated Complex [FeR u(C O )5Cu-PBu92]
	Abstract	[{Ru(CO)3C12}2] reacts with the in situ prepared reagent Li2[Fe(CO)3(PBu2)2] to give the new heterobinuclear complex [FeRu(CO)5(w-PBu92] (!) • Crystals of 1 are isomorphous to those of the known compound [Fe2(CO)5(a-PBu2)2] (2) and crystallize in the triclinic space group P 1 with a = 867,5(1), b = 1181,0(2), c = 1373,1(2) pm; a = 76,64(1), ß = 79,72(1) and y = 76,48(1)°. A double bond between the two metal atoms concluded for 2 from the results of EHMO calcula tions is also proposed for 1 (Fe=Ru: 259,8(1) pm).
	Reference	Z. Naturforsch. 50b, 1175—1180 (1995); eingegangen am 19. Januar 1995
	Published	1995
	Keywords	Iron-Ruthenium Complex, H eterobinuclear Carbonyl Complex, Iron-Ruthenium Double Bond, Crystal Structure, Molecular Structure
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	Identifier	ZNB-1995-50b-1175
	Volume	50

76	Author	Bert Werner, Bernhard Neumüller	Requires cookie*
	Title	[(TM ED A)2Li4Cl4(H20)2]*2 TMEDA: stabförmige vierkernige Li-Komplexe verknüpft durch TMEDA [(TM EDA)2Li4Cl4(H20)2]-2 TMEDA: Stick-Like Tetranuclear Li Complexes Connected by TM EDA
	Abstract	The title compound 1 was synthesized by the reaction of LiCl with T M ED A (N ,N,N ',N '-tetramethylethylendiamine) and water at 120 °C in boiling TM EDA. 1 was crystallized at -3 0 °C as colorless crystals and characterized by NM R and IR spectroscopy as well as by an X-ray structure determination. 1 is a polymer in the solid state, built up by an alternating arrangement of stick-like tetranuclear Li complexes and two T M ED A molecules. The com plexes and the T M ED A molecules are connected by hydrogen bridges in infinite chains.
	Reference	Z. Naturforsch. 50b, 1348—1352 (1995); eingegangen am 27. Februar 1995
	Published	1995
	Keywords	Lithium Complex, T M ED A Adduct, Adduct of H 20, Crystal Structure
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-1348.pdf
	Identifier	ZNB-1995-50b-1348
	Volume	50

77	Author	Béla Baján, H.-Jürgen Meyer	Requires cookie*
	Title	Neue Niob-und Tantalchloride der
	Abstract	Zusammensetzung A4[M6C118] (A = (Ga,) In, TI; M = Nb, Ta) New Niobium and Tantalum Chlorides of the Composition A4[M6C118] (A = (Ga,) In, TI; M = Nb, Ta) The syntheses of new compounds of the general formula A4[Nb6Cli8] (A = Ga, In, Tl) and A4[TaöCli8] (A = In, Tl) are reported. The indexing of their X-ray powder patterns was performed isotypically with K^NböClis]-A single-crystal structure refinement on In4[Ta6Clis] gave the space group C2/m, Z -2, a = 1077.7(3) pm, b = 1542.3(5) pm, c = 960.2(2) pm, ß = 117.68(2) . The structure contains [TaöCliiClö] strongly distorted coordination sphere of Cl -.
	Reference	Z. Naturforsch. 50b, 1373—1376 (1995); eingegangen am 16. Januar 1995
	Published	1995
	Keywords	Niobium and Tantalum Chloride Clusters, Monovalent Ga, In, TI, Synthesis, Crystal Structure
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	TEI-XML for	default:Reihe_B/50/ZNB-1995-50b-1373.pdf
	Identifier	ZNB-1995-50b-1373
	Volume	50

78	Author	W. S. Sheldrick, B. Schaaf	Requires cookie*
	Title	Ditelluridogermanaten(IV) der Alkalimetalle K -C s M ethanolotherm al Synthesis and Crystal Structure of Diselenido-and Ditelluridogerm anates(IV ) of the Alkali Metals K -C s
	Abstract	Methanolothermal reaction of M2C 0 3 (M = K, Rb) with Ge and Se yields respectively the diselenidogerm anates(IV) K2G eS e4 and Rb2G eSe4, both of which contain chain anions ro[GeSe42_] in which G eS e4 tetrahedra are linked via S e -S e bonds. A similar structural principle is found in the ditelluridogermanates(IV) Rb2GeTe4 and Cs2GeTe4, prepared by reaction of M2C 0 3 (M = Rb, Cs) with Ge and Te in methanol at temperatures o f respectively 200 and 160 °C. The effect of cation size on the chain conformation is discussed. Rb4G e4S eU)CH3O H , which is formed together with Rb2G eSe4, exhibits isolated anions [G e4S e 10]4_ with an adamantane-like structure. Methanolothermale Synthese und Kristallstruktur von Diselenido-und
	Reference	Z. Naturforsch. 50b, 1469—1475 (1995); eingegangen am 31. März 1995
	Published	1995
	Keywords	Selenidogerm anates(IV ), Telluridogermanates(IV), Alkali Cations, Methanolothermal Synthesis, Crystal Structure
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	Identifier	ZNB-1995-50b-1469
	Volume	50

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