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1	Author	H. N. Öth, J. K. Nizek	Requires cookie*
	Title	Reduktion eines Bis(chlorphenylphosphanyl)methylids zum entsprechenden Diphosphan und Tetraphosphinan
	Abstract	R e d u ctio n o f a B is(c h lo ro p h en y lp h o sp h an y l)m e th y lid e to the C o rresp o n d in g D ip h o sp h a n e and T etraphosp h in an e F. B reitsam eter, A. S ch m id p e te r* , The bis(phosphanyl)ylides Ph3PC(PPh2)2, Ph3PC(PPhCl)2 (3) and Ph3PC(PCl2)2 have ana logous molecular structures. Details reflect the different charge transfer from the ylide center to the phosphanyl substituents. Chlorination destroys the chirality of 3. Reduction leads to the diphosphane 8 and the 1,2,4,5-tetraphosphinane 9 which are also included in the structural comparison.
	Reference	(Z. Naturforsch. 54b, 1—7 [1999]; eingegangen am 31. August 1998)
	Published	1999
	Keywords	Phosphonium Ylides, Negative Hyperconjugation, Phosphorus Carbon Heterocycles, Diphos-phirane, Tetraphosphinane
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0001.pdf
	Identifier	ZNB-1999-54b-0001
	Volume	54

2	Author	Z. Naturforsch	Requires cookie*
	Title	Pentacoordinated Nitrogen Atoms in the Structure of Hexalithium Bis[methylsilyl-tris(methylimide)] Hexakis(tetrahydrofuran)
	Abstract	Lithiation of tris(methylamino)wt'f/7v/silane using an excess of n -butyllithium affords the cor responding trifunctional lithium amide in high yield. The compound crystallizes from tetrahy-drofuran as a dimer with six donor molecules: {[M eSi(NM eLi)3]2(thf)6}. The cluster is a cage structure grouped around a crystallographic center of inversion. The silicon and lithium atoms are tetrahedrally tetracoordinated, but the nitrogen atoms are pentacoordinated and have a square pyramidal environment of one carbon, one silicon, and three lithium atoms. Parallels can be drawn to other species with polymetallated nitrogen functions. An analogous compound was prepared from tris(methylamino)vwv/silane.
	Reference	(Z. Naturforsch. 54b, 8—12 [1999]; received September 1 1998)
	Published	1999
	Keywords	Silylamines, Silylamides, Crystal Structure
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0008.pdf
	Identifier	ZNB-1999-54b-0008
	Volume	54

3	Author		Requires cookie*
	Title	Synthesis and Molecular Structures of 2-Trimethylsilyl-, 2-Trimethylgermyl-, and 2-Trimethylstannyl-pyridines
	Reference	(Z. Naturforsch. 54b, 13 [1999])
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0013.pdf
	Identifier	ZNB-1999-54b-0013
	Volume	54

4	Author	Z. Naturforsch	Requires cookie*
	Title	The Stereochemistry of Chloro-bis(N-morpholino)phenylsilane
	Abstract	Treatment of phenyltrichlorosilane with an excess of morpholine and N-lithium-morpholide in pentane/toluene affords only the disubstitution product Cl(Ph)Si(M or)2 with Mor = 0 (C H 2C H :)2N-. The third halogen atom is not replaced owing to sterical hindrance. The title compound crystallizes with two independent molecules in the unit cell. These two molecules can be classified as enantiomers, because a disrotatory twist of the two morpholino ligands away from the potential mirror plane induces a chiral conformation. In benzene solution there is racemization owing to completely free rotation, chair/boat interconversion, and nitrogen inversion of the morpholino groups on the NMR time scale, but all CH 2 protons remain anisochronous (diastereotopic).
	Reference	(Z. Naturforsch. 54b, 18—20 [1999]; received October 15 1998)
	Published	1999
	Keywords	Silylamines, Aminosilanes, Symmetry, NMR Data, Crystal Structure
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0018.pdf
	Identifier	ZNB-1999-54b-0018
	Volume	54

5	Author	Z. Naturforsch	Requires cookie*
	Title	Indium Triiodide Complexes of Bis(diphenyIphosphino)ethane (dppe) and its Disulfide (dppeS2)
	Abstract	Bis(diphenylphosphino)ethane (dppe) and its disulfide (dppeS2) react with two equivalents of indium triiodide to give high yields of the corresponding 1:2 adducts. According to crys tal structure determinations, both compounds are molecular bis-terminal complexes with the ligands in an all-trans conformation. Contrary to previous findings for complexes of the indium trihalides and of G aB r3 and G al3 with ditertiary phosphines in fixed cis-structure [bis(diphenylphosphino)ethene or -benzene], no iodide redistribution is observed to give the ionic species [(dppe)Inl2]+ [InL ]-. The molecular structures are also retained in solution.
	Reference	(Z. Naturforsch. 54b, 21—25 [1999]; received October 10 1998)
	Published	1999
	Keywords	Indium Triiodide, Phosphine Complexes, Phosphine Sulfide Complexes, Conformation, Crystal Structure
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0021.pdf
	Identifier	ZNB-1999-54b-0021
	Volume	54

6	Author	Z. Naturforsch	Requires cookie*
	Title	(Tnmethylphosphine)(triphenylsilyl)gold(I) and Related Compounds
	Abstract	M ig u el M o n g e O ro za, A n n ette S chierb, H u b ert S ch m id b au r1 ' "' Gold-Silicon Compounds, Silyl-Gold Compounds, (Phosphine)gold(I) Complexes M ononuclear coordination compounds of the type (R3P)AuSiR'3 with R = R' = Ph and R = Me, R' = Ph have been obtained from reactions of the corresponding halide complexes (RiPjAuCl with the silyllithium reagent LiSiPh.v The fully phenylated species undergoes ligand redistribution in solution to give homoleptic ionic species. (M e.^ A u S iP h i is less susceptible to this process and crystallizes from solutions as the heteroleptic complex. The crystal structure of this compound has been determined by X-ray diffraction. In the crystal lattice the molecules are not associated.
	Reference	(Z. Naturforsch. 54b, 26—29 [1999]; received October 27 1998)
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0026.pdf
	Identifier	ZNB-1999-54b-0026
	Volume	54

7	Author	Z. Naturforsch	Requires cookie*
	Title	Diphenyl(2-hydroxy-phenyl)phosphine and its Trimethylsilyl Ether as Ligands for Gold(I) Complexes
	Abstract	Gold(I) Complexes, Phosphine Ligands, Diphenyl(2-hydroxy-phenyl)phosphine, Hydrogen Bonding, Trimethylsilyl Ether Diphenyl(2-hydroxy-phenyl)phosphine was introduced as a ligand for gold(I) halides and pentafluorophenyl gold(I) in order to probe the interplay of intra-and intermolecular interactions based on aurophilic (Au- • -Au) and hydrogen bonding. 1:1 complexes of the type Ph:(2-HO-CftH^P-Au-X with X = Cl, Br, C6F5 have been prepared and characterized by analytical and spectroscopic data. The crystal structure of the chloro complex (1) has been determined. In the lattice the molecules form dimers through O-H • Cl hydrogen bonds. Au- • Au contacts are ruled out by steric congestion. Reaction of 1 with triethylamine yields a 1:1 adduct with O-H • -NEt, hydrogen bonding. The trimethylsilyl ether of the title ligand also forms 1:1 complexes with AuCl, AuBr, Aul, and AuC6F5. The crystal structures of the chloro (5) and iodo (7) compound have been determined. In both cases the lattices are built from monomers which show only minor differences in their conformations. The silylether groups are not acting as intra-or intermolecular donor functions to the gold atoms.
	Reference	(Z. Naturforsch. 54b, 30—37 [1999])
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0030.pdf
	Identifier	ZNB-1999-54b-0030
	Volume	54

8	Author	Z. Naturforsch	Requires cookie*
	Title	SrRhIn2, SrPdIn2, Srlrln2, and SrPtIn2 -New Intermetallic Compounds with a Filled Variant of the Caln2 Structure
	Abstract	SrR hlm , SrPdIn2, Srlrln2, and SrPtIn2 have been synthesized by reaction of mixtures of the elements in glassy carbon crucibles in a high-frequency furnace. The new compounds were investigated by X-ray diffraction on powders as well as single crystals; a = 437.3(2), b = 1091.9(5), c = 798.0(2) pm for SrRhln^, a = 453.54(7), b = 1079.8(2), c = 790.4(1) pm for SrPdIn2, a = 434.83(8),b= 1102.6(2) ,c = 798.6(2) pm for Srlrln2, a = 447.5(1) , b = 1091.0(3), c = 787.6(1) pm for SrPtIn2. They adopt the MgCuAl2 structure, a ternary ordered version of Re^B. Chemical bonding analysis leads to the description of a filled S rln2 structure in which the In-in-bonding is modified by the insertion of transition metal atoms into the planar strontium layers, thus favoring strong indium-transition metal
	Reference	(Z. Naturforsch. 54b, 38—44 [1999]; received August 28 1998)
	Published	1999
	Keywords	Intermetallic Compounds, Crystal Structure, Chemical Bonding
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0038.pdf
	Identifier	ZNB-1999-54b-0038
	Volume	54

9	Author	MarkusF. Zum, R. Olf-D, Hoffm Ieter, Rainer Ann, Pöttgen	Requires cookie*
	Title	The Intermetallic Zirconium Compounds ZrNiAl, ZrRhSn, and ZrPtGa -Structural Distortions and Metal-Metal Bonding in Fe2P Related Compounds
	Abstract	ZrNiAl, ZrPtGa, and ZrRhSn have been prepared by reacting the elements in an arc-melting furnace and subsequent annealing at 970 K. These compounds have previously been investigated only by use of X-ray powder data for ZrPtGa and ZrRhSn and single crystal film data for ZrNiAl. Precise single crystal diffractometer data are reported in the present paper. The structure of ZrNiAl is confirmed. It adopts a substitution variant of the FeiP type: P62m, a = 691.5(2), c = 346.6(1) pm, Z = 3, wR2 = 0.0538, 320 F2 values, 14 parameters. The structure refinement reveals a large displacement parameter U 33 for one nickel position, indicative of a slight nickel dislocation. Weak superstructure reflections could be found on Guinier powder patterns for ZrPtGa and ZrRhSn. These compounds crystallize with the HfRhSn type structure (Z = 6 , space group P62c), a superstructure of the Fe2P type: a = 714.5(1), c = 706.3(2) pm, w/?2 = 0.0651, 594 F2 values, 18 parameters for ZrPtGa and a = 734.2(2), c = 721.8(2) pm, wR2 = 0.0349, 355 F2 values, 18 parameters for ZrRhSn. Structural motifs of these compounds are transition metal centered trigonal prisms formed by the zirconium, aluminium, gallium, and tin atoms. While these trigonal prisms are regular in ZrNiAl, significant distortions occur in the structures of ZrPtGa and ZrRhSn. Due to the distortions of the trigonal prisms in the superstructures, some platinum and rhodium atoms are dislocated from the subcell mirror planes towards Pt-Pt and Rh-Rh pairs with distances o f 310 and 313 pm, respectively. The formation of the superstructure is most likely due to packing reasons. Chemical bonding in ZrRhSn was investigated on the basis of an extended Hückel calculation.
	Reference	(Z. Naturforsch. 54b, 45—53 [1999]; received August 20 1998)
	Published	1999
	Keywords	Intermetallic Compounds, Crystal Structure, Superstructure, Chemical Bonding
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0045.pdf
	Identifier	ZNB-1999-54b-0045
	Volume	54

10	Author	S. Kolf, W. Preetz	Requires cookie*
	Title	Darstellung und Kristallstruktur von [OsFPy5][BF4] * H20 * CH2 CI2 Synthesis and Crystal Structure o f [O sFPy5][B F 4] * H20 * C H 2C12
	Abstract	Fluoro-pentakis-pyridine-osmium(II) Tetrafiuoroborate, Synthesis, Crystal Structure In the reaction of K2[OsF6] with glycerine and pyridine [OsFPy3]+ (5%) is formed as a by product which can be separated chromatographically from the main product frans-[OsF2Py4]. The X-Ray structure has been determined on a single crystal of [OsFPy5][BF4JTI2O C H 2Cl2 (orthorhombic, space group Pbca, a = 18.774(5), b = 16.833(3), c = 20.924(6) A. Z = 8). Due to theo stronger trans influence of pyridine as compared to fluorine the Os-N' bond length of 2.06 A in the F*-Os-N' axis is shorter than the Os-N distances of the OsPy4 base ranging from 2.07 to 2.10 A.
	Reference	(Z. Naturforsch. 54b, 54—56 [1999]; eingegangen am 26. August 1998)
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0054.pdf
	Identifier	ZNB-1999-54b-0054
	Volume	54

11	Author	M. Ax Herberhold, U. Do Steffl, BerndW. Rackmeyer	Requires cookie*
	Title	l,3-Distanna-2-phospha-[3]ferrocenophanes -Synthesis, Reactivity and NMR Spectroscopic Properties
	Abstract	-organo(R)-l,3-distanna-2-phospha-[3]ferrocenophanes [R = Me (2a), rBu (2b), CöH i i (2c), Ph (2d)] and one arsa-analogue 2d(As) were obtained from the reaction of l,l'-bis(chlorodim ethylstannyl)ferrocene 1 with either bis(trimethylsilyl)methylphosphane or the dilithio derivatives, Li2PR and Li^AsPh, respectively. All compounds 2 react with chalco-gens (oxygen, sulfur, selenium) by cleavage of the Sn-P bonds and formation of the known l,3-distanna-2-chalcogena-[3]ferrocenophanes. In contrast, 2d traps pentacarbonylmetal frag ments [M(CO)5] to give the stable phosphane complexes [M = Cr (4d), Mo (5d), W (6d)]. The l,l'-bis(diorganophosphanostannyl)ferrocenes [R = fBu (3b), Ph (3d)] were prepared for comparison of NMR data. The ferrocenophanes 2 are fluxional with respect to fast movement of the cyclopentadienyl rings which induces inversion at the pyramidal phosphorus atom. This dynamic process is slow in the cases of 2d(As) and of the pentacarbonyl complexes 4d -6d. All new compounds were characterised by 'H , i3C, 31P and 1 l9Sn NMR spectroscopy. Various 2D heteronuclear shift correlations {e.g. 11P /1H and ll9Sn/'H) were carried out for the com pounds 2 and also for non-cyclic derivatives such as bis(trimethylstannyl)phenvlphosphane and -arsane in order to determine absolute signs of coupling constants [e.g. 7(n S n,''P) > 0 and 2J(] l9Sn,' l7Sn) < 0]. The NM R data suggest that the molecular frameworks of the ferroceno phanes 2 are not particularly strained.
	Reference	(Z. Naturforsch. 54b, 57—62 [1999]; received July 28 1998)
	Published	1999
	Keywords	Ferrocene, Tin, Phosphorus, NMR Data, Coupling Signs l, l, 3, 3-Tetramethyl-2
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0057.pdf
	Identifier	ZNB-1999-54b-0057
	Volume	54

12	Author	Max Herberhold, Kurt Bauer, W. Olfgang, M. Ilius	Requires cookie*
	Title	Oligonuclear Tricarbonylchromium-and Tricarbonyltungsten Derivatives of Tris(l-cyclohepta-2,4,6-trienyl)phosphane, P(C7H7)3 , and Related Ligands
	Abstract	A series of trinuclear carbonylmetal complexes of tri(l-cyclohepta-2,4,6-trienyl)phosphane, P(C? 1^ 7)3 (1), has been prepared by the reaction of P(SiM e3)3 with ^-tro p y liu m halfsand wich salts, [(7/7-C7H7)M (CO)3]BF4, (M = Cr, Mo, W). While phosphorus remains uncoor dinated in the chromium complex P[(?/6-C7Hv)Cr(CO)3]3 (2a), the molybdenum and tung sten analogues, P[(//4-C7H 7)M (CO)3][(??6-C7H7)M(CO)3]2 (M = Mo (2b), W (2c)), contain a coordinated phosphorus atom together with a //4-norcaradienyl substituent. Reaction of 2a with pentacarbonylmetal fragments, [M(CO)s], leads to trinuclear products, P[(/;2-C7H7)M-(CO)4][(> 7/6-C7H7)M(CO)3]2 (M = Cr (5a), W (5c)), in which phosphorus is coordinated next to an //'-cycloheptatrienyl substituent. Several alkyl-and arylphosphanes containing [(^6-C7H7)Cr(CO)3] substituents (X), e. g. Ph2P(X) (6a), RP(X)2 (R = Me (7a), CH2Ph (8a), Ph (9a)) and (X)2P(R')P(X)2 (R' = methylene (10a) or o-phenylene (11a)), have also been synthesized. The chromium complexes 6a -11a contain an uncoordinated phosphorus center, but in contrast to 9a, the corresponding tungsten compound PhP[(?;4-C7H7)W (CO)3][(?/6-C7H7)W(CO)3]2 (9c) has again a structure similar to 2c. The arsenic complexes, As[(?/6-C7H7)M(CO)3]3 (M = Cr (12a), W (12c)) both contain an uncoordinated arsenic center, analogous to 2a. The molecular structures of all new complexes in solution at room temperature were deduced from a consistent set of 'H, l,C and 31P NM R data, and X-ray structure determinations were carried out for 2a and 5c.
	Reference	(Z. Naturforsch. 54b, 63—72 [1999]; received August 3 1998)
	Published	1999
	Keywords	Halfsandwich Compounds, Cycloheptatrienyl Complexes, Chromium, Tungsten, X-Ray Data
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0063.pdf
	Identifier	ZNB-1999-54b-0063
	Volume	54

13	Author	U. D. Rutkow Ski, P. Strauch	Requires cookie*
	Title	Oxidative S-S-Kopplung von 1,2-Dithiooxalat durch intramolekulare Redoxreaktion der Selen(II)-und Tellur(II)-Komplexe O xidative S-S C oupling o f 1,2-D ithiooxalate by Intramolecular R edox Reaction o f the Selenium (II) and Tellurium (II) C om plexes
	Abstract	The reaction of sodium monochalcogenopentathionates, Na2[Y(S20 3)2] (Y = Se, Te) with potassiumdithiooxalate in a water/methanol solution in presence of large cations (e. g. Ph4P+, Ph4As+ or BzlPh3P+) yields complexes of the type [Y(dto)2]2~ (Y = Se, Te). These complexes are of limited stability and undergo a redox reaction in solution. As the main product of this redox process the 3,4-dithiahexane-2,5-dione-l,6-di(thiocarboxylate) was isolated and characterized by X-ray structure analysis as the benzyltriphenylphosphonium salt (monoclinic space group P2^/c, Z = 2, a = 8.899(5) A, b = 16.458(2) Ä, c = 16.034(6) A and ß = 98.02(2)°). With Te_+ (Y = Te) as the coordination center we have been able to isolate the intermediate complex (Ph4P)2[Te(dto)2],
	Reference	(Z. Naturforsch. 54b, 73—76 [1999]; eingegangen am 13. August 1998)
	Published	1999
	Keywords	1, 2-Dithiooxalate, X-Ray Data, Disulfide
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0073.pdf
	Identifier	ZNB-1999-54b-0073
	Volume	54

14	Author	Jutta Grebe, Gertraud Geiseler, Klaus Harms, KurtD. Ehnicke	Requires cookie*
	Title	Donor-Akzeptor-Komplexe von Halogenidionen mit 1.4-Diiodtetrafluorbenzol Donor-A cceptor C om p lexes o f H alide Ions w ith 1,4-D iiodotetrafluorobenzene
	Abstract	1.4-Diiodotetrafluorobenzene, Donor-Acceptor Complexes, Crystal Structure (Ph4P)X as well as (Me4N)X (X = Cl, Br, I) react with 1,4-diiodotetraflu-orobenzene in CH 2C12 and CH 3CN solutions, respectively, to give the donor-acceptor complexes (Ph4P M (C 6F4I2)C b]-4 C H iC l2 (1), (Ph4P)2[(C6F4L)Br?]-2 CH?CL (2), (Me4N)[(C6F4I2)Cl] (3), (Me4N)[(C6F4I2)Br]-CH3CN (4), (Ph4P)2[(C6F4I2)3Br2]-4C H 2Cl2 (5), (Ph4P)2[(C6F4I2)3I2] (6) and (Me4N)2[(C6F4I2)3I2] (7). All complexes have been characterized by single X-ray crystallographic structure determinations. 1: Space group P i, Z = 1, lattice dimensions at 203 K: a = 1090.2(1), b = 1206.2(1), c = 1242.8(1) pm, a = 91,84(1)°, ß = 106.60(1)°, 7 = 99.84(1)°. 2: Space group P I, Z = 1, lattice dimensions at 233 K: a = 1129.7(2), b = 1183.9(1), c = 1293.4(1) pm, q = 65.52(1)°, ß = 65.74(1)°, 7 = 89.02(1)°. 3: Space group P 2{/n, Z = 4, lattice dimensions at 243 K : a = 714.8(1), b = 2405.7(3), c = 930.8(1) pm, ß = 96.38(1)°. 4: Space group P2,/c, Z = 4, lattice dimensions at 203 K: a = 1400.8(1), b = 1669.9(2), c = 795.9(1) pm, ß= 102.81(1)°.
	Reference	(Z. Naturforsch. 54b, 77—86 [1999]; eingegangen am 2. September 1998)
	Published	1999
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	Identifier	ZNB-1999-54b-0077
	Volume	54

15	Author	HansGünter Aurich, M. Ichael Soeberdt	Requires cookie*
	Title	Darstellung enantiomerenreiner 3-C)xa-2,7-diazabicyclo[3.3.0]octane und ihre Umwandlung in andere bicyclische Ringsysteme Preparation o f Pure Enantiom eric 3-O xa-2,7-d iazab icyclo[3.3.0]octan es and their Conversion to Other B icy clic R ing-System s
	Reference	(Z. Naturforsch. 54b, 87—95 [1999]; eingegangen am 25. August 1998)
	Published	1999
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	Identifier	ZNB-1999-54b-0087
	Volume	54

16	Author	D. Aniela Koch, Karlheinz Siinkel, W. Olfgang, Beck	Requires cookie*
	Title	Metallkomplexe mit biologisch wichtigen Liganden, CXI [1]. Phosphan-Gold(I), -Nickel(II) und -Platin(II) Komplexe mit dem Anion von Hydantoin und 3,4-Pyridindicarbonsäureimid
	Abstract	M etal C om p lexes o f B io lo g ica lly Important Ligands, CXI [1]. Phosphine G old(I), N ickel(II) and Platinum(II) C om plexes with the A nion o f H ydantoin and o f 3,4 Pyridine D icarboxylic Imide Hydantoin, Imide of 3,4-Pyridindicarboxylic Acid, Gold, Platinum The anions of hydantoin (L 1) and of the imide of 3,4-pyridine dicarboxylic acid (L2) form the complexes Ph3PA u(L'-H +) (1), Ph3PAu(L2-H+) (2), (nBu3P)2N i(L '-H +)2 (3) and the ligand bridged compounds Ph3PAu(L2-H+)M(PEt3)Cl2 (M = Pd, Pt, 4, 5). With the neutral ligand L2 the complexes Cp*Ir(Cl)2(L2) (6), (/?-cymene)Ru(Cl)2 (L-) (7) and (Et3P)(Cl)2Pd(L2) (8) were obtained. Complexes 1, 2 and 6 were characterized by X-ray diffraction.
	Reference	(Z. Naturforsch. 54b, 96—102 [1999]; eingegangen am 13. August 1998)
	Published	1999
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	Identifier	ZNB-1999-54b-0096
	Volume	54

17	Author	Di, Stephanie Janeda, Dietrich Mootz	Requires cookie*
	Title	Di-bis Pentahydrate von fünf Alkylendiaminen. Eine Fallstudie zu ein-und zweidimensionalen Wasserpolymeren in Festkörpern [1]-to Pentahydrates of Five Alkylenediamines. A Case Study of One-and Two-Dimensional Water Polymers in Solids [1]
	Abstract	The crystal structures of five low-melting hydrates of »-alkane-a,u;-diamines, H2N(CH2)"NH2 • x H20 , for short C" ■ x W, have been determined. As a common feature, the water molecules are mutually linked by hydrogen bonds O-H -O to form low-dimensional polymers. These are a meandering chain in C2 • 2 W (space group I 2la, Z -4 formula units per unit cell), a zig zag chain in C6 • 2 W (P 2,/c, Z = 2), a ribbon of consecutively condensed five-membered rings in C3 • 3 W (P 2,/c, Z = 4) and a layer of condensed and spiro-linked rings of varying size each in C7 • 3 W (P i, Z = 4) and C4 • 5 W (C 21c, Z = 4). Further hydrogen bonding, between the water polymers and the bifunctional amine molecules, leads to overall connectivities which are three-dimensional in each structure.
	Reference	(Z. Naturforsch. 54b, 103—108 [1999]; eingegangen am 7. September 1998)
	Published	1999
	Keywords	Amine Hydrates, Hydrates, Melting Diagram, Water Polymers, Hydrogen Bonding
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	Identifier	ZNB-1999-54b-0103
	Volume	54

18	Author	G. C. Papavassilioua ', G. A. Mousdis3, A. Terzisb, C. P. Raptopoulouh	Requires cookie*
	Title	Similar Compounds
	Abstract	The title compounds (natural low-dimensional semiconductor systems) exhibit strong exci tonic optical absorption bands in the UV spectral region, because of the quantum confinement of excitons, as in the cases of bivalent-metal and trivalent-metal halide complexes. The excitonic bands are shifted to longer wavelengths, approaching those of the corresponding bulk materials, as the anion-size or the anion-dimensionality increases.
	Reference	(Z. Naturforsch. 54b, 109—112 [1999]; received July 3 1998)
	Published	1999
	Keywords	Main Group Metal-Halide Complexes, Electronic Spectra, Excitons
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0109.pdf
	Identifier	ZNB-1999-54b-0109
	Volume	54

19	Author	J. Nolte, P. Neubauer, H. Vogt, M. M. Eisel	Requires cookie*
	Title	Synthesen und Kristallstrukturen
	Abstract	von Tris(di-w-propylamino)-/?-brombenzylphosphonium-bromiden: [(C3H7)2N]3PCH2C6H4Br+Br und [(C3H7)2N]3PCH2C6H4Br+Br3 Syntheses and Crystal Structures o f Tris(di-/2-propylam ino)-/?-brom obenzyl-phosphonium Brom ides: [(C3H7)2N ]3PC H 2C6H4Br+Br~ and [(C3H 7)2N ]3PC H 2C 6H4Br+Br3- Tris(di-/?-propylamino)-/?-bromobenzylphosphonium Bromides, Synthesis, Crystal Structure, Tris(di-/7-propylamino)phosphine
	Reference	(Z. Naturforsch. 54b, 113—116 [1999]; eingegangen am 17. August 1998)
	Published	1999
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	TEI-XML for	default:Reihe_B/54/ZNB-1999-54b-0113.pdf
	Identifier	ZNB-1999-54b-0113
	Volume	54

20	Author	H. 20, Wilmar Meske, Dietrich Babel	Requires cookie*
	Title	Kristallstrukturen
	Abstract	von Octacyanomolybdaten(IV) [1]. V. Quadratisch-antiprismatische [Mo(CN)8]-Koordination in den cyanoverbrückten Kupfer-und Cadmium-Amminkomplexen Cu2(NH3)8[Mo(CN)8] und Cd2(NH3)6[Mo(CN)8] H20 Crystal Structures of Octacyanomolybdates(IV) [1]. V. Square Antiprismatic [Mo(CN)8]-Coordination of the Cyano-Bridged Copper and Cadmium Ammine Complexes Cu->(NH3)8[Mo(CN)8] and Cd2(NH3)6[Mo(CN)8] Crystal Structure, Octacyanomolybdate(IV), Cyano Bridged Ammine Cations, Copper(II), Cadmium At single crystals of the cyano complexes Cu2(NH3)8[Mo(CN)8] (a = 934.1(4), b = 1595.9(3), c = 1391.9(4) pm, ß = 90.57(2)°, monoclinic space group Cc, Z = 4) and Cd2(NH3)6[Mo(CN)8]-H20 (a = 1708.7(12), b = 1307.8(4), c = 942.9(3) pm, orthorhombic space group Pna2,, Z = 4) X-ray structure determinations were performed at temperatures of about 175 K. Both compounds, prepared at about 275 K in aqueous ammonia solutions and easily decomposing, exhibit distorted square antiprismatic [Mo(CN)8]4~ coordination of clo sely resembling dimensions (mean distances Mo-C: 215.7 and 215.3 pm, resp.). The anions are bridged by ammine cations to form chains in the copper and a three-dimensional framework in the cadmium compound. Some of the cyano bridges are strongly bent (C-N-M1 1 as small as 124° and 130°, resp.). The distorted M coordination is square pyramidal and elongated octahedral in the case of the two copper atoms (Cu-N ranging from 197 to 257 pm, three and five ligands, respectively, being NH3). In the case of cadmium both metal atoms are octahedrally coordinated, one exhibiting mer-, the other fac-arrangement of three NH3 and three NC-ligands (Cd-N ranging from 229 to 247 pm, mean 235 pm for either cadmium atom). The findings are compared with related compounds and further details are discussed.
	Reference	(Z. Naturforsch. 54b, 117—122 [1999]; eingegangen am 6. August 1998)
	Published	1999
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	Identifier	ZNB-1999-54b-0117
	Volume	54

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