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2000 (185)
21Author    Henri Brunner, M. Arkus, N. Iem Etz, M. Anfred ZabelRequires cookie*
 Title    Optisch aktive Ubergangsmetall-Komplexe, 122 [1]. Synthese von Palladium(II)-Schiff-Base-Komplexen -intramolekulare Wechselwirkungen O ptically Active Transition M etal C om plexes, 122 [1], Synthesis of Palladium (II) Com plexes w ith Schiff B ase Ligands -Intram olecular Interactions  
 Abstract    Imines of salicylaldehyde and 2,6-diformyl-p-cresol have been used as ligands in palla­ d iu m ^) complexes. Enantiomerically pure ligands give enantiomerically pure complexes, racemic ligands give racemates and meso-forms. Differences between the respective isomers of the ligands within the complexes and between the diastereomers of the complexes were investigated. Crystal structure analyses established the trans configuration at the metal center. 
  Reference    Z. Naturforsch. 55b, 145—154 (2000); eingegangen am 25. Oktober 1999 
  Published    2000 
  Keywords    Schiff Bases, Palladium(II) Complexes, Diastereomers, Crystal Structure 
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 Identifier    ZNB-2000-55b-0145 
 Volume    55 
22Author    Z. NaturforschRequires cookie*
 Title    Intermetallic Cerium Compounds with Ordered U3Si2 Type Structure  
 Abstract    New intermetallic cerium compounds Ce2 7iMg (T = Ni, Cu, Pd), CqiTjCd (T -Pd, Pt, Au), and CtiTzPb (T = Pt, Au) were prepared by reaction of the elements in sealed tantalum tubes in a high-frequency furnace. Most C e : ^ ^ (X = Mg, Cd, Pb) compounds are stable after annealing at about 1000 K, while Ce:Pd2Mg is obtained as single phase only after melting and quenching. A thermal treatment at about 1000 K leads to decomposition in CePdMg and CePd. The eight compounds were investigated by X-ray diffraction both as powders and single crystals, and most structures were refined from single crystal data. They adopt an ordered l^Si? type structure with space group PA/mbm: a = 759.6(1), c = 376.71 (9) pm, wR2 = 0.0562, 294 F values, 12 parameters for Ce2Ni2Mg, a = 787.41(9), c = 387.23(7) pm, wR2 = 0.0438, 222 F2 values, 12 parameters for Ce2Cu2Mg, a = 777.14(8), c = 400.03(7) pm, wR2 = 0.0276, 221 F2 values, 13 parameters for Ce2Pd2.03Mg0.97, a = 777.90(6), c = 393.28(6) pm, wR2 = 0.0360,317 F2 values, 12 parameters for Ce2Pd2Cd, and a = 779.90(7), c = 389.97(7) pm, wR2 = 0.0453, 315 F2 values, 12 parameters for Ce2Pt2Cd. Refinement of the occupancy parameters revealed full occupancy for most sites. A mixed palladium/magnesium (97 % Mg / 3 % Pd) occupancy was observed only for the 2a site of Ce2Pd2.03Mg0.97, indicating a small homogeneity range for this compound. Ce2Au2Cd (a = 804.93(7), c -393.36(6) pm) and the plumbides Ce2Pt2Pb {a = 794.63(7), c = 381.50(6) pm) and Ce2Au2Pb (a -810.70(7), c = 394.85(7) pm) were characterized through their Guinier powder data. The structures of the Ct2 FX compounds can be interpreted as an intergrowth of distorted AIB2 and CsCl related slabs of compositions CzTi and CeX. The course of the lattice parameters and chemical bonding within the series of C^TjX compounds are briefly discussed. 
  Reference    Z. Naturforsch. 55b, 155—161 (2000); received November 10 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0155 
 Volume    55 
23Author    ElenaL. Abisbal3, A. Ntonio Sousaa, A. Lfonso, C. Astiñeiras3, JoseA G Arcía-V, Jaim Ázquez3, R. Om Ero3, G. Ordon, A. B. Ainb, DouglasX W EstbRequires cookie*
 Title    Electrochemical Synthesis of a 6-Coordinate Cadmium(II) Complex with N-Methylisatin N(4)-cyclohexylthiosemicarbazone  
 Abstract    Cadmium, N-Methylisatin N(4)-Cyclohexylthiosemicarbazone, Electrochemical Synthesis, X-Ray Data Cadmium metal was oxidized in the presence of N-methylisatin N(4)-cyclohexyl-thiosemicarbazone (HMeIs4Chex) in an acetonitrile solution, which produced a complex of the formula [Cd(MeIs4Chex)2]. The two MeIs4Chex ligands are at an angle close to 90° from each other, and there is hydrogen bonding to two adjacent molecules by the anionic ligands remaining NH groups. The complex crystallizes in the monoclinic space group P2]/c with a = 11.820(4), b = 11.491(4), c = 27.834(4) A, ß = 106.82(2)°, V = 3618.7(17) Ä* and Z = 4. 
  Reference    Z. Naturforsch. 55b, 162—166 (2000); received October 18 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0162 
 Volume    55 
24Author    C. Bender, D. W. Ulff-M, H. Older, F. Vogt, M. M. Ritschl, EiselRequires cookie*
 Title    Synthese und Kristallstruktur des Bromdifluormethyl-triphenyl- phosphoniumbromids, [(C6H5)3 PCF2Br]+ Br" Synthesis and Crystal Structure o f B rom odifluorom ethyl-triphenylphosphonium Brom ide, [(C6H5)3PC F2Br]+ Br~  
 Abstract    Difluorobromomethyl-triphenylphosphonium bromide [(C6H5)3PCF2Br]+ Br-(1) has been prepared by the reaction of triphenylphosphine with dibromodifluoro-methane in acetonitrile or methylene chloride. The colorless crystals are monoclinic, space group P 2,/n, Z=4, a = 1067.1(2), b = 1488,5(2), c = 1178,2(2) pm, ß = 95,67(3)°. The lattice contains Br~ anions and [(C6H5)3PCF2Br]+ cations with a Br-Br distance of 322,33(11) pm.. For the title compound the results of AM 1, PM 3 ,and MNDO calculations are in good agreement with corresponding values determined by the X-ray analysis only in the case of PM 3. The yellow-red [(C6H5)3PCF2Br]+ Br3~ (2) has been obtained by treating 1 with equimolar quantities of elemental bromine in methylene chloride solution. E inleitung 
  Reference    Z. Naturforsch. 55b, 167—170 (2000); eingegangen am 28. Oktober 1999 
  Published    2000 
  Keywords    Bromodifluoromethyl-triphenylphosphonium Bromide, Synthesis, Crystal Structure 
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 Identifier    ZNB-2000-55b-0167 
 Volume    55 
25Author    AlfonsoC. Astiñeiras-C, Am, IgnacioS. De L, Cueva -Torregrosab, JosefaM. G Onzález-Pérezb, A. Urora, G. Sicilia-Z, ElenaB. Afrab, A. Ugella-, JuanN. Ltam Iranob, S-G Icló, UtiérrezbRequires cookie*
 Title    Synthesis, Structure and Properties of / > o/j-[(Ar-(2-Hydroxyethyl)- Af'-carboxymethyl-l,2-ethyIenediamine-AyV'-Diacetato)copper(II) Hydrate], {[Cu(Hhedta)] * H20 } n  
 Abstract    The stoichiometric reaction of /V-(2-hydroxyethyl)-1,2-ethylenediamine-/V,/V,7V'-triacetic acid [hbhedta = (H0CH2CH2)(H02CCH2)NC2H4N(CH2C02H)2)] and copper(II) hydroxy-carbo-nate in water yields crystalline samples of /?0/v-{(/V-(2-hydroxyethyl)-/V'-carboxymethyl-l,2-ethylenediamine-./V,./V'-diacetato)copper(II) hydrate}, {[Cu(Hhedta)] TTOjn (I)-The com­ pound was studied by TG analysis (with FT-IR study of the evolved gases), IR, electronic and ESR spectra, magnetic susceptibility data and single crystal X-ray diffraction methods. It crystallises in the orthorhombic system, space group Fdd2 (a = 21.906(2), b = 36.602(4), c = 6.928(1) A, Z = 16, and final R\ = 0.029 for 1554 independent reflections). The Cu(II) atom exhibits a very distorted octahedral coordination (type 4+1 + 1). The Hhedta ligand plays a yV,yV',0,C>',(9"-pentadentate chelating role as well as a O,0'-carboxylate bridging one and has a free /V-carboxymethyl arm. The bridging carboxylate group of the Hhedta ligand leads to polymeric chains {[Cu(Hhedta)] H20}n parallel the c axis. A hydrogen bonding network involves all O-H polar bonds (non-ionised carboxylic and alcoholic hydroxyl groups and water molecules). The structure reveals the preferred formation of a copper(II)-(/V-2-hydroxyethyl-amino) or copper(II)-(ethanolamino) versus a copper(II)-(/V-carboxymethylamino) chelate ring. In tro d u c tio n 
  Reference    Z. Naturforsch. 55b, 171—177 (2000); received October 10 1999 
  Published    2000 
  Keywords    Copper(II) Chelate, Crystal Structure, Amino-polycarboxylates, Ethanolamine 
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 Identifier    ZNB-2000-55b-0171 
 Volume    55 
26Author    W. PreetzRequires cookie*
 Title    Kristallstrukturen  
 Abstract    , Schwingungsspektren und Normalkoordinatenanalyse von ds-(«-Bu4N)2[ReBr4(NCS)2 ], c/s-(/*-Bu4N)2[ReBr4(NCSe)2 ] und cis-(w-Bu4N)2[ReBr4(NCS)(NCSe)] C rystal Structures, Vibrational Spectra and Norm al Coordinate A nalyses of c/s-(rc-Bu4N)2[ReBr4(N C S)2], c/s-(^-B u4N)2[ReBr4(NCSe)-,] and m -(n -B u 4N)2[ReBr4(N CS)(N CSe)] L. H om olya m-Tetrabromodithiocyanato(N)-rhenat(IV), m-Tetrabromodiselenocyanato(N)-rhenat(IV), m-Tetrabromo-thiocyanato(N)-selenocyanato(N)-rhenat(IV), Crystal Structure, Vibrational Spectra 
  Reference    Z. Naturforsch. 55b, 178—184 (2000); eingegangen am 9. Dezember 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0178 
 Volume    55 
27Author    FrancisoJ. Zuno-C, G. Ruzb, Loria Sanchez-C, M. Abrerab, J. Aria, RosalesbRequires cookie*
 Title    Bis(diphenylphosphanyl)amine and its Disulfide and Diselenide. Application of the INEPT-HEED Pulse Sequence for Measurement of 7 7(3 1 P,1 5 N) and Isotope Induced Chemical Shifts lA14/1 5 N(3 1 P) at Natural Abundance of 15N  
 Abstract    A m ines, Phosphorus, Sulfide, Selenide, NM R Data Bis(diphenylphosphanyl)am ine (1), the disulfide IS and diselenide lSe were selected to show the efficient application o f the INEPT-HEED pulse sequence for measuring coupling constants /7(31P.15N) and isotope induced chemical sh ifts1 Z\I4/I 5N (3IP), both at natural abundance o f 15N, from 'P NM R spectra. The si^n o f /7(3IP,I5N) (> 0) in all three compounds was determined by selective heteronuclear ]H { 1P} double resonance experiments. 
  Reference    Z. Naturforsch. 55b, 185 (2000); received December 6 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0185 
 Volume    55 
28Author    JorgeL. Jiosa, H.Requires cookie*
 Title    Synthesis, Multinuclear (JH, 13C and 1 7 0 ) Magnetic Resonance Spectroscopy and Conformational Analysis of Some Substituted Aryl Naphthoates  
 Abstract    elm ut D u d d eck 5 
  Reference    Z. Naturforsch. 55b, 189 (2000) 
  Published    2000 
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 Identifier    ZNB-2000-55b-0189 
 Volume    55 
29Author    JorgeL. Jiosa, H.Requires cookie*
 Title    Substituent Influences on the Keto-Enol Tautomerism in l-(2-Hydroxyphenyl)-3-#-and -/?-naphthylpropane-l,3-diones Monitored by *H and 13C NMR Spectroscopy  
 Abstract    elm ut D u d d eck b a Perm anent address: L A D E C O R , D e p artam en to de Qui'mica, Facultad de C iencias Exactas, U n iversidad N acional de La Plata, C alles 47 y 115, 1900 La Plata, A rgen tin a h U n iversität H annover, Institut für O rganische C hem ie. Sch n eid erb erg IB , D -30167 H annover, G erm any R eprint requests to Dr. Jorge L. Jios. E-m ail: jljios@ d alton .q uim ica.u n lp.edu .ar Z. Naturforsch. 55b, 1 9 3 -2 0 2 (2000); received S ep tem b er 27, 1999 l-(2-H y d ro x y p h en y l)-3 a -and /3-naph thylpropan -l,3-diones, K eto -E n o l Tautom erism , Substituent Influence, 'H N M R D ata, 13C N M R D ata Synthesis o f 18 l-(2-h y d ro x y p h en y l)-3 -a -and -/3-n ap h th ylp rop an -l,3-d ion es is described. Their 'H and 13C N M R spectra w ere co m p letely and unam biguou sly assign ed using a co m b i­ nation o f both hom o-and heteron u clear (g s-C O S Y), 'H -d ete cte d heteron u clear on e-b on d (gs-H M Q C) and long-range (gs-H M B C) correlation experim en ts. S u bstitu en t and con form a­ tion effects on the tautom eric equilibria w ere id en tified and in terp reted in term s o f steric and electronic contributions. 
  Reference    Z. Naturforsch. 55b, 193 (2000) 
  Published    2000 
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 Identifier    ZNB-2000-55b-0193 
 Volume    55 
30Author    Z. NaturforschRequires cookie*
 Title    Chiral Aryl Sulfonyl Hydantoins as Hypoglycemic Agents  
 Abstract    R osh an A h m ad 3 *, R ukhsana Jab een 3, M oham m ad Z ia-ul-H aq3, H um aira N adeem 3 H elm ut D u d d eck b, and E ugen J. V erspohl0 Some novel chiral sulfonyl hydantoin derivatives 2 a -e and 3 a -e have been prepared. p-Toluenesulfonyl chloride on treatment with L-amino acids in presence of K2C 0 3/H 20 yielded /V-(/7-toluensulfonyl-)amino acids la -e which were cyclized in presence of N H 4SCN / A c20 to afford l-(p-toluenesulfonyl)-5-substituted-2-thiohydantoins 2a-e. These compounds were oxidized with H N 0 3 to yield l-(p-toluenesulfonyl)-5-substituted hydantoins 3a-e. The enantiomeric ratios of 3 a -e were determined by 'H NM R spectroscopy using E u(hfc)3. The antidiabetic activity of 3a-d has been determined. 
  Reference    Z. Naturforsch. 55b, 203 (2000); received September 2 1999 
  Published    2000 
  Keywords    Hydantoins, Antidiabetic Activity, NM R Data 
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 Identifier    ZNB-2000-55b-0203 
 Volume    55 
31Author    Requires cookie*
 Title    Endogenous Alkaloids in Man, Part 33 [1]. Dimethyl (2S,4S)-and (2/?,4S)-5,5-Dimethyl-l,3-thiazolidine-2,4-dicarboxylates, Two Diastereomeric Glyoxylate-Derived Heterocycles  
 Abstract    Reprint requests to Prof. Dr. G. Bringmann. Fax: (49) 931 888 4755. E-mail: bringman@chemie.uni-wuerzburg.de Z. Naturforsch. 55b, 2 0 8 -2 1 2 (2000): received D ecem ber 13, 1999 Crystal Structure, Glyoxylate-Derived 1,3-Thiazolidines Both title compounds were obtained in stereochemically pure form by refluxing 5,5-di­ m ethyl-1 ,3-thiazolidine-2,4-dicarboxylic acid (3) with m ethanolic HC1, follow ed by a separa­ 
  Reference    Z. Naturforsch. 55b, 208 (2000) 
  Published    2000 
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 Identifier    ZNB-2000-55b-0208 
 Volume    55 
32Author    Jürgen Schatz3, Frank Schildbacha, AxelL.Requires cookie*
 Title    The Inclusion of Carbon Disulfide in /?-rerf-Butylcalix[4]-and [6 ]arene - A Combined Crystallographic and Vibrational Spectroscopic Study  
 Abstract    en tzb, Sylvia R a stä tte rb, Joachim Schilling5, Jö rg D o rm an n c, A n d reas R uoffc, and Tony D eb ae rd em ae k erd The inclusion complexes formed from carbon disulfide and /?-r£7-r-butylcalix[4]arene (1 C S 2) or /?-rm-butylcalix[6]arene (2-C S2) were investigated by X-ray crystal structure analysis, infrared (IR) and Raman spectroscopy. The complex 1 C S 2 crystallises in the space group P4/n, 2 C S 2 in the space group P2xln. In case of /?-rm-butylcalix[4]arene as host the carbon disulfide molecule is included in the cavity. In the crystal structure of p-rm -butylcali-x[6]arene clathrate, self-com plexation o f one rm-butyl group in the cavity o f another ca-lix[6]arene can be observed. Due to inclusion, the symmetry of CS2 is lowered both in the p-rm -butylcalix[4]arene and p-rm-butylcalix[6]arene case causing significant shifts in the fully assigned infrared and Raman spectra. 
  Reference    Z. Naturforsch. 55b, 213—221 (2000); received N ovem ber 16. 1999 
  Published    2000 
  Keywords    p-rerz-Butylcalixarenes, Inclusion Complexes, Crystal Structure, IR Data, Raman Data 
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 Identifier    ZNB-2000-55b-0213 
 Volume    55 
33Author    DelS. GirgisRequires cookie*
 Title    Facile Regioselective Synthesis of l,2,6,8-Tetraazaspiro[4.4]nona-2,6-dien-9-ones  
 Abstract    5(4//)-O xazolones, 4//-Im idazol-4-ones, Hydrazonoyl Chlorides, l,2,6,8-Tetraazaspiro[4.4j-nona-2,6-dien-9-ones, Dipolar Cycloaddition 1,3-Dipolar cycloaddition reaction of nitrilimines to a variety of 3-aryl-5-arylmethylidene-3,5-dihydro-2-phenyl-4//-im idazol-4-ones (3) afforded the corresponding 1,3,4,7,8-pentaaryl-l,2,6,8-tetraazaspiro[4.4]-nona-2,6-dien-9-ones (4) and not the regio-isomers 2,3,6,8,9-penta-aryl-l,3,7,8-tetraazaspiro[4.4]nona-l,6-dien-4-ones (5) in high regioselectivity. 
  Reference    Z. Naturforsch. 55b, 222 (2000); received N ovem ber 2 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0222 
 Volume    55 
34Author    H.E JRequires cookie*
 Title    A New Triterpenoidal Saponin from the Bark of Guaiacum officinale L  
 Abstract    A new triterpenoidal saponin, akebonic acid-3-0-[a-L-rham nopyranosyl-(1^3)-/3-D-glu-copyranosyl-(l—»3)-a-L-rhamnopyranosyl-(l—*2)-a-L-arabinopyranoside], named as guaia­ nin Q (1), was isolated from the n-butanolic extract of the bark of Guaiacum officinale L. The structure of 1 was established with the help of the comparative studies of ID and 2D ' H -13C NM R methods, FABMS, alkaline and acid hydrolyses. In addition to 1, a number of known saponins were also isolated and reported from the same source. 
  Reference    Z. Naturforsch. 55b, 227 (2000); received August 27 1999 
  Published    2000 
  Keywords    Guaianin Q, Triterpenoid Saponin, Bark, Guaiacum officinale L, Zygophyllaceae 
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 Identifier    ZNB-2000-55b-0227 
 Volume    55 
35Author    G. C. Papavassiliou, G.A M Ousdis, A. PapadimRequires cookie*
 Title    A lternative M ethod for the Preparation o f 4 ,5-E th ylen ed ith io-l,3-d ith iole-2- thione and R elated C om pounds  
 Abstract    The compounds 4,5-ethylenedithio-l,3-dithiole-2-thione, 4,5-(methyl) ethylenedithio-l,3-dithiole-2-thione and 4,5 (dimethyl) ethylenedithio-1,3-dithiole-2-thione were prepared by reaction of l,3-dithiole-2,4,5-trithione with ethylene, propyl­ ene and //w?s-2-butene, respectively. The prepara­ tive and spectroscopic data are identical with those obtained from the corresponding authentic samples. 
  Reference    Z. Naturforsch. 55b, 231 (2000); received D ecem ber 6 1999 
  Published    2000 
  Keywords    Cycloaddition, Thiones, jr-Donor M olecules, Organic Conductors 
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 Identifier    ZNB-2000-55b-0231_n 
 Volume    55 
36Author    Z. NaturforschRequires cookie*
 Title    Salvia palaestina  
 Abstract    Salvia palaestina, Labiatae, Diterpenoid, 2,3-seco-19(4^3)-a£>eo-abietane Derivative, Salvipalolide 
  Reference    Z. Naturforsch. 55b, 233 (2000); received N ovem ber 16 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0233_n 
 Volume    55 
37Author    Wolfgang Sixta, Wilhelm Kaim3, PreetzbRequires cookie*
 Title    Torsten  
 Abstract    Reaction of OsCf, with pentamethylcyclopentadiene in ethanol in air yields the ionic os-mium(IV) compound [Cp*2 0 sCl]2[0 sCl6] which has been identified structurally and by vi­ brational spectroscopy. Under comparable conditions the RuCb homologue yields the ruthe-nium(III) compound [Cp'R uC bh, illustrating the more facile oxidation of the 5d element to the tetravalent state. 
  Reference    Z. Naturforsch. 55b, 235—237 (2000); received December 17 1999 
  Published    2000 
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 Identifier    ZNB-2000-55b-0235 
 Volume    55 
38Author    A.B M Sham, Rahm An, H. Boiler, K. O. KleppRequires cookie*
 Title    Synthesis and Spectroscopic Investigations of New Linear Heterobimetallic Clusters [Me4N]3[(TOS3 )2Ag] (T = Mo, W). Crystal Structure of [Me4N]3[(MoOS3 )2 Ag]  
 Abstract    Red-brown crystals of a new bis(thiomolybdate) complex [Me4N]3[(MoOS3)2Ag] were formed at room temperature through the reaction of a solution of [Me4N]2[MoOS3] in MeCN with solid AgCN. They are monoclinic, space group P2i/c with unit cell parameters a = 16.662(9), b = 9.464(3), c = 17.890(8) A, /3 = 101.87(2)°, Z = 4. The crystal structure was determined from single crystal diffractometer data (MoKa-radiation) and refined to R = 0.044 (3614 reflections, 236 variable parameters). The structure is characterized by trinuclear complex anions, [(MoOS3)2Ag]3~. According to Weissenberg investigations the homologous tungsten compound is isostructural. The infrared spectrum of the molybdenum complex (KBr powder) shows absorption bands at 884 (vs) and 871 (w) cm-1 (terminal i/(Mo-0)), 483 (vs) cm-1 (terminal i/(Mo-S)), 451 (vs), and 435 (w) cm-1 (bridging i/(Mo-S)). The tungsten complex showed bands at 901 (vs) cm-1 (terminal ^(W-O)), 478 (vs) cm-1 (terminal u(W-S)), and 435 (vs) cm-1 (bridging ^(W-S)). The anionic mass spectra shows molecular ion peaks at m/z 524 and 700 for [(MoOS3)2Ag]_ and [(WOS3)2Ag]~, respectively, as well as peaks for other fragments. 
  Reference    Z. Naturforsch. 55b, 238—242 (2000); received Oktober 10 1999 
  Published    2000 
  Keywords    IR Data, Chalcogenides, Molybdenum, Tungsten 
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 Identifier    ZNB-2000-55b-0238 
 Volume    55 
39Author    M. Etallic, R. Adii, Ionic Radii, Valences, F. Solid, M. Etallic, Elem Ents, M. Artin, Tröm El, HerrnRequires cookie*
 Title    Metallradien, Ionenradien und Wertigkeiten fester metallischer Elemente  
 Abstract    Metallic radii rm are correlated with the ionic radii r, by linear relationships. For groups 1 up to 7 as well as for AI, Ga, In, Tl, Sn, and Pb the ionic radii refer to the maximum valences (oxidation states) as known from compounds according to rm « 1.16 • (r, + 0.64) [A], For groups 8 up to 12, rm « 0.48 • (rs + 2.26) [A] with valences W = 14 -G (G = group number). These valences are considered regular (Wr). For groups 1 up to 12, they obey the equation Wr = 7 -IG -71. According to this equation all outer s electrons and the unpaired d electrons should be involved in chemical bonding, i.e. in the cohesion of the element in the solid state. From the melting temperatures and the atomic volumes it is concluded, however, that only 19 out of the 30 d-block elements have regular valences, namely the elements of groups 3, 5, 6, 10, 11 as well as Os, Ir, Zn, Cd, and possibly Ru. All of the non-regular valences are lower than the regular ones. Four of them are integers: Mn 3; Fe, Co 4; Re 6. M etallradien 
  Reference    Z. Naturforsch. 55b, 243—247 (2000); eingegangen am 2. Dezember 1999 
  Published    2000 
  Keywords    Metallic Radii, Ionic Radii, Metallic Valence, Atomic Volume 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0243.pdf 
 Identifier    ZNB-2000-55b-0243 
 Volume    55 
40Author    Karl Hensena, Ralf Mayr-Steina, Björn Spangenberg3, Michael Bolteb, Stephan RühlbRequires cookie*
 Title    Komplexe gemischter Siliciumhalogenide mit 3,4-Lutidin Complexes o f M ixed Silicon Halides with 3,4-Lutidine  
 Abstract    The first single crystal X-ray investigations of 3,4-lutidine complexes with mixed silicon tetrahalides were carried out. 
  Reference    Z. Naturforsch. 55b, 248—252 (2000); eingegangen am 22. November 1999 
  Published    2000 
  Keywords    Coordination Chemistry, Halogen Exchange, Silicon 
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 TEI-XML for    default:Reihe_B/55/ZNB-2000-55b-0248.pdf 
 Identifier    ZNB-2000-55b-0248 
 Volume    55 
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