| | 21 | Author
| Henri Brunner, M. Arkus, N. Iem Etz, M. Anfred Zabel | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0145.pdf | | | | Identifier
| ZNB-2000-55b-0145 | | | | Volume
| 55 | |
| 22 | Author
| Z. Naturforsch | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0155.pdf | | | | Identifier
| ZNB-2000-55b-0155 | | | | Volume
| 55 | |
| 23 | Author
| 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 Estb | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0162.pdf | | | | Identifier
| ZNB-2000-55b-0162 | | | | Volume
| 55 | |
| 24 | Author
| C. Bender, D. W. Ulff-M, H. Older, F. Vogt, M. M. Ritschl, Eisel | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0167.pdf | | | | Identifier
| ZNB-2000-55b-0167 | | | | Volume
| 55 | |
| 25 | Author
| 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, Utiérrezb | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0171.pdf | | | | Identifier
| ZNB-2000-55b-0171 | | | | Volume
| 55 | |
| 26 | Author
| W. Preetz | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0178.pdf | | | | Identifier
| ZNB-2000-55b-0178 | | | | Volume
| 55 | |
| 27 | Author
| FrancisoJ. Zuno-C, G. Ruzb, Loria Sanchez-C, M. Abrerab, J. Aria, Rosalesb | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0185.pdf | | | | Identifier
| ZNB-2000-55b-0185 | | | | Volume
| 55 | |
| 29 | Author
| 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0193.pdf | | | | Identifier
| ZNB-2000-55b-0193 | | | | Volume
| 55 | |
| 30 | Author
| Z. Naturforsch | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0203.pdf | | | | Identifier
| ZNB-2000-55b-0203 | | | | Volume
| 55 | |
| 31 | Author
| | 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0208.pdf | | | | Identifier
| ZNB-2000-55b-0208 | | | | Volume
| 55 | |
| 32 | Author
| 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0213.pdf | | | | Identifier
| ZNB-2000-55b-0213 | | | | Volume
| 55 | |
| 33 | Author
| DelS. Girgis | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0222.pdf | | | | Identifier
| ZNB-2000-55b-0222 | | | | Volume
| 55 | |
| 34 | Author
| H.E J | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0227.pdf | | | | Identifier
| ZNB-2000-55b-0227 | | | | Volume
| 55 | |
| 35 | Author
| G. C. Papavassiliou, G.A M Ousdis, A. Papadim | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0231_n.pdf | | | | Identifier
| ZNB-2000-55b-0231_n | | | | Volume
| 55 | |
| 37 | Author
| Wolfgang Sixta, Wilhelm Kaim3, Preetzb | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0235.pdf | | | | Identifier
| ZNB-2000-55b-0235 | | | | Volume
| 55 | |
| 38 | Author
| A.B M Sham, Rahm An, H. Boiler, K. O. Klepp | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0238.pdf | | | | Identifier
| ZNB-2000-55b-0238 | | | | Volume
| 55 | |
| 39 | Author
| M. Etallic, R. Adii, Ionic Radii, Valences, F. Solid, M. Etallic, Elem Ents, M. Artin, Tröm El, Herrn | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0243.pdf | | | | Identifier
| ZNB-2000-55b-0243 | | | | Volume
| 55 | |
| 40 | Author
| Karl Hensena, Ralf Mayr-Steina, Björn Spangenberg3, Michael Bolteb, Stephan Rühlb | Requires 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 | | | |
Similar Items
| Find | | | DEBUG INFO
| | | | | TEI-XML for
| default:Reihe_B/55/ZNB-2000-55b-0248.pdf | | | | Identifier
| ZNB-2000-55b-0248 | | | | Volume
| 55 | |
|
