| | 1 | Author
| Claus Feldm, M. Artin, Jansen5 | Requires cookie* | | | Title
| O ptische A b sorp tion der A uride M3A11O ( Optical Absorption of the Aurides M3AuO (M = K, Rb, Cs)  | | | | Abstract
| The optical absorption of the aurides M3AuO (M = K, Rb, Cs) and CsAu has been determ inated by UV/VIS spectroscopy. The band gaps have been found to be 2,35(2) eV (Cs3AuO) and 2,30(2) eV (CsAu). This corresponds to a more pronounced anionic character of gold in Cs3AuO as com pared to CsAu. In the case of K3AuO and R b3AuO no band gap was detectable. | | | |
Reference
| Z. Naturforsch. 51b, 607—608 (1996); eingegangen am 24. Juli 1995 | | | |
Published
| 1996 | | | |
Keywords
| Aurides, Optical A bsorption, UV-VIS Spectra | | | |
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| default:Reihe_B/51/ZNB-1996-51b-0607_n.pdf | | | | Identifier
| ZNB-1996-51b-0607_n | | | | Volume
| 51 | |
| 2 | Author
| Hans Bock, Klaus Ziemer, Christian Näther, Holger Schödel, Markus Kleine, Mark Sievert | Requires cookie* | | | Title
| Donator/Akzeptor-Komplexe von Alkyl-und Aminobenzolen, Anthracen oder Pyren mit l,3,5-Cyan-/Nitro-benzolen: Kristallisation, Strukturen und Elektronenspektren Interactions in Crystals, 89 [ 1 -3] Donor/Acceptor Complexes of Alkyl and Aminobenzenes, Anthracene or Pyrene and 1,3,5-Cyano/nitro-benzenes: Crystallisation, Structures and Electronic Spectra | | | | Abstract
| The following mixed-stack donor/acceptor complexes {D • • • A}00 have been cry stallized and their structures determined: {hexam ethylbenzene--3,5-dicyano-l-nitroben zene hexamethylbenzene---3,5-dinitro-l-cyanobenzene}^, {pyrene- • -3,5-dinitro-l-cyano-ben zen e}^ , {anthracene---(3,5-dinitro-l-cyanobenzene)2}oo, {N,N-dimethylanilin---3,5-di-nitro-l-cyanobenzene}^ and { l^-phenylenediam ine-'-S^-dinitro-l-cyanobenzene}^. Their lattice packing consists of parallel layers, which contain either donors and acceptors as for hexamethylbenzene and pyrene or composite ones as in the 1:2 complex of anthracene with each one of the acceptors above and below its peripheral rings. The isostructural hexamethyl benzene complexes exhibit almost identical packing coefficients as well as a hexagonal coplanar arrangement of the C6(CH 3)6 donors. Weak intermolecular van der Waals interactions are also observed between antiparallel cyano substituents. The interplanar n distances range between 334 and 353 pm, /. e. around 340 pm of two van der Waals n radii. In none of the complexes, however, significant structural changes in either the donor or the acceptor components due to the complex formation are observed. In both the crystals as well as in solution, the donor/acceptor complexes exhibit colours between yellow and red; their long-wavelength charge transfer ab sorption maxima, therefore, correspond to a lowering in excitation energy of only up to 1 eV relative to that of the components. The different charge transfer in the ground and the CT excited states is also discussed referring to other data such as vertical first ionization energies or interplanar distances {D---A}, as well as to results from semiempirical calculations based on the crystal structure data determined and including approximate configuration interaction. Wechselwirkungen in Kristallen, 89 [1 -3] A u sgan gsp u n k te | | | |
Reference
| Z. Naturforsch. 51b, 1538—1554 (1996); eingegangen am 27. Dezember 1995 | | | |
Published
| 1996 | | | |
Keywords
| Donor/Acceptor-Complexes, Single Crystal Structures, UV/VIS Spectra | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1538.pdf | | | | Identifier
| ZNB-1996-51b-1538 | | | | Volume
| 51 | |
| 4 | Author
| W. Preetz, P. Hollmann, G. Thiele, H. Hillebrecht | Requires cookie* | | | Title
| Darstellung, Reaktionen und spektroskopische Charakterisierung von |O s2X8|2", X = Cl, Br, I, und Kristallstruktur von (P P N )2|O s2I8| * 2 CH2C12 Preparation, Reactions and Spectroscopic Characterization of [Os2X 8]2-, X = Cl, Br, I, and Crystal Structure o f (PPN )2[Os2I8] ■ 2 C H 2C12 | | | | Abstract
| The triply bonded octahalogenodiosm ate(III) anions [Os2X 8]2-, previously known with X = Cl, Br, have now been extended to include the iodide with two staggered OsI4 units. This com pound was prepared by treating [Os2Cl8]2' with N al at room temperature in acetone solu tion. The structure determination by X-ray diffractometry on single crystals o f (P P N)2[Os2I8] • 2 C H 2C12, reveals crystallization in the m onoclinic system, space group P 2 ,/c with Z = 4. The O s~O s triple bond is with 2.212(1) Ä the longest within the three octahalogenodiosm ates(III). The Raman spectra show v(OsOs) at 285, [Os2Cl8]2-; at 287, [Os2Br8]2_ and for the iodo compound at 270.1 cm ' 1 with up to three overtones. The spectro scopic constants are calculated to be a», = 270.9 cm -1; X u = -0 .5 0 cm "1. The 10 K UV-VIS spectra o f solid [(/7-C4H9)4N ]2[Os2X 8] exhibit ö~n* transitions with maxima at 723, 690 and 643 nm, superimposed by vibrational fine structures with long progressions o f 195, 211 and 183 cm -1 for X = Cl, Br, I, respectively. Oxidation o f [Os2X 8]2~, X = Cl, Br with the corresponding halogen leads to the cleavage o f the O s -O s bond, and the dekahalogenodiosm ates(IV), [Os2X l0]2-, are formed. | | | |
Reference
| Z. Naturforsch. 45b, 1416—1424 (1990); eingegangen am 12. März 1990 | | | |
Published
| 1990 | | | |
Keywords
| O ctaiododiosm ate(III), Synthesis, Crystal Structure, Raman, UV-VIS Spectra | | | |
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| default:Reihe_B/45/ZNB-1990-45b-1416.pdf | | | | Identifier
| ZNB-1990-45b-1416 | | | | Volume
| 45 | |
| 5 | Author
| M. =. Re, Tc, X. =. Ci, BrJ. Skowronek, W. Preetz | Requires cookie* | | | Title
| Schwingungsspektren und Normalkoordinatenanalyse der Acetatohalogenodimetallate M 2( 0 2CCH3)4X2, M = Re, Tc; X = CI, Br Vibrational Spectra and Norm al Coordinate Analysis of Acetatohalogenodim etalates M 2( 0 2C CH 3)4X | | | | Abstract
| The orange-red Tc2(0 2C C H 3)4Br2 has been prepared for the first time by reaction of [Tc2Brg]2_ with glacial acetic acid and acetic anhydride. The IR and R am an spectra have been recorded at 80 K and are compared with those of the analogous com pounds Tc2(0 2CC H 3)4C12, Re2(0 2C C H 3)4Cl2 and Re2(0 2CC H 3)4Br2. The assignment according to the point group D 4h is supported by normal coordinate analysis based on a general valence force field. The quadruple M -M bond is stabilized by the bridging acetato and destabilized by the axial halogeno ligands. The valence force constants fd(MM) are determined to 3,96-4,08 mdyn/A. The inter action constants fdd(M M /M X), fdd(M M /M O) and fJM M /M M O) are ab o u t three times high er for the technetates as compared with the rhenates. The stronger interaction between oppo site bonds in the equatorial ligand sphere is revealed by the stretching interaction constants d d '' which are about two times higher than fdd for M -O bonds at right angles. The strong coupling of the ring co-ordinates implies extensive mixing of the M -O valence and deform ation modes. The electronic spectra of Tc2(0 2CC H 3)4X, agree with those of the corresponding Re com pounds. | | | |
Reference
| Z. Naturforsch. 47b, 482—490 (1992); eingegangen am 10. Oktober 1991 | | | |
Published
| 1992 | | | |
Keywords
| Tetraacetatodihalogenodirhenates, Tetraacetatodihalogenoditechnetates, Vibrational Spectra, UV-Vis Spectra, Normal Coordinate Analysis | | | |
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| default:Reihe_B/47/ZNB-1992-47b-0482.pdf | | | | Identifier
| ZNB-1992-47b-0482 | | | | Volume
| 47 | |
| 7 | Author
| Christian Reichardt, Ulrich Rust | Requires cookie* | | | Title
| Synthesen mit aliphatischen Dialdehyden, XXXII [1] Darstellung und Reaktionen N-substituierter 2-Aminomalondialdehyde Syntheses with Aliphatic Dialdehydes, XXXII [1] Syntheses and Reactions of N-Substituted 2-Aminomalondialdehydes | | | | Abstract
| The 2-amino malondialdehyde bis[dimethylacetal] 2 and some of its N-monosubstituted derivatives 7 a-d as well as the o-carboxy benzoyl malondialdehyde 12 have been prepared. With heterocyclic imonium salts these amino malondialdehyde derivatives form, by a twofold condensation reaction, the y-acylamino-substituted pentamethine cyanine dyes 15 a-c, 17, and 18a-b, the UV/Vis and 13 C NMR spectra of which are recorded with respect to the influence of the y-substituent on these spectra. | | | |
Reference
| Z. Naturforsch. 37b, 236—245 (1982); eingegangen am 22. September 1981 | | | |
Published
| 1982 | | | |
Keywords
| 2-Aminomalondialdehyde Derivatives, y-Acylaminopentamethinecyanine Dyes, UV/Vis Spectra, 13 C NMR Spectra | | | |
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| default:Reihe_B/37/ZNB-1982-37b-0236.pdf | | | | Identifier
| ZNB-1982-37b-0236 | | | | Volume
| 37 | |
| 8 | Author
| Horst Elias, Elke Hilms, Helmut Paulus | Requires cookie* | | | Title
| X-Ray Structures and Spectral Properties of 4-Coordinate Copper(II) and Palladium(II) Complexes with a Tridentate ONN-Schiff Base Ligand | | | | Abstract
| The tridentate mono-basic Schiff base N-(2-diethylaminoethyl)salicylaldimine =Hsal-en-NEt2 forms complexes 1 = [(sal-en-NEt2)MY] with divalent metals M (Y = halide). The preparation of three copper(II) complexes la (Y = Br), lb (Y = Cl), and lc (Y = SCN) and one palladium(II) complex 1(1 (Y = Cl) is described and the UV/VIS spectra of these complexes in methanol and chloroform are compared and discussed. The crystals of la • CHCI3, lb • CHCI3, and Id • CHCI3 are all isotypic and crystallize in the ortho-rhombic space group Pbca, whereas the solvent-free crystals of 1 b (and also 1 a) are monoclinic with the space group P2i/c. The metal is 4-coordinate with an almost planar ONNY donor atom arrangement around the palladium and with a distorted arrangement around the copper. The crystals consist of separate non-bridged complex units and the chloroform is not coordinated. | | | |
Reference
| Z. Naturforsch. 37b, 1266—1273 (1982); received March 31 1982 | | | |
Published
| 1982 | | | |
Keywords
| X-ray, UV/VIS Spectra, Tridentate ONN Schiff Base, Copper(II) Complexes, Palladium(II) Complexes | | | |
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| default:Reihe_B/37/ZNB-1982-37b-1266.pdf | | | | Identifier
| ZNB-1982-37b-1266 | | | | Volume
| 37 | |
| 10 | Author
| M. Ohsen, Safarpour Haghighi, Heiner Homborg | Requires cookie* | | | Title
| Darstellung und Eigenschaften von Bis(phthalocyaninato)lanthanaten und -ceraten Preparation and Properties o f Bis(phthalocyaninato)lanthanates and -cerates | | | | Abstract
| High yields of bisphthalocyaninates of lanthanum and cerium have been obtained in the strongly exothermic reaction of the dehydrated lanthanoid acetates with molten 1,2-di-cyanobenzene in the presence of potassium hydroxide or methylate. Salts of the type (cat)[M(Pc(2-))-,] (M = La, Ce) with different cations (cat+ = K. Bu4N, PNP. TDOA) have been isolated. The corresponding "Hydrogen salts" are obtained by thermal decomposition of (Bu4N)[M(Pc(2-))-,] at T > 350 C. The dimeric structure is confirmed by negative fast atom bombardement mass spectra. The redox properties have been investigated by cyclovoltam-metry and UV, VIS, MIR, FIR and resonance Raman (RR) spectra are reported. Electronic transitions between 2000 and 3000 cm 1 are observed in the low temperature RR spectra of (Bu4N)[Ce(Pc(2-))^] being RR enhanced at 470 nm. From the assignment to the higher transi tions within the symmetry split 5F5/2, :F7 manifolds of the f1 ground state of Ce3+ the crystal field parameters f4f = 610.5, B40 = 242.2 and B60 = 4.1 cm-1 have been determined. | | | |
Reference
| Z. Naturforsch. 46b, 1641—1649 (1991); eingegangen am 18. Juni 1991 | | | |
Published
| 1991 | | | |
Keywords
| Bis(phthalocyaninato)lanthanates Bis(phthalocyaninato)cerates, Vibrational Spectra, UV-VIS Spectra, Electronic Raman Spectra | | | |
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| default:Reihe_B/46/ZNB-1991-46b-1641.pdf | | | | Identifier
| ZNB-1991-46b-1641 | | | | Volume
| 46 | |
| 11 | Author
| Ramesh Kapoor, Pratibha Kapoor, Ramneek Sharma | Requires cookie* | | | Title
| Reactions of Chromyl Chloride with Carboxylic Acids and Carboxylic Acid Anhydrides | | | | Abstract
| Chromyl Chloride reacts with carboxylic acids [RCOOH where R — C2H5, AZ-C3H7, CH2CI, CHC1 2 and CCI3] to give reduced chromium(III) carboxylates, [Cr 3 0(00CR) 6 (H 2 0) 3 ]Cl. Magne-tic susceptibility, UV-visible and IR measurements are all consistent with their trinuclear basic structures. Reactions of chromyl chloride with carboxylic acid anhydrides [(RCO) z O where R = CH 3 , C 2 H 5 and «-C 3 H 7 ] give dinuclear oxo-bridged complexes of the type, [Cr 2 0(00CR) 3 ]Cl. These compounds behave as non-electrolytes in polar organic solvents. IR spectra suggest the presence of bridging carboxylato groups containing Cr—O — Cr chains. Their low magnetic mo-ment values suggest polymeric structures exhibiting antiferromagnetic coupling between Cr atoms. | | | |
Reference
| Z. Naturforsch. 40b, 247—250 (1985); received October 17 1984 | | | |
Published
| 1985 | | | |
Keywords
| Chromyl Chloride, Trinuclear Basic Chromium(III) Carboxylate, Dinuclear Oxochromium(III) Carboxylate, Magnetic Susceptibility, IR Spectra, UV-Vis Spectra | | | |
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| default:Reihe_B/40/ZNB-1985-40b-0247.pdf | | | | Identifier
| ZNB-1985-40b-0247 | | | | Volume
| 40 | |
| 12 | Author
| Z. Naturforsch | Requires cookie* | | | Title
| Elektronentransfer und Ionenpaar-Bildung | | | | Abstract
| , 47 [1] Titrationen von 1,2,4,5-Tetracyanbenzol und 7,7,8,8-Tetracyan-/;-chino-dimethan mit Natriummetall in aprotischen Lösungen E le ctro n T ran sfer an d Ion P air F o rm atio n , 47 [ 1 ] T itratio n s o f 1,2 ,4 ,5 -T etracy an o b en zen e and 7 ,7 ,8 ,8 -T etracy an o -/?-q u in o d im eth an e w ith S o d iu m M etal in A p ro tic S o lu tio n s H an s B ock*, M a rk u s K leine | | | |
Reference
| Z. Naturforsch. 51b, 1215—1221 (1996); eingegangen am 25. Januar 1996 | | | |
Published
| 1996 | | | |
Keywords
| 1, 2, 4, 5-Tetracyanobenzene, 7, 7, 8, 8-Tetracyano-/?-quinodimethane, Sodium Metal Reduction, UV/VIS Spectra | | | |
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| default:Reihe_B/51/ZNB-1996-51b-1215.pdf | | | | Identifier
| ZNB-1996-51b-1215 | | | | Volume
| 51 | |
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