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  • 1
    Electronic Resource
    Electronic Resource
    MarkSim (2000)
    Springer
    Semigroup forum 92 (2000), S. 445-453 
    Details
    ISSN: 1432-2137
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: 2 ) and evaluates the model parameters for that point. The application currently contains surfaces for Latin America and Africa, and other regions will later be added. Use of the software is demonstrated by generating daily weather data files for running one of the DSSAT crop models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/
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  • 2
    Electronic Resource
    Electronic Resource
    Low-temperature redetermination of the structures of three gold compounds (1992)
    Springer
    Journal of chemical crystallography 22 (1992), S. 397-401 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The structure of KAuCl4 (1), previously reported in the non-centrosymmetric space groupPc, has been successfully redetermined inP21/c; the gold atoms occupy centers of symmetry. The scatter of chemically equivalent bond lengths is greatly reduced and the precision of bond lengths and angles correspondingly improved. The structure of Cl3PAuCl (2), determined in 1962, has been redetermined to obtain more precise values for molecular dimensions; new values are Au-P 2.198, Au-Cl 2.279(2)Å. Short Au⋯Au contacts (3.081 Å) connect the molecules in chains. The structure of Ph3PSAuCl (3), for which a very long Au-Cl bond (2.555 Å) had been reported, was redetermined and gave a normal Au-Cl bond length of 2.265(2) Å; the previous value was probably a typing error. All redeterminations were carried out at −95°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01195399
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  • 3
    Electronic Resource
    Electronic Resource
    Trinuclear Gold(I) Complexes with Various Coordination Modes of N,N-dimethyldithiocarbamate (2000)
    Springer
    Journal of cluster science 11 (2000), S. 153-167 
    Details
    ISSN: 1572-8862
    Keywords: gold ; dithiocarbamate ; tris(diphenylphosphino)methane ; gold–gold interactions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract The compounds [Au3(S2CNMe2)3{μ 3-(PPh2)3CH]} (1) and [Au3(S2CNMe2)(μ-S2CNMe2){μ 3-(PPh2)3CH}]ClO4 (2) are obtained by reaction of [Au3Cl3{μ 3-(PPh2)3CH}] with three equivalents of sodium dimethyldithiocarbamate or two equivalents of the same reagent in the presence of excess NaClO4. Reaction of 2 with the group 11 metal complexes [AuCl(tht)], CuCl or [Au(C6F5)(tht)] takes place with displacement of [M(S2CNMe2)]n (M=Cu, Au) and formation of the new complexes [Au3X(μ-S2CNMe2){μ 3-(PPh2)3CH}]ClO4 (X=Cl (3), X=C6F5 (4)); further reaction of 3 with [Ag(OClO3)(tht)] (tht=tetrahydrothiophene) affords the dicationic species [Au3(μ-S2CNMe2){μ 3-(PPh2)3CH}(tht)](ClO4)2 (5). Treatment of [Au3Cl3{μ 3-(PPh2)3CH}] with one equivalent of NaS2CNMe2 allows the substitution of only one chlorine atom, giving rise to the complex [Au3Cl2(S2CNMe2){μ 3-(PPh2)3CH}] (6), in which the dithiocarbamate ligand acts as monodentate rather than bidentate bridging as observed in compounds 3–5. The crystal structures of complexes 1 and 2 have been established by X-ray diffraction studies and show close gold–gold contacts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009068916229
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  • 4
    Electronic Resource
    Electronic Resource
    Structure of an Inclusion Compound of 28,28,35,35-Tetramethyl-11-oxo-1,4,18,21-tetraoxa[4,1,4,1,1]paracycloph ane with para-Xylene (1999)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 34 (1999), S. 267-276 
    Details
    ISSN: 1573-1111
    Keywords: tetraoxaparacyclophane complex ; preparation ; crystal structure ; clathrate
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The structure of the 2:3 complex between cyclophane 1 and para-xylene has been determined by a single crystal X-ray diffraction study at 143 K. One para-xylene molecule is enclosed within the cavity formed by two molecules of the host cyclophane; this ensemble displays crystallographic inversion symmetry. The other independent para-xylene molecule is located on a general position in the intermolecular cavities of the crystal lattice. The complex crystallizes in the triclinic space group P(-1) with a = 10β = 89.51(3), γ = 87.26(2)°, and Z = 1. Refinement based on 7539 unique reflections led to a final R(F) value of 0.0609.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008085829837
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  • 5
    Electronic Resource
    Electronic Resource
    Synthesis of Functionalized Aza-macrocycles and the Application of Their Metal Complexes in Binding Processes (2000)
    Springer
    Journal of inclusion phenomena and macrocyclic chemistry 37 (2000), S. 39-57 
    Details
    ISSN: 1573-1111
    Keywords: aza-macrocycles ; cyclen ; cyclam ; Lewis-acids ; metal complexes ; coordinative bonds
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Although aza-macrocycles have beenthoroughly investigated ever since their discoverybecause of their interesting binding properties,recent applications of their metal complexes inmedical concepts or as binding sites for recognitionin water have increased the demand for efficientsyntheses of functionalized derivatives. We presenthere two approaches to functionalized aza-macrocycles:substituted cyclams have been obtained byheterogeneous hydrogenation of unsaturatedheterocycles, and with established coupling methodsfrom peptide chemistry the selective introduction offunctional groups and tethering of cyclens wasachieved. The ability of Lewis-acidic complexes ofsuch substituted aza-macrocycles to reversibly formdefined aggregates even in neutral aqueous solutionwas demonstrated with the synthesis of an electrondonor – electron acceptor dyad, which is capable ofundergoing a very efficient intramolecular photoinducedelectron transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008083528325
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  • 6
    Electronic Resource
    Electronic Resource
    Sterically stressed amino- and PH-functional di-t-butyl-o-phosphinophenols - Intramolecular interaction and formation of benzoxadiphospholes (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 9 (1998), S. 183-193 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Lithium and sodium o-lithio-4,6-di-t-butyl-phenolates 1 and 2 react, successively, with ClP(NMe2)2 and ClSiMe3 to give 2-(Me2N)2P-4,6-t-Bu2C6H2OSiMe3 3. 1 and ClP(NMe2)Ph furnish a small amount of the analogous compound 4 but mainly diastereoisomers of a C, O-diphosphinylation product 5A/B, which exhibit large through-space coupling constants (4JPP = 152 and 237.5 Hz). Under certain conditions, the P-N bond is attacked, and triphosphines 6 and 7 are formed. Alcoholysis of 3-5 and subsequent reduction with LiAlH4 yields the respective bulky primary and secondary phosphinophenols 8 and 9. Both decompose partially on distillation, affording tBu2C6H3OH and the cyclic diphosphines 10 and 11. 10, a further dihydro-benzoxadiphosphol 13 and a phosphinidene-phosphorane 14 are formed by reaction of 8 with P(NMe2)3. The molecular structure of bicyclic 10, folded at the P-P bond, is reported. The uncommon features - unselective disubstitution of 1, P…P interactions in 5 and 6, facile P-C cleavage of 8 and 9, and diphosphine formation - reveal a dramatic influence of the bulky substituents in the 6-position on the chemistry of 2-phosphinophenols. © 1998 John Wiley & Sons, Inc. Heteroatom Chem 9:183-193, 1998
    Additional Material: 1 Ill.
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  • 7
    Electronic Resource
    Electronic Resource
    Unusual formation of a λ 6P-tetrafluorophosphate involving intramolecular donor-acceptor interaction; x-ray crystal structure analysis and temperature-dependent NMR-spectra (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 2 (1991), S. 81-86 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The N,N,N′-trimethylethylenediaminetetrafluorophosphate, 4, was formed in the unusual reaction of N,N,N′-trimethyl-N′-trimethylsilylethylenediamine, 1, with the N—P-bonded tetrafluorophosphoranes, dimethylaminotetrafluorophosphorane, 2, or morpholinotetrafluorophosphorane, 3. There was no evidence for the cleavage of a P—F bond in the tetrafluorophosphoranes (with formation of Me3SiF); instead, the Si—N compounds, R2N—SiMe3 (R2 = Me2 or O(CH2CH2)2) were formed. The 19F and 31P NMR spectra of 4 at room temperature indicated dynamic behavior. The X-ray crystal structure analysis of 4 revealed the presence of a five-membered ring, formally as a result of intramolecular donor-acceptor interaction (P—N = 196.5 pm) between the nitrogen atom of the Me2N group and phosphorus.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520020111
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  • 8
    Electronic Resource
    Electronic Resource
    A 1,5-diaza-2,4-(λ4P+, λ6P-)-diphosphorinaneDedicated to Professor Academician Alexander V. Kirsanov on the occasion of his 90th birthday. (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 3 (1992), S. 177-180 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The oxidation of the 1,3-diaza-4,6-diphosphorine 1 with tetrachloroorthobenzoquinone 2 led, unexpectedly, to the formation of 1,5-dimethyl-2,2-bis(dimethyl-amino)-4,4,4,4-bis-(tetrachloro-o-phenylenedioxa)-1,5-diaza-2,4-λ4, λ6-diphosphorinane-6-one 4, containing two phosphorus atoms of opposite formal charge and different coordination number. The X-ray crystal structure analysis of 4 revealed the presence of a six-membered ring with an unusual conformation.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/hc.520030214
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  • 9
    Electronic Resource
    Electronic Resource
    Synthesis of dimethyl 4-thiazolidinylphosphine oxides via addition of dimethylphosphine oxide to 3-thiazolines (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 8 (1997), S. 207-215 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The addition of dimethylphosphine oxide and its trimethylsiloxyphosphorus(III) derivative, generated in situ, to 3-thiazolines was found to yield dimethyl 4-thiazolidinylphosphine oxides via three different synthetic routes. The structures of two products were confirmed by X-ray analysis; common features include approximate envelope conformations of the five-membered rings and hydrogen bonding of the form N-H· · ·O=P. © 1997 John Wiley & Sons, Inc. Heteroatom Chem 8: 207-215, 1997.
    Additional Material: 5 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    2-phosphaindolizines (1998)
    New York, NY [u.a.] : Wiley-Blackwell
    Heteroatom Chemistry 9 (1998), S. 333-339 
    Details
    ISSN: 1042-7163
    Keywords: Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Eight new 2-phosphaindolizines 2 have been obtained by [4 + 1] cyclocondensation of 1,2-dialkylpyridinium halides 1 with PCl3. The X-ray structure analysis of 2a is consistent with the integration of the 1,3-azaphosphole ring in the 10π-aromatic system. The charge densities on phosphorus of various representatives as obtained by PM3 calculations correlate approximately with the 31P-NMR shifts. The mass spectral fragmentation of 2a resembles that of its nonphosphorus analog. © 1998 John Wiley & Sons, Inc. Heteroatom Chem 9:333-339, 1998
    Additional Material: 1 Ill.
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