ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

Your search history is empty.
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    ISSN: 1434-4475
    Keywords: Coordination of As(III) ; Structure ; Stereoisomeres
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Arsenictris(trifluoroacetate) (1) crystallizes monoclinic in the space group Cc witha=1229.3,b=1697.9,c=1243.5 pm, β=110.01°, andZ=8. The trifluoroacetic acid ions acts as chelating ligands. Additionally they are bridging crystallographic independent molecules. As has a coordination number of 3+3(+2). The unit cell contains two sets of chirameres.
    Notes: Zusammenfassung Arsen-tris(trifluoracetat) (1) kristallisiert monoklin in der Raumgruppe Cc mita=1229.3,b=1697.9,c=1243.5 pm, β=110.01° undZ=8. Die Trifluoracetatanionen fungieren gegenüber As als zweizähnige Liganden und verknüpfen die beiden kristallographisch unabhängigen Moleküle zusätzlich intermolekular. As erreicht dadurch gegenüber O die Koordinationszahl 3+3(+2). Die Elementarzelle enthält zwei Sätze von chirameren Molekülen.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Monatshefte für Chemie 127 (1996), S. 461-468 
    ISSN: 1434-4475
    Keywords: Coordination of As(III) and Sb(III) ; Structure ; Enantiomers
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Summary Arsen-tris(2,2-dimethylpropionate) (1) crystallizes monoclinic in the space group P21/n witha=926.2,b=2158.6,c=983.7 pm, β=94.92°, andZ=4. As has a coordination number of 3+3. Antimony tripropionate (2) crystallizes monoclinic in the space group P21/c witha=930.2,b=863.0,c=1575.2 pm, β=90.27, andZ=4. The molecules are bridged to chains; therefore, Sb reaches the coordination number 3+3 (+3).
    Notes: Zusammenfassung Arsen-tris(2,2-dimethylpropionat) (1) kristallisiert monoklin in der Raumgruppe P21/n mita=926.2,b=2158.6,c=983.7 pm, β=94.92° undZ=4. As hat gegenüber O die Koordinationszahl 3+3. Antimontripropionat (2) kristallisiert monoklin in der Raumgruppe P21/c mita=930.2,b=863.0,c=1575.2 pm, β=90.27 undZ=4. Die Moleküle sind intermolekular zu Ketten verknüpft, wodurch Sb die Koordinationszahl 3+3 (+3) erreicht.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0044-2313
    Keywords: Lithium [tris(trimethylsilyl)silyl]tellanide · DME ; covalent radius of DME complexed Li ; [tris(trimethylsilyl)silyl]tellane ; methyl-[tris(trimethylsilyl)silyl]tellane ; bis[tris(trimethylsilyl)silyl]ditellane ; Te—H bond ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Derivatives of Molecular Compounds. IV Synthesis, Structure, and Reactivity of Lithium [Tris(trimethylsilyl)silyl]tellanide · DMELithium tris(trimethylsilyl)silanide · 1,5 DME [3] and tellurium react in 1,2-dimethoxyethane to give colourless lithium [tris(trimethylsilyl)silyl]tellanide · DME (1). An X-ray structure determination {-150 · 3·C; P21/c; a = 1346.6(4); b = 1497.0(4); c = 1274.5(3) pm; β = 99.22(2)·; Z = 2 dimers; R = 0.030} shows the compound to be dimeric forming a planar Li—Te—Li—Te ring with two tris(trimethylsilyl)silyl substituents in a trans position. Three-coordinate tellurium is bound to the central silicon of the tris(trimethylsilyl)silyl group and to two lithium atoms; the two remaining sites of each four-coordinate lithium are occupied by the chelate ligand DME {Li—Te 278 and 284; Si—Te 250; Li—O 200 pm (2X); Te—Li—Te 105°; Li—Te—Li 75°; O—Li—O 84°}. The covalent radius of 154 pm as determined for the DME-complexed lithium in tellanide 1 is within the range of 155 ± 3 pm, also characteristic for similar compounds. In typical reactions of the tellanide 1 [tris(trimethylsilyl)silyl]tellane (2), methyl-[tris(trimethylsilyl)silyl]tellane (4) and bis[tris(trimethylsilyl)silyl]ditellane (5) are formed.
    Notes: Lithium-tris(trimethylsilyl)silanid · 1,5 DME [3] reagiert mit Tellur in 1,2-Dimethoxyethan zu farblosem Lithium-[tris(trimethylsilyl)silyi]tellanid · DME (1). Nach der Röntgenstrukturanalyse {-150 ± 3°C; P21/c; a = 1346,6(4); b = 1497,0(4); c = 1274,5(3) pm; β = 99,22(2)°; Z = 2 Dimere; R = 0,030} ist Verbindung 1 im Festkörper dimer; die beiden Tris(trimethylsilyl)silyl-Gruppen sind am planaren Li—Te—Li—Te-Ring trans-ständig zueinander angeordnet. Tellur erreicht durch Bindung an zwei Lithium und ein Silicium die Koordinationszahl 3, Lithium durch Bindung an zwei Tellur und den Chelatliganden DME die Koordinationszahl 4 {Li—Te 278 und 284; Si—Te 250; Li—O 200 pm (2X); Te—Li—Te 105°, Li—Te—Li 75°; O—Li—O 84°}. Der hier zu 154 pm ermittelte kovalente Radius des DME-komplexierten Lithiumatoms fällt in den auch für andere Verbindungen typischen Bereich von 155 ± 3 pm. Charakteristische Umsetzungen des Tellanids 1 führen zu [Tris(trimethylsilyl)silyl]tellan (2), Methyl-[tris(trimethylsilyl)silyl]tellan (4) und Bis[tris(trimethylsilyl)silyl]ditellan (5).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0044-2313
    Keywords: Binuclear antimony(V) complexes ; structure ; dynamics ; NMR spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: d, h-μ-Benzylalkoxophosphonato-e-μ-alkoxo-f-μ-oxo-bis[trichloroantimony(V)] CompoundsThe binuclear antimony(V) complexes Cl3Sb(O)[R3(R1O)PO2](OR2)SbCl3 1 - 6 with R1 = R2 = CH3, C2H5 and R3 = C6H5CH2, (CH3)3C6H2CH2 in solution slowly exchanges the R2 groups between the oxygen atoms of the Sb2O2 ring. The SbOPOSb ringsystem makes rapid pseudorotation. The isomeres are detected by nmr spectroscopy. 1 (R1 = R2 = CH3) crystallizes in the orthorhombic space group Pnma with a = 1247.0, b = 1324.1, c = 1207.9 pm and Z = 4. 2 (R1 = CH3, R2 = C2H5) and 5 (R1 = R2 = CH3, R3 = (CH3)3 · C6H2CH2) crystallizes triclinic in the space group P-1 with a = 984.1, b = 1026.7, c = 1079.9 pm, α = 87.93, β = 75.70, γ = 87.62° and Z = 2 and a = 1164.6, b = 1296.9, c = 1712.9 pm, α = 109.9, β = 96.3, γ = 100.2° and Z = 4 resp., with two crystallographically independent molecules in the asymmetric unit.
    Notes: Die zweikernigen Antimon(V)-Komplexe Cl3Sb(O)[R3(R1O)PO2](OR2)SbCl3 1 bis 6 mit R1 = R2 = CH3, C2H5 und R3 = C6H5CH2, (CH3)3C6H2CH2 tauschen bei RT in Lösung langsam die R2-Gruppen aus. Daneben erfolgt rasches Umklappen des SbOPOSb-quasi-Fünfringes. Die Isomerenbildung wird NMR-spektroskopisch nachgewiesen. 1 (R1 = R2 = CH3) kristallisiert orthorhombisch in der Raumgruppe Pnma mit a = 1247,0, b = 1324,1, c = 1207,9 pm und Z = 4. 2 (R1 = CH3, R2 = C2H5) und 5 (R1 = R2 = CH3, R3 = (CH3)3C6H2CH2) kristallisieren triklin in der Raumgruppe P-1 mit a = 984,1, b = 1026,7, c = 1079,9 pm, α = 87,93, β = 75,70, γ = 87,62° und Z = 2 bzw. a = 1164,6, b = 1296,9, c = 1712,9 pm, α = 109,9, β = 96,3, γ = 100,2° und Z = 4 mit zwei kristallographisch unabhängigen Molekülen in der asymmetrischen Einheit.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0044-2313
    Keywords: Sulfoximide ; Sulfoximidium Salts ; Structure ; Hydrogenbonding ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Sulfoximide and Sulfoximidium Salts - Structures and Hydrogen BondingIn the solid state dimethylsulfoximide (1) (orthorhombic; space group Pbca; a = 577.8, b = 931.2 and c = 1645.6 pm) makes intermolecular N—H ≡ N hydrogen bonds. The hydrogen halide salts (CH3)2S(O)NH2+Hal- ((2), Hal-=Cl-; (4), Hal-=Br-) reacts with metal halides to yield (CH3)2S(O)NH2+MHalyn- with the complex anions ((5), MHalyn-=SbCl4-; (6), MHalyn-=SbCl52-; (7), MHalyn-=SbCl6-; (8), MHalyn-=SbBr52-; (9), MHalyn-=AlCl4-). 2 crystallizes from ethanol (96%) as [(CH3)2S(O)NH2+Cl-]2 · H2O (3). The structures of 3 (monoclinic; space group P21/c; a = 917.0, b = 1344.7, c = 1080.8 pm and β = 103.8°; Z = 10), 4 (orthorhombic; space group Pbcn; a = 1028.9, b = 1132.6, c = 1074.1 pm; Z = 8) and 6 (monoclinic; space group C2/c; a = 2041.1, b = 1101.4, c = 3365.6 pm and β = 153.8°; Z = 8) are determined by X-ray analysis. In 6 Sb is coordinated in a distorted octahedra by 6 Cl in three short (mean 245,5 pm; SbCl3) and three long distances (291 to 299 pm; Cl-). Two of the chloride ions connect the Sb atoms to infinite Sb … Cl … Sb chains. Except for 7 and 9 there are bridges between the NH2 groups and the halide ions. The NH valence vibrations are discussed in view of hydrogen bonding.
    Notes: Im festen Dimethylsulfoximid (1) (orthorhombisch; Raumgruppe Pbca; a = 577,8, b = 931,2 und c = 1645,6 pm) sind zwischen den Imidgruppen N—H … N-Brückenbindungen ausgebildet. Die mit HHal darstellbaren Salze (CH3)2S(O)NH2+Hal- ((2), Hal-=Cl-; (4), Hal-=Br-) reagieren mit MHalx zu (CH3)2S(O)NH2+MHalyn- ((5), MHalyn-=SbCl4-; (6), MHalyn-=SbCl52-; (7), MHalyn-=SbCl6-; (8), MHalyn-=SbBr52-; (9), MHalyn-=AlCl4-). 2 kristallisiert aus 96% Ethanol als [(CH3)2S(O)NH2+Cl-]2 · H2O (3). Die Strukturen von 3 (monoklin; Raumgruppe P21/c; a = 917,0, b = 1344,7, c = 1080,8 pm und β = 103,8°; Z = 10), 4 (orthorhombisch; Raumgruppe Pbcn; a = 1028,9, b = 1132,6, c = 1074,1 pm; Z = 8) und 6 (monoklin; Raumgruppe C2/c; a = 2041,1, b = 1101,4, c = 3365.6 pm und β = 153,8°; Z = 8) wurden bestimmt. In 6 ist Sb verzerrt oktaedrisch von 6 Cl in drei kurzen (im Mittel 245,5 pm; SbCl3) und drei langen Abständen (291 bis 299 pm; Cl-) umgeben. Zwei der lang gebundenen Cl-Ionen verknüpfen die Sb-Atome zu unendlichen Sb … Cl … Sb-Ketten. Die NH2-Gruppen der Kationen bilden außer in 7 und in 9 H—Brückenbindungen zu den Halogenidionen. Die NH-Valenzschwingungen werden im Hinblick auf die Wasserstoffbrückenbindungen diskutiert.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 623 (1997), S. 1633-1638 
    ISSN: 0044-2313
    Keywords: (CH3)2S derivatives ; Structure ; Spectra ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: (CH3)2SBr2 - Reactions and Structures(CH3)2SBr2 (1) is a donor acceptor complex (8-S-3 + 10-Br-2) which reacts with (CH3)2S(=O)NSi(CH3)3 to yield [(CH3)2S(O)=N—S(CH3)2]+Br- (2). With SbBr3 (CH3)2SBr+SbBr4- (3) can be isolated. 1 crystallizes monoclinic in the space group P21/c with a = 733.8, b = 734.2, c = 1132.7 pm, β = 92.8° and Z = 4. 2 crystallizes in the orthorhombic space group Pnma with a = 967.2, b = 793.3, c = 1168.3 pm and Z = 4. The SBr and BrBr force constants of 1 are compared with those of S2Br2, 3 and Br2 resp. The nmr and mass spectra of 1 and 2 are communicated.
    Notes: (CH3)2SBr2 (1) ist ein (8-S-3 + 10-Br-2) Donor-Akzeptor-Komplex(8-S-3 + 10-Br-2) bedeutet: acht Valenzelektronen am S-Atom, das von drei Bindungspartnern umgeben ist, und zehn Valenzelektronen am Br-Atom, das zwei Bindungspartner hat; s.: S. W. Perkins, J. C. Martin, A. J. Arduengeo III, W. Lau, A. Alegria, J. K. Kochi, J. Am. Chem. Soc. 1980, 102, 7753. und reagiert mit (CH3)2S(=O)NSi(CH3)3 zu [(CH3)2S(O)=N—S(CH3)2]+Br- (2), mit SbBr3 zu (CH3)2SBr+SbBr4- (3). 1 kristallisiert monoklin (P21/c) mit a = 733,8, b = 734,2, c = 1132,7 pm, β = 92,8° und Z = 4. 2 kristallisiert orthorhombisch in der Raumgruppe Pnma mit a = 967,2, b = 793,3, c = 1168,3 pm und Z = 4. Die SBr- und BrBr-Kraftkonstanten von 1 werden mit denen von S2Br2 und 3 bzw. Br2 verglichen. Die NMR- und Massenspektren von 1 und 2 werden kurz diskutiert.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 7
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Metal Derivatives of Molecular Compounds. V. Synthesis and Structure of Hexakis{lithium-[tris(trimethylsilyl)silyl]tellanide} - Cyclopentane (1/1).Lithium [tris(trimethylsilyl)silyl]tellanide - DME (1/1) [1 b] prepared from lithium tris(trimethylsilyl)silanide - DME (2/3) [3] and tellurium, reacts with hydrogen chloride in toluene to form [tris(trimethylsilyl)silyl]tellane (1) [1 b]. Subsequent metalation of this compound with lithium n-butanide gives lithium [tris(trimethylsilyl)silyl]tellanide (2) free of coordinating solvent. Pale yellow crystals are obtained from cyclopentane solution. An X-ray structure determination {P1; a = 1 558.5(7); b = 1 598.4(8); c = 1 643.5(6) pm; α = 117.64(4); β = 91.63(3); γ = 117.19(3)°; Z = 1; R = 0.032} shows them to be the (1/1) packing complex (2′) of hexakis{lithium-[tris(trimethylsilyl)silyl]tellanide} and disordered cyclopentane molecules  - {Li—Te—Si[Si(CH3)3]3}6 · C5H10.
    Notes: Das aus Lithium-tris(trimethylsilyl)silanid - DME (2/3)1,2-Dimethoxyethan (DME); 1,4,7-Trimethyl-1,4,7-triaza-cyclo-nonan (TACN); Bis[2-(dimethylamino)ethyl]-methylamin (PMDTA); Tetrahydrofuran (THF); 1,4,7,10-Tetraoxa-cyclo-dodecan ([12]Krone-4); 2,4,6-Trimethylphenyl (Mes); 1,2-Bis(dimethylamino)ethan (TMEDA); Tetramethylsilan (TMS); Octamethyl-cyclo-tetrasiloxan (OMCT); Lösungsmittel (L.M.). [3] und Tellur leicht zugängliche, farblose dimere Lithium-[tris(trimethylsilyl)silyl]tellanid - DME (1/1) [1 b] reagiert mit Chlorwasserstoff in Toluol zu [Tris(trimethylsilyl)silyl]tellan (1); hieraus erhält man mit Lithium-n-butanid donorsolvens-freies Lithium-[tris(trimethylsilyl)silyl]tellanid (2). Wie eine Röntgenstrukturanalyse an den blaßgelben, aus Cyclopentan-Lösung isolierten Kristallen {P1; a = 1 558,5(7); b = 1 598,4(8); c = 1 643,5(6) pm; α = 117,64(4); β = 91,63(3); γ = 117,19(3)°; Z = 1; R = 0,032} zeigt, liegt Verbindung 2 im Festkörper hexamer vor; mit den in Hohlräumen der Struktur eingeschlossenen, fehlgeordneten Cyclopentan-Molekülen entsteht ein 1/1-Packungskomplex [11] der Zusammensetzung {Li—Te—Si[Si(CH3)3]3}6 · C5H10 (2′).Das Hexamer weist zwei aus Lithium- und tris(trimethylsilyl)silyl-substituierten Telluratomen in alternierender Abfolge aufgebaute, schwach gewellte sechsgliedrige Ringe mit Sesselkonformation auf, die über ein Inversionszentrum zu einem verzerrt hexagonalen Prisma verknüpft sind. Die endocyclischen Winkel in den sechs- und viergliedrigen Ringen dieses Polyeders variieren zwischen 102 und 126° bzw. 73 und 83° am vierfach koordinierten Tellur sowie zwischen 112 und 137° bzw. 96 und 106° am dreifach koordinierten Lithium. Einen signifikanten Unterschied beobachtet man auch zwischen den zu 273 bzw. 280 pm gemittelten basalen und axialen Li—Te-Abständen.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 9
    ISSN: 0044-2313
    Keywords: Tris(trimethylsilyl)methyl-derivatives, Lithium, Aluminium, Gallium, Indium ; spectra ; X-ray Structures ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Base-free Tris(trimethylsilyl)methyl Derivatives of Lithium, Aluminium, Gallium, and IndiumBase-free LiR* (R*=-C(SiMe3)3) has been prepared from R*Cl and Li-metal in toluene at 85-90°C and used to synthesize the metallanes R*MMe2 with M = Al, Ga and In, respectively. The NMR (1H, 13C, 29Si) and the vibrational spectra of these trisyl compounds have been discussed.AlCl3 and LiR*(ratio 1 : 1) forms the metallate metallate Li[R*AlCl3]. The triclinic unit cell (space group P1) consists of a centrosymmetric assoziate, formed by four Li[R*AlCl3]- units with Al—Cl…Li bridges, two pairs of Li-atoms differing in their chlorine-coordination and two disordered toluene molecules, inserted in the crystal lattice (R1wR2 =0,0444/0,1072).The reaction of GaCl3 with LiR* (I :1) gives the unusual sesquichloride (R*Ga(Cl1,33)Me0,67)3 in moderate yield. The X-ray structure determination shows a Ga3Cl3-skeleton with chairconformation and disordered, terminal gallium ligands (R1/wR2= 0,0646/0,2270).
    Notes: Basefreies LiR* (R*=-C(SiMe3)3) wurde aus R*Cl und Lithiummetall in Toluol bei 85-90°C erhalten und zur Darstellung der Dimethylmetallane R*MMe2 mit M = Al, Ga, In verwendet, die durch NMR- (1H, 13C, 29Si) und Schwingungsspektren (Raman, IR) charakterisiert werden.AlCl3 und LiR* (Molverhältnis 1 : 1) bilden das Metallat Li[R*AlCl3]. Die trikline Einheitszelle (Raumgruppe P1) enthält ein zentrosymmetrisches, über Al—Cl … Li—Brücken gebildetes Assoziat aus vier Li[R*AlCl3]-Einheiten, mit zwei paarweise unterschiedlich von Chlor koordinierten Li-Atomen sowie zwei fehlgeordnete Toluolmoleküle (R1/ wR2 = 0,0444/0,1072).Die Reaktion von GaCl3 mit LiR* (1 : 1) in Toluol führt in mäßiger Ausbeute zum ungewöhnlichen Sesquichlorid (R*Ga(Cl1,33)Me0,67)3. Die Röntgenstrukturanalyse zeigt ein sesselförmig gewelltes Ga3Cl3-Sechsringgerüst und fehlgeordnete, terminale Liganden am Galliumatom (R1/ wR2 = 0,0646/0,2270).Li[R*AlCl3]. The triclinic unit cell (space group P1) consists of a centrosymmetric assoziate, formed by four Li[R*AlCl3]-units with Al-Cl … Li bridges, two pairs of Li-atoms differing in their chlorine-coordination and two disordered toluene molecules, inserted in the crystal lattice (R1/wR2 = 0,0444/0,1072).The reaction of GaCl3 with LiR* (1 : 1) gives the unusual sesquichloride (R*Ga(Cl1,33)Me0,67)3 in moderate yield. The X-ray structure determination shows a Ga3Cl3-skeleton with chairconformation and disordered, terminal gallium ligands (R1/wR2 = 0,0646/0,2270).
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...