ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

feed icon rss

Your email was sent successfully. Check your inbox.

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

Proceed reservation?

Export
Filter
  • 1980-1984  (8)
Collection
Publisher
Years
Year
  • 1
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 2
    ISSN: 0570-0833
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 3
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 4
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Structures of the Heptahetero-Nortricyclene-chromiumcarbonyl Complexes P4(Sime2)3Cr(CO)5 and [P4(Sime2)3Cr(CO)4]2Hexamethyl-trisila-tetraphospha-norticyclene-chromium-pentacarbonyl P4(Sime2)3Cr(CO)5 1 and Bis-hexamethyl-trisila-tetraphospha-nortricyclene-chromiumtetracarbonyl [P4(Sime2)3Cr(CO)4]2 2 are nortricyclene complexes with P atoms of the P3 ring acting as donor atoms. The crystal and molecular structures were determined by single crystals (1; space group P1 (No.2); a = 992.4 pm, b = 1301.7 pm, c = 895.7 pm, α = 91.15°, β = 105.650, γ = 98.74°, Z = 2; MoKα radiation, 3978 hkl, R = 0.032; 2; space group Pbca (No. 61); a = q715.6 pm, b = 4003.4 pm, c = 1254,8 pm, Z = 8; MoKα radiation, 3745 hkl, R = 0.070). The bond distances P —Cr are 240.3 pm and 238.1 pm, respectively. The bonding of the chromiumcarbonylgroups to the P3 ring leads only to small changes of the bond distances (1-2 pm) in the nortricyclene system. The bond angles around the donor atom change cooperatively to a more tetrahedral configuration at the donor atom. These changes are discussed in detail.
    Notes: Hexamethyl-trisila-tetraphospha-Nortricyclen-chrompentacarbonyl P4(Sime2)3Cr(CO)5 1 und Bis-hexamethyl-trisila-tetraphospha-Nortricyclen-chromtetracarbonyl [P4(Sime2)3Cr(CO)4]2 2 sind Nortricyclen-Komplexe mit Phosphoratomen des 3-Rings als Donatoren. Die Kristall- und Molekülstrukturen wurden an Einkristallen bestimmt (1; Raumgruppe P1 (Nr. 2); a = 992.4 pm; b = 1301,7 pm; c = 895,7 pm; α = 91,15°; β = 105,65°; γ = 98,74°; Z = 2; MoKαStrahlung; 3978 hkl; R = 0,032. 2; Raumgruppe Pbca (Nr.61); a = 1715,6 pm; b = 4003,4 pm; c = 1254,8 pm; Z = 8; MoKαStrahlung; 3745 hkl; R = 0,070). Die Abstände P—Cr betragen 240,3 pm bzw. 238,1 pm. Die Bindung von Chromcarbonylgruppen an den P3-Ring führt zu geringfügigen Veränderungen bei den Bindungsabständen (1-2 pm) des Nortricyclensystems. Die Bindungswinkel im weiteren Bereich der Donoratome ändern sich jedoch deutlich kooperativ im sinne der Ausbildung einer Tetraederkonfiguration am Donor. Die Veränderungen werden eingehend diskutiert.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 5
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Properties and Crystal Structures of Reduced Gallium Halides: Ga2I4 and Ga2I3The compounds Ga2I4 and Ga2I3 were prepared as small single crystals by heating the elements in sealed glass ampoules. Thermal behaviour, IR and Raman spectra as well as the crystal structures were investigated. Due to our investigations Ga2I3 is the most metal-rich gallium iodide. According to X-ray results it is identical with the formerly described „GaI“. - The crystal structures of the compounds Ga2I4 and Ga2I3 were solved on the basis of diffractometer data: Ga2I4 forms rhombohedral crystals, space group R3c; a = 2 521.5(2) and c = 783.9(1) pm. The structure corresponds to the expected formula Ga+(GaI4)-. Tube-like arrangements of the GaI4 tetrahedra are the remarkable structural feature. These are bonded to one another by van der Waals forces and contain the Ga+ ions inside. This arrangement results from a (radial) close-packing of the I atoms of the GaI4- anions. Interstitials in this arrangement are occupied by Ga+-ions and modified in a way to show the influence of the non-bonding electron pair of the Ga+ ion. - Ga2I3 crystallizes in the monoclinic space group P21/c (a = 1 129.4(3); b = 871.5(1); c = 1 345.3(4) pm; β = 145.6(1)°) according to the formula (Ga+)2(Ga2I6)2-. The anion is isoelectronic (and isostructural) with Si2I6 and occurs in the staggered conformation. The Ga-Ga-distance is 238.7(5) pm. The coordination around Ga+ is very similar to that in Ga2I4.
    Notes: Die Verbindungen Ga2I4 und Ga2I3 wurden durch Reaktionen der Elemente in verschmolzenen Glasampullen in Form kleiner Einkristalle dargestellt. Thermische Eigenschaften, schwingungsspektroskopisches Verhalten und Strukturen wurden untersucht. Insbesondere wurde sichergestellt, daß Ga2I3 das metallreichste Galliumiodid im System Ga/I2 ist; Ga2I3 ist mit dem früher beschriebenen „GaI“ identisch. Ga2I4 kristallisiert rhomboedrisch in der Raumgruppe R3c mit a = 2521,5(2) und c = 783,9(1) pm. Der Aufbau entspricht erwartungsgemäß der Formel Ga+(GaI4)-. Auffallendes Strukturmerkmal sind röhrenförmige Anordnungen der GaI4-Tetraeder, die über van-der-Waals-Bindungen mit benachbarten Röhren zusammenhängen und die Ga+-Ionen im Inneren enthalten. Dieser Aufbau resultiert aus einer innerhalb der Röhren dichtesten Anordnung der I-Atome der GaI4-Anionen. Die Lücken dieser Anordnung sind durch Ga+-Ionen besetzt und lassen den Einfluß des nichtbindenden Elektronenpaars am Ga+-Ion erkennen. - Ga2I3 kristallisiert monoklin in der Raumgruppe P21/c mit a = 1 129,4(3); b = 871,5(1), c = 1 345,3(4) pm; β = 145,6(1)° und ist als (Ga+)2(Ga2I6)2- zu formulieren. Das mit Si2I6 isoelektronische (und isostrukturelle) Anion liegt in der gestaffelten Konformation vor; der Ga-Ga-Abstand beträgt 238,7(5) pm. Die Koordination von Ga+ entspricht weitgehend der in Ga2I4.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 6
    ISSN: 0044-2313
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Nb2Y2X6, ein neuer Typ von NbIV-Verbindungen mit gekreuzt verbundenen Nb2-und Y2-Hanteln (Y = Se, Te; X = Br, I)Die Verbindungen Nb2Se2Br6, Nb2Te2Br6 und Nb2Te2I6 wurden aus den Elementen in geschlossenen Quarzampullen bei 1073 K hergestellt. Die kristallinen Substanzen haben metallischen Glanz und sind unempfindlich gegen Feuchtigkeit und Sauerstoff. Alle Verbindungen zeigen mehrere reversible thermische Übergänge (DTA). Neben binären Halogeniden liegt in der Gasphase nur NbYX3 vor. Die Strukturen bestehen aus eindimensional unendlichen Ketten Halogen-verbrückter Nb2(Y2)X4, die einen quasitetraedrischen Nb2Y2-Cluster aus «side-on» gebundenen Nb2- und Y2-Hanteln enthalten (Nb—Nb = 283,2; 287,5; 293,2 pm; Se—Se = 230,5 pm; Te—Te = 267,0; 268,5 pm). Die strukturellen und magnetischen Eigenschaften belegen klar  -  unerwartet aus der Stöchiometrie  -  die formalen Oxydationsstufen Nb4+ und Y1-. Strukturdaten s. Abstract.
    Notes: The compounds Nb2Se2Br6, Nb2Te2Br6, and Nb2Te2I6 were prepared from the elements in sealed quartz ampoulès at 1073 K. The crystalline solids, exhibiting a metallic lustre, are insensitive against moisture and oxygen. All compounds undergo several reversible thermal transitions with temperature (DTA). Beside binary halides only NbYX3 is present in the gas phase. The structures consist of one-dimensional infinite chains of halogen bridged Nb2(Y2)X4 units containing single side-on bonded Nb2 and Y2 dumbbells forming a quasi tetrahedral Nb2Y2 cluster (Nb—Nb = 283.2; 287.5; 293.2 pm; Se—Se = 230.5 pm; Te—Te = 267.0; 268.5 pm). The structural and magnetic properties clearly prove the formal oxidation states Nb4+ and Y1-, unexpected from stoichiometry. (Structural data: all P2/a (No. 13); Nb2Se2Br6: a = 1254.0(12); b = 689.7(10); c = 662.4(10) pm; β = 98.9(1)°; Z = 2; 1274 hkl; R = 0.066. Nb2Te2Br6: a = 1259.7(13); b = 713.5(9); c = 667.0(9) pm; β = 97.6(1)°; 1557 hkl; R = 0.043. Nb2Te2I6: a = 1347.3(3); b = 742.9(2); c = 714.1(2) pm; β = 98.52(2)°; 1540 hkl; R = 0.026).
    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: Structures of the l,3,5-Trisilacyclohexane-Iron Dicarbonyl-cyclopentadienyl Complexes and C3H6Si3Cl5Fe(CO)2πcp and C3H6Si3Cl4(Fe(CO2)πcp)2Trisilapentachlorocyclo-hexyl-dicarbonylcyclopentadienyliron C3H6Si3Cl5Fe(CO)2πcp 1 and Trisilatetrachlorocyclohexyl-bis(dicarboncyclopentadienyliron)C3H6Si3Cl4(Fe(CO)2πcp)2 2 are 1,3,5-Trisilacyclohexane complexes substituted by dicarbonylcyclopentadienyliron at one and two silicon atoms of the six-membered ring, respectively. The crystal and molecular structures were determined from single crystals (1; space group P21/a (No. 14); a = 1100.5 pm; b = 2033.9 pm; c = 843.3pm; β = 98.58°; Z = 4; MoKα-radiation; 3142h k l; R = 0.036. 2; space group P1; (No. 2); a = 1231.1 pm; b = 1267.3 pm; c = 1045.9 pm; α = 113.23°; β = 83.93°; γ = 115.00°; Z = 2; Mokα-radiation; 4196 h k 1; R = 0.065). In both complexes the six-membered rings of the carbosilane ligands are in skew-boat conformation. The bond lengths Fe—Si are 226.4 pm and 228.1 pm, respectively. The distances Si—C and Si—Cl are 186 pm and 206 pm in 1 and 187 pm and 209 pm in 2. Their different lengths depend on the position in the ligand system and can be explained with the concept of bond orders.
    Notes: Trisilapentachlorocyclohexyl-dicarbonylcyclopentadienyleisen C3H6Si3Cl5Fe(CO)2πcp 1 und Trisilatetrachlorocyclohexyl-bis(dicarbonylcyclopentadienyleisen) C3H6Si3Cl4(Fe(CO)2πcp)2 2 sind 1,3,5-Trisilacyclohexan-Komplexe mit Dicarbonylcyclopentadienyleisen als Substituenten an einem bzw. zwei Si-Atomen des Sechsrings. Die Kristall- und Molekülstrukturen wurden an Einkristallen bestimmt (1; Raumgruppe P21/a (Nr. 14); a = 1100,5 pm; b = 2033,9 pm; c = 843,3 pm; β = 98,58°; Z = 4; MoKα-Strahlung; 3142 h k l; R = 0,036. 2; Raumgruppe P1 (Nr. 2); a = 1231,1 pm; b = 1267,3 pm; c = 1045,9pm; α = 113,23°;β = 83,93°; γ = 115,00°; Z = 2; MoKα-Strahlung; 4196 h k l; R = 0,065). In beiden Komplexen liegen die Sechsringe der Carbosilanliganden in der Konformation von Twistwannen vor. Die Bindungsabstände Fe—Si betragen 226,4 pm in 1 bzw. 228,1 pm in 2. Die Abstände Si—C und Si—Cl liegen bei 186 pm und 206pm in 1 bzw. 187 pm und 209 pm in 2. Sie hängen von der Position im Ligandensystem ab. Die unterschiedlichen Bindungslängen können mit dem Konzept der Bindungsordnungen erklärt werden.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
  • 8
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 1 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...