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
URL:
http://dx.doi.org/10.1002/zaac.19804650108
