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Komplexe des zweiwertigen Molybdäns, Derivate des Oktahalodimolybdat(II)-Ions, 4. Mitt.: Darstellungen und Kristallstrukturen von zwei neutralen Komplexen mit 4-Methylpyridin

Coordination compounds of molybdenum(II), derivatives of the octahalodimolybdate(II) ion. IV. Synthesis and crystal structures of two neutral compounds with 4-methylpyridine

  • Anorganische, Struktur- und Physikalische Chemie
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Abstract

Mo2Cl4 Pic 4·CHCl3 (A) (Pic=4-methylpyridine) and Mo2Br4 Pic 4 (B) crystallize in the monoclinic space group.A inC2/c (No. 15) witha=15.175 (4),b=10.847 (2),c=19.946 (6) Å and β=104.52 (2)°;D o=1.71 (2),D c =1.72 gcm−3 forZ=4.B inP2l/n (No. 14) witha=9.270 (3),b=16.614 (5),c=9.305 (3) Å and β=91.96 (5)°;D o=2.03 (3),D c =2.05 gcm−3 forZ=2.

Two halogens and 4-methylpyridines of the MoX 2 Pic 2 group are in the trans position. Mo−Mo bond lengths are 2.153 96) forA and 2.150 92) Å forB. Both molecules are situated on the inversion center resulting in the eclipsed configuration of the ligands around the molybdenum pair. The structure ofB has been refined to the conventionalR factors of 0.08 and 0.098. Disorder on the part of 4-methylpyridines and chloroform molecules stopped the refinement ofA at the endR value of 0.175.

Mean Mo−X and Mo−N bonding distances are 2.40 (2), 2.25 (5) Å forA and 2.53 (3), 2.25 (1) Å forB.

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  1. Laboratorium für anorganische Chemie, Universität Ljubljana, YU-61001, Ljubljana, Jogoslawien

    J. V. Brenčič, L. Golič, I. Leban & P. Šegedin

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  1. J. V. Brenčič
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  2. L. Golič
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  3. I. Leban
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  4. P. Šegedin
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Brenčič, J.V., Golič, L., Leban, I. et al. Komplexe des zweiwertigen Molybdäns, Derivate des Oktahalodimolybdat(II)-Ions, 4. Mitt.: Darstellungen und Kristallstrukturen von zwei neutralen Komplexen mit 4-Methylpyridin. Monatshefte für Chemie 110, 1221–1228 (1979). https://doi.org/10.1007/BF00910969

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