ISSN:
1434-4475
Keywords:
Crystal structure, molybdenium complexes
;
Mo2Br4 Pic 4
;
Mo2Cl4 Pic 4·CHCl3
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00910969
Permalink
