The crystal structure of nitrosyltetracarbonylmanganese, Mn(NO)(CO)4, has been determined from three-dimensional X-ray data collected by the precession method at -110°. The material grown from the liquid phase crystallizes in space group C6 2h-C2/c with four molecules in a cell of dimensions a = 11.72 (3) Å, b = 6.74 (2) Å, c = 9.65 (2) Å, and α = 107.8 (1)° at -110°. Leastsquares refinement of 624 independent reflections resulted in a final conventional R factor of 0.087. The Mn(NO)(CO)4 molecule is required crystallographically to possess C2 symmetry; the molecule is trigonal bipyramidal in shape. The metal-ligand bond distances and the root-mean-square amplitudes of vibration of the various atoms favor an ordered model with the nitrosyl group on the twofold axis and in the equatorial plane of the trigonal bipyramid. The axial Mn-C distance is 1.886 (8) Å while the equatorial Mn-C distance is 1.851 (8)Å; theMn-N distance is 1.797 (13) Å. The Mn-C-O and Mn-N-O bonds are linear. The structure is compared with that of the isoelectronic molecule Fe(CO)3. The structural trends in the series of compounds Mn(NO)(CO)4-z(P(C6H5)3)x, (x = 0-2) are discussed.
|Original language||English (US)|
|Number of pages||6|
|State||Published - Jun 1 1969|
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry