The crystal structure of tris(l, 10-phènanthroline)nickel(n) pentacarbonylmanganate( --- I), [Ni(phen)3] [Mn(CO)5]2, has been determined from X-ray counter data collected at ---123 ± 2°. Discrete Ni(phen)32+ cations and Mn(CO)5- anions crystallize in space group PI with lattice constants a = 13.918 (5), b = 14.325 (5), c = 12.399 (8) å, a = 102.16 (4), β = 113.22 (4), -y = 98.46 (3)° at ---121°. The observed density of 1.535 (10) g/cm3 at 25° agrees well with that of 1.546 g/cm3 calculated for two formula units in the cell found at ---123°. The Ni(phen)32 + cations show approximate threefold symmetry. The N-Ni-N bite averages 79.4 (5)°; the variations in N-C and C-C bond distances in the ring system are consistent with previous structures. The Mn(CO), 5- anions are trigonal bipyramidal with a small distortion most noticeable in the equatorial plane, where the C-Mn-C bond angles range from 117.5 (3) to 125.0 (4)°. The average of the axial Mn-C bonds is slightly, but not significantly, longer than the average of the equatorial bonds. The Mn-C bond lengths range from 1.77 (1) to 1.82 (1) A; the difference in axial and equatorial bond averages is 0.02 (2) A. This difference is considered together with other d8 complexes having five identical ligands about the central metal atom.
ASJC Scopus subject areas
- Physical and Theoretical Chemistry
- Inorganic Chemistry