6533b837fe1ef96bd12a25c6

RESEARCH PRODUCT

Crystal and molecular structure of the tris(1,10-phenanthroline)potassium salt of μ-hydridobis[pentacarbonylchromium(0)]

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Abstract The crystal and molecular structure of [K(phen)3][Cr2(CO)10(μ-H)] has been determined by X-ray diffraction. The compound crystallizes in the space group P 1 with a 11.884(4), b 13.968(4), c 15.612(6) A, α 112.6(1), β 99.7(1) and γ 106.2(1)° and Z = 2. The structure was refined to R = 0.066 and RW = 0.067 for 3692 counter data with I ⩾ 3σ(I). The complex anion [Cr2(CO)10(μ-H)] adopts a bent Cr-H-Cr configuration with the equatorial carbonyl groups of the two independent Cr(CO)5 moieties in an eclipsed configuration. The Cr⋯Cr distance is 3.394(3) A and the two CrH bonds are 1.74(7) and 1.71(7) A. The CrHCr bond angle is 159(3)°. In the dimeric complex cation [K(phen)3]2, located on inversion center, the coordination polyhedron around K is unexpectedly cubic; the particular disposition of the phen molecules with short intermolecular contacts (minimum value 3.38 A) could stabilize this otherwise unfavourable cubic geometry. The K⋯K′ separation is 4.15 A and the KN bond distances range from 2.835(6) to 3.117(7) A for the non-bridging nitrogens and from 2.907(6) to 3.342(6) A for the bridging nitrogens.