77611-46-2Relevant academic research and scientific papers
Tetraamidodichromium(II) compounds and their dihalomethane adducts. Structures of Cr2[(2,6-xylyl)NC(CH3)O]4·1.5C 6H5CH3 and M2[(2,6-xylyl)NC(CH3)O]4·2CH 2Br2, M = Cr, Mo
Baral, Subhash,Cotton, F. Albert,Ilsley, William H.
, p. 2696 - 2703 (2008/10/08)
The structures of the compounds Cr2[(2,6-xylyl)NC(CH3)O4]·1.5C 6H5CH3 (1) and M2[(2,6-xylyl)NC(CH3)O]4·2CH 2Br2, M = Cr (2) and Mo (3) are reported. Compound 1 crystallizes in the monoclinic space group P21/c and has crystallographic parameters a = 16.219 (2) A?, b = 15.290 (2) A?, c = 19.360 (2) A?, β = 92.21 (1)°, V = 4798 (2) A?3, and Z = 4. The Cr-Cr bond length is 1.937 (2) A?, and the average Cr-O and Cr-N distances are 1.957 (5) and 2.078 (9) A?, respectively. Associated with each molecule are 1.5 C6H5CH3 molecules, one of which occupies a general position within the cell and the other is disordered on an inversion center. Compounds 2 and 3 crystallize in the orthorhombic space group Pccn with eight molecules per unit cell. The unit cell constants for the Cr and Mo compounds, respectively, are a = 31.107 (5), 31.300 (4) A?, b = 15.852 (2), 15.944 (3) A?, c = 18.321 (3), 18.378 (2) A?, V = 9034 (4), 9171 (4) A?3, and Z = 8. Each molecule resides on a general position within the unit cell. The Cr-Cr and Mo-Mo distances are 1.961 (4) and 2.085 (2) A?, respectively. The average M-O and M-N distances are 1.97 (1) and 2.08 (1) A?, and 2.12 (1) and 2.20 (2) A? for the Cr and Mo compounds, respectively The two CH2Br2 moieties occupy positions along the axial extensions of the M-M bonds with M-Br distances of 3.554 (5) and 3.335 (4) A? for the Cr compound and 3.544 (4) and 3.390 (3) A? for the molybdenum compound. The Cr-Cr bond distance in 1 requires revision of our earlier conclusions concerning the extent of axial interactions in 2 and its previously described CH2Cl2 analogue.
