136237-95-1Relevant articles and documents
Synthesis and characterization of the mononuclear compounds t-Bu2MOAr (M = Al or Ga, Ar = Bulky Aryl Group): Are the short Al-O and Ga-O bonds a consequence of π-interactions?
Petrie, Mark A.,Olmstead, Marilyn M.,Power, Philip P.
, p. 8704 - 8708 (2007/10/02)
The synthesis and characterization of the compounds t-Bu2MOAr (Ar = 2,6-t-Bu2-4-XC6H2, M = Al, and X = t-Bu, 1; Me, 2; H, 3; X = Me and M = Ga, 4) are described. They were characterized by X-ray crystallography (1, 2, and 4) and 1H NMR and IR spectroscopy. In the crystal, the structures of 1, 2, and 4 are monomeric with essentially trigonal planar coordinations at the metals and short Al-O and Ga-O bond lengths that are near 1.71 and 1.82 ?. The structural data together with VT 1H NMR studies indicate that there is probably little π-character in the M-O bonds. The shortness may be explained on the basis of an ionic bonding contribution and the low coordination number of the metal, with M-O π-interactions playing a relatively minor role. Crystal data with Mo Kα (λ = 0.71069 ?) at 130 K: 1, C26H47AlO, a = 11.386 (10), b = 29.11 (2), c = 24.969 (16) ?, β= 102.05 (6)°, monoclinic, space group Pn, Z= 12 (six molecules per asymmetric unit), R = 0.105; 2, C23H41AlO, a = 8.200 (2), b = 17.876 (4), c = 15.910 (4) ?, β= 94.47 (2)°, monoclinic, space group P21/c, Z = 4, R = 0.047; 4, C23H41GaO, a = 8.215 (1), b = 17.738 (6), c = 15.921 (4) ?, β= 94.73 (2)°, monoclinic, space group P21/c, Z = 4, R = 0.051.