Molecular Complexes of N,N,N′,N′-Tetraisopropyloxamide. Crystal Structures of Its 1:1 Adduct with m-Cresol, and Its 1:1 and 1:2 Adducts with p-Cresol

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Abstract
The crystal structures of a 1:1 complex (I) of N,N,N′,N′-tetraisopropyloxamide with m-cresol, a 1:1 complex (II) with p-cresol, and a 1:2 complex (III) with p-cresol have been determined by X-ray crystallography. The crystal data are: I, C21H36N2O3, P21⁄c, a=12.104(4), b=6.860(3) c=27.186(8) Å, β=93.46(2)°, Z=4, and RF=0.093 for 1661 observed Mo Kα data; II, C21H36N2O3, P21⁄n, a=7.825(2), b=11.379(4), c=25.39(1) Å, β=91.01(2)°, Z=4, and RF=0.105 for 1326 data; III, C28H44N2O4, C2⁄c, a=11.744(3), b=10.658(2), c=23.576(4) Å, β=102.07(2)°, Z=4, RF=0.045 for 1382 data. The stoichiometric formulas faithfully represent the structures of all three complexes, with each phenolic OH group forming a donor hydrogen bond to an O atom of the oxamide host molecule.

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