N-ISOPROPYL-2-(ISOPROPYLAMINO)TROPONIMINATE COMPLEXES OF LITHIUM AND CALCIUM

The synthesis and structures of [(i-Pr)(2)ATI]Li-2(thf)(I)(1) and )(2) ATI]Ca(thf)(2)(I)(2)Li-2(thf)(2)[(i-Pr)(2)ATI] (2) (where [(i-Pr)(2)AT I] = N-isopropyl-2-(isopropylamino)troponiminate) have been described. The lithium atoms in compounds I and 2 occupy positions above and bel ow the plane of the aminotroponiminate ligand. The calcium atom in 2 a dopts a pseudo-octahedral geometry with two tetrahydrofurans occupying the trans-positions. Compound 1 crystallizes as dimeric units. Crysta l data with MoK alpha at 193 K: 1, C17H27ILi2N2O, a = 13.217(2)Angstro m, b = 9.875(2)Angstrom, c = 16.410(4)Angstrom, B = 111.41(1)degrees, V = 1993.4(6)Angstrom(3), a monoclinic space group P2(1)/n, Z = 4, R = 0.029; 2, C42H70CaI2Li2N4O4, a = 911.390(2)Angstrom, b = 30.880(4)Ang strom, 13.465(2)Angstrom, B = 93.85(1)degrees, V = 4724( 1)Angstrom(3) , monoclinic space group C2/c, Z = 4, R = 0.027.