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Coordination of the new weakly coordinating anions Al(OCH(CF3)2)4−, Al(OC(CH3)(CF3)2)4−, and Al(OC(Ph)(CF3)2)4− to the monovalent metal ions Li+ and Tl+

1998; Elsevier BV; Volume: 128; Issue: 1-3 Linguagem: Inglês

10.1016/s1381-1169(97)00182-9

1873-314X

Thomas J. Barbarich, Susie M. Miller, Oren P. Anderson, Steven H. Strauss,

Chemical Synthesis and Characterization

The structures of Li+ or Tl+ salts of three new fluoroalkoxide-containing aluminate anions were determined by X-ray crystallography. For LiAl(OC(Ph)(CF3)2)4, monoclinic, C2/c, a=42.297(6), b=10.641(1), c=19.132(2) Å, β=114.808(9)°, Z=8, T=−100°C, R=0.052; for TlAl(OC(CH3)(CF3)2)4, monoclinic, P21/c, a=12.650(3), b=9.970(2), c=21.237(4) Å, β=94.00(3)°, Z=4, T=−100°C, R=0.073; for TlAl(OCH(CF3)2)4, monoclinic, P21/n, a=14.261(1), b=9.8024(9), c=16.911(2) Å, β=93.467(8), Z=4, T=−130°C, R=0.053. The monatomic, monovalent cations interact with their respective anions by means of M–O and M–F bonds. The Tl+ cations in TlAl(OCH(CF3)2)4 and TlAl(OC(CH3)(CF3)2)4 interact with three different aluminate anions. The Li+ cation in LiAl(OC(Ph)(CF3)2)4 interacts with only one aluminate anion, forming a rare trigonal–prismatic LiO2F4 coordination unit.