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Structures of Sb(OC6H3Me2-2,6)3 and Sb(OEt)5·NH3: The First Authenticated Monomeric Sb(OR)n (n = 3, 5)

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posted on 19.02.2002, 00:00 by Graeme A. Horley, Mary F. Mahon, Kieran C. Molloy, Monica M. Venter, Peter W. Haycock, Christopher P. Myers
The first monomeric antimony alkoxides, Sb(OC6H3Me2)3 (1) and Sb(OEt)5·NH3 (2), have been crystallographically characterized. The former adopts a trigonal pyramidal geometry, while the latter is octahedral about antimony; hydrogen bonding between NH3 and SbOEt groups in Sb(OEt)5·NH3 creates a one-dimensional lattice arrangement. Reaction of pyridine with SbCl5 in EtOH/hexane yields the salt [Hpy+]9[Sb2Cl115-][Cl-]4 (3), which has also been crystallographically characterized. Crystallographic data:  1, C24H27O3Sb, a = 10.9080(2), b = 11.9660(2), c = 17.7260(4) Å, α = 109.740(1)°, monoclinic P21/c (unique axis a), Z = 4; 2, C10H28NO5Sb, a = 7.7220(1), b = 19.0700(2), c = 21.6800(3) Å, β = 93.4960(7)°, monoclinic P21/c, Z = 8; 3, C45H54Cl15N9Sb2, a = 13.4300(2), b = 14.4180(2), c = 17.4180(3) Å, α = 82.7650(7), β = 77.5570(7), γ = 70.7670(7)°, triclinic P1̄, Z = 2.

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