Nitroso group coordination in thallium(I) oximate complexes with 18-crown-6

Crystal and molecular structures of the macrocyclic complexes [Tl(18-crown-6)(L), where {L} = {ONC(CN)C(S)N(CH)(3))(2)}(-) (P2(1)/n, monoclinic, a = 14.471(3), b = 8.447(2), c = 18.920(4) Angstrom, beta = 92.69 degrees, Z = 4; R = 0.027) and {ONC(CN)-(4-methylthiazolyl-2)}(-) (<P(1)over bar>, triclinic, a = 8.836(4), b = 11.908(5), c = 14.131(4) Angstrom, alpha = 62.84(3), beta = 74.03(3), gamma = 66.72 degrees, Z - 2; R = 0.047) have been determined from X-ray diffraction data. The structures are made up of isolated Tl(18-crown-6){L} molecules with irregular eight-coordination about Tl. In both structures the thallium atom forms close contacts (2.73-3.14 Angstrom) with both the nitrogen and oxygen atoms of the nitroso group.