Abstract
The new compounds Me 3GeN(SO 2Me) 2 ( 3) and Me 3PbN(SO 2Me) 2 ( 4) were prepared from the corresponding chlorides Me 3ECl and AgN(SO 2Me) 2 in MeCN solution. The crystallographic data at −95°C are for 3: triclinic, space group P 1 , a 771.7(2), b 1204.1(4), c 1388.4(5) pm, α 66.75(3), β 84.12(3), γ 74.15(2)°, V 1.1401 nm 3, Z = 4; for 4: monoclinic, space group P2 1/ c, a 751.1(3), b 1065.5(4), c 1493.9(5) pm, β 100.99(3)°, V 1.1738 nm 3, Z = 4. The crystal structure of 3 consists of two crystallographically independent, monomeric molecules with tetrahedral Ge atoms and trigonal- planar N atoms (average angle values: CGeC 112.7, CGeN 106.0, GeNS 121.1, SNS 117.3 °). The most striking features of the molecular structure are the extremely long GeN bond distances of 198.2(2) and 198.5(2) pm, which are equal to the uncorrected sum of the covalent single bond radii. In the crystal structure of 4, Me 3PbN(SO 2Me) 2 units are linked by an intermolecular PbO interaction (265.3(6) pm) to form infinite parallel chains. The Pb atom has a distorted trigonal-bipyramidal arrangement (NPbO 169.3; average values: CPbC 119.2, CPbN 95.5, CPbO 84.8°), in which the N atom is trigonal-planar (SNS 119.2, mean PbNS 119.8°). The PbN distance is 248.4(6) pm, i.e. 30 pm longer than the sum of the covalent radii, suggesting a mainly ionic bond character. In both structures secondary intramolecular 1,4-interactions with Ge ⋯ O distances of 295.8 and Pb ⋯ O of 328 pm, respectively, are observed.
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