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- W2068698709 abstract "Abstract Using electron-diffraction data collected at 385 K in the Balzers KDG2 instrument at UMIST, Sn(NMe 2 ) 2 in the gas phase was found to consist of a mixture of monomer and dimer. The structural details remained unelucidated until the publication by Olmstead and Power (Inorg. Chem., 23 (1984) 413) of the crystal structure of the dimer at 85 K. The crystal-structure parameters did not fit the electron-diffraction pattern exactly, and a flatter less distorted dimeric structure was found in the gas phase. Ignoring the hydrogen atoms, the dimer has C 2h symmetry with a planar NSnNSn ring of dimensions SnN=2.293(5) A and ∠ NSnN=83.9(5)°. The two-fold axis passes through the ring N atoms; the (horizontal) mirror plane through the Sn atoms contains the atoms of the two −NC 2 side chains, one on each side of the ring plane with ∠ XSnN=156.1(5)° (X is the ring centre) compared with 103° in the crystalline dimer. The side chains have dimensions SnN=1.996(4), NC=1.483(3) A and ∠ SnNC=118.1(3)° at the planar N atoms; these parameters are the average for the dimer and the similar SnNC 2 groupings of the monomer, which has ∠ NSnN=95(1)°. The monomer has C 2v symmetry with the (vertical) mirror plane which contains NSnN bisecting the ∠ CNC angles at the planar N atoms. Both the dimer and the monomer appear to have freely rotating methyl groups at 385 K. In the dimer, the three bond angles at each Sn atom add up to 350°." @default.
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- W2068698709 title "The gas-phase molecular structures of monomeric and dimeric bis(dimethylamino)Tin(II), Sn(NMe2)2. An electron diffraction study" @default.
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