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1978 (3)
1Author    Cyclic Diazastannylenes, Iii, M. VeithRequires cookie*
 Title    Cyclische Diazastannylene, DI 1 Die Kristall-und Molekülstruktur der monoklinen Phase von 1.3-Di-feri-butyl-2.2-dimethyl- 2 -diazasilastannetidin The Crystal and Molecular Structure of the Monoclinic Phase of l,3-Di-feri-butyl-2,2-dimethyl-l,3,2,4A 2 -diazasilastannetidine  
 Abstract    The crystal and molecular structure of the monoclinic phase of l,3-di-£eri-butyl-2,2-dimethyl-l,3,2,4A 2 -diazasilastannetidine has been determined from three-dimensional X-ray data collected on a two-circle diffractometer at —120 °C (MoKa radiation, 2623 re-flexions, R — 0,050). The crystals are monoclinic, space group C 2/c, with cell dimensions a = 10.655(5), b = 25.75(1), c = 17.33(1) A, ß = 106.8(1)° and Z = 12. Four monomeric (crystal site symmetry 2 (C2)) and four dimeric units (crystal site symmetry I (Cj)) are present in the structure interacting over tin-tin (3.68 A). Remarkable are the very short Sn-N bond (2.09 A) in the monomer and the donation bond Sn-N (2.39 Ä) in the dimer. The coordination of the tin atoms in the different units is discussed in detail. 
  Reference    (Z. Naturforsch. 33b, 7—13 [1978]; eingegangen am 5. September/6. Oktober 1977) 
  Published    1978 
  Keywords    Diazastannylenes, X-ray, Molecular Structure, Crystal Structure 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0007.pdf 
 Identifier    ZNB-1978-33b-0007 
 Volume    33 
2Author    Cyclic Diazastannylenes, Iv, M. Veith, 0. Reckten, Wald, E. HumpferRequires cookie*
 Title    Cyclische Diazastannylene, IV 1 Zur Oxidation von 1.3-Di-ferf-butyl-2.2-dimethyl- 2 -diazasilastannetidin Oxidation of l,3-Di-£erJ-butyl-2,2-dimethyl-1,3,2,4A 2 -diazasilastannetidine  
 Abstract    The reactions of l,3-di-<er^-butyl-2,2-dimethyl-l,3,2,4A 2 -diazasilastannetidine (1) with O2 and Sß or SnCU proceed in two steps: In a first redoxtype reaction an intermediate containing tetravalent tin is formed. Some of these intermediates are unstable with respect to the starting material stannylene 1 and undergo a substitution reaction to yield a spiro-tetraazastannane. Under appropriate conditions the intermediate from the sulfur-and SnCLi-reaction can be isolated and turns out to be either dispiro[3,3,3]distanna-disulfa-disila-tetrazane or a diaza-dichlorostannane respectively. Crystal and kinetic data of some products/reactions are reported. 
  Reference    (Z. Naturforsch. 33b, 14—19 [1978]; eingegangen am 14. September 1977) 
  Published    1978 
  Keywords    Diazastannylenes, Unsymmetrically Substituted Stannanes, Kinetic Data, NMR, Crystal Data 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0014.pdf 
 Identifier    ZNB-1978-33b-0014 
 Volume    33 
3Author    M. VeithRequires cookie*
 Title    Cyclische Diazastannylene, II 1 Intermolekulare Lewis-Säure-Base-Addukte bei 2 -Diazasilastannetidinen Cyclic Diazastannylenes, II 1 Intermolecular Lewis-Acid-Base Adducts of 1, 3,2,4A 2 -Diazasilastannetidines  
 Abstract    -diazasilastannetidines can be prepared as mono-mers (organyl = <erf-butyl) or dimers (organyl = isopropyl) in nonpolar solvents, depending on the organic nitrogen substituent. The formation of the dimer, which is due to an intermolecular Lewis-acid-base interaction of Sn(II) with nitrogen, can be initiated by solidification. When the tertf-butyl compound is cooled below 0 °C two crystalline modi-fications are found: a monoclinic phase (C 2/c; a= 10.655(5); b = 24.75(1); c = 17.334(9) Ä; ß = 106.9(1)°) and a triclinic phase (P I; a = 10.68(1); b = 13.51(1); c = 12.36(1) A; a = 96.2(1); ß = 102.6(1); y = 118.4(1)°). The crystal structures turn out to be built of dimeric and monomeric units in the first case and presumably only dimeric species in the second case. The isopropyl derivative crystallizes in the space group P 2i/b (a = 10.77(1); b= 12.14(2); c = 11.15(2) A; ß = 120.2(2)°) with only dimeric units being present, as in the liquid. Interrelationships between the three structures are discussed. 
  Reference    (Z. Naturforsch. 33b, 1—6 [1978]; eingegangen am 5. September/6. Oktober 1977) 
  Published    1978 
  Keywords    Diazastannylenes, Solid State, X-ray, Crystal Structure, NMR l, 3-Diorganyl-2, 2-dimethyl-I, 3, 2, 4A 2 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0001.pdf 
 Identifier    ZNB-1978-33b-0001 
 Volume    33