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1Author    HerbertW. Roesky, Wilfried Schmieder, Klaus AmbrosiusRequires cookie*
 Title    Über Additionsreaktionen von zinnorganischen Verbindungen mit N.N' -Bis(pentafluorphenyl)-sehwefeldiimid Addition Reactions of Tinorganic Compounds with N,N'-Bis(pentafluorophenyl)sulfurdiimide  
 Abstract    The reactions of N,N / -bis(pentafluorophenyl)sulfurdiimide with [(CH3)3Sn]2NCH3, [(CH3)3Sn]3N and [(CHg^SnJaNCeFs yiels the 1:1 adducts 1-3. *H and 19 F NMR investiga-tions show, that fluorine atoms in the ortho position of the phenyl ring coordinate to the tin atom. This causes an increase of electron density at tin. A similar interpretation is given for the adduct 4 of N,N'-bis(^-chlorophenylsulfonyl)sulfurdiimide and [(CH3)3Sn]2NCH3, where an oxygen atom of the sulfonyl group is bonded to tin. 
  Reference    Z. Naturforsch. 34b, 197—199 (1979); eingegangen am 28. September 1978 
  Published    1979 
  Keywords    Pentafluorophenyl Derivatives, Tin, Coordination Compounds 
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 TEI-XML for    default:Reihe_B/34/ZNB-1979-34b-0197.pdf 
 Identifier    ZNB-1979-34b-0197 
 Volume    34 
2Author    Martin DrägerRequires cookie*
 Title    5-Chlor-5-phenyl-l-oxa-4.6-dithia-5-stannocan, ein diplanarer Übergangszustand bei der Racemisierung der Wanne-Sessel- Konformation in einem 8-Ring [1] 5-Chloro-5-phenyl-l-oxa-4,6-dithia-5-stannocane, a Diplanar Transition State for the Racemisation of the Boat-Chair Conformation in an Eight-Membered Ring [1]  
 Abstract    The title compound has been synthesized from PhSnCl3 and the disodium salt of bis(2-mercaptoethyl)ether. The crystal structure has been determined and refined to R — 0.033. The conformation of the eight-membered heterocycle is slightly disordered and represents a diplanar form, which is generally considered the transition state near the saddle point of the energy surface between the two enantiomers of the boat-chair con-formation. The configuration around tin is a trigonal bipyramid with equatorial sulfur atoms, an equatorial phenyl group and with axial atoms CI and O (transannular distance Sn--0 241 pm). 
  Reference    Z. Naturforsch. 36b, 437—440 (1981); eingegangen am 4. Februar 1980 
  Published    1981 
  Keywords    Tin, Heterocycles, Conformation, Transition State 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-0437.pdf 
 Identifier    ZNB-1981-36b-0437 
 Volume    36 
3Author    Axel Blecher, Martin Dräger, Bernd MathiaschRequires cookie*
 Title    (MeSn)4Se6, Geometrie und Schwingungsformen eines Adamantan-Gerüstes aus Zinn-Selen-Bindungen (MeSn)4Se6, Geometry and Vibrational Modes of an Adamantane Framework Formed by Tin-Selenium Bonds  
 Abstract    The title compound has been synthesized by reaction of MeSnBra and NaHSe in aqueous solution. The X-ray structure determination showed adamantane-like molecules (Sn-Se 253(1), Sn-C 215(1) pm) arranged in a quasi hexagonal-close packing. The atomic coordinates were used for an analysis of the vibrational spectra, yielding information on the distribution of the potential energy for the normal modes in terms of internal co-ordinates and a set of force constants. The valence force constants f(Sn-Se) 154(6), f(Sn-C) 216(2) N/m) are compared with those in related monocyclic molecules. 
  Reference    Z. Naturforsch. 36b, 1361—1367 (1981); eingegangen am 7. Mai 1981 
  Published    1981 
  Keywords    Tin, Selenium, Cage, Molecular Vibrations 
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 TEI-XML for    default:Reihe_B/36/ZNB-1981-36b-1361.pdf 
 Identifier    ZNB-1981-36b-1361 
 Volume    36 
4Author    D. Tudela, V. Fernandez, J. D. TorneroRequires cookie*
 Title    Reactions of (SCN )2 with SnX4 (X = B r, I) A utönom a, Canto B lan co, Madrid 3 4 , Spain  
 Abstract    Fro m the reaction between (S C N)2 and Snl4 a compound is formed the formula o f which is IS n (N C S)3-I2, in which I2 m olecules form charge-transfer com plexes with thiocyanate groups. IS n (N C S)3 can be isolated from this com pound. Both compounds were characterised by m eans of elem ental analyses and U V -visible, IR and 119Sn M össbauer spectra, and a polym er structure with thiocyanate bridges was deduced. The equilibrium constant was calculated for the reaction: IS n (N C S)3-I2(solid) + CS2^± IS n (N C S)3(so lid)+ I2(solution) K = 2 . 2 ± 0 . 3 x l 0 -3 mol I-1 , and it was found that the two solid com pounds form a single phase. S nBr4 forms an unstable addition com pound with (S C N)2, which decom poses even below 0 °C. 
  Reference    Z. Naturforsch. 39b, 791—794 (1984); received D ecem ber 21 1983 
  Published    1984 
  Keywords    Tin, Thiocyanogen, Iodine, Charge Transfer 
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 TEI-XML for    default:Reihe_B/39/ZNB-1984-39b-0791.pdf 
 Identifier    ZNB-1984-39b-0791 
 Volume    39 
5Author    HerbertW. Roesky, Ulrich Seseke, Mathias Noltemeyer, GeorgeM. SheldrickRequires cookie*
 Title    Darstellungen und Strukturen viergliedriger Metall-Stickstoff-Ringe Preparations and Structures of Four-Membered Metal-Nitrogen Rings  
 Abstract    Ph 3 P=NSiMe 3 (1) reacts with InCl 3 , SnCl, and FeCl, to yield (Ph,P=N) 2 (InCl 2) 2 • 2 DMF (2a), (Ph 3 P=N) 2 Sn 2 Cl 4 • 2 CH 3 CN (3a) and (Ph 3 P=N) 2 (FeCl 2) 2 (4). The X-ray single crystal structures of 2a, 3a and 4 are reported. The compounds form four-membered rings consisting of alternating metal and nitrogen atoms. 2a and 4 are symmetrical, but 3a has both a Sn(II)Cl and a Sn(IV)Cl 3 group in the four-membered ring. 
  Reference    Z. Naturforsch. 43b, 1130—1136 (1988); eingegangen am 29. März 1988 
  Published    1988 
  Keywords    Indium, Tin, Iron, X-Ray 
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 TEI-XML for    default:Reihe_B/43/ZNB-1988-43b-1130.pdf 
 Identifier    ZNB-1988-43b-1130 
 Volume    43 
6Author    BemdW. Rackm, SergeiV. PonomarevbRequires cookie*
 Title    Decomposition of Ethoxyethynyl(trimethyl)tin -Studied by 119Sn and 13 C NMR Spectroscopy  
 Abstract    A The thermally induced decomposition o f ethoxyethynyl(trimethyl)tin (1) was studied by ll9Sn NM R which revealed the formation o f bis(trimethylstannyl) ketene (2) as the major product, bis(trimethylstannyl) acetic acid ethyl ester (3) as a minor product, and a small amount o f tetramethyltin (4). Full NM R data sets, including coupling constants and isotope induced chemical shifts 1 _ \ 12 13C(1 l9Sn) are provided for 1 -3 . The first example o f ultra-high resolution " 9Sn NM R is shown. 
  Reference    Z. Naturforsch. 54b, 705 (1999); received February 23 1999 
  Published    1999 
  Keywords    lkynes, Ketenes, Tin, NMR Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0705.pdf 
 Identifier    ZNB-1999-54b-0705 
 Volume    54 
7Author    K. Diehl, D. Khodadadeh, J. Kummer, SträhleRequires cookie*
 Title     
 Abstract    Upon use of a synthetic method reported earlier by us respective alloys of Na/Sn, Na/Ge and Na/Sb are dissolved in ethylene-diamine and the title compounds precipitated from the solutions in high yield. By recrystal-lisation well shaped, stable crystals are obtain-ed. The crystal structure of [Na4 • 7 en]Sn9 confirms the presence of a Sn9 4 ~-polyhedron which had been suggested by us on the basis of other investigations. The Sn9 4_ -polyhedron may be described as a distorted tricapped trigonal prism. Ethylenediamine is coordi-nated to Na+-ions exclusively. 
  Reference    (Z. Naturforsch. 31b, 522—524 [1976]; eingegangen am 16. Februar 1976) 
  Published    1976 
  Keywords    Polyanionic Compounds, Germanium, Tin, Antimony, Crystal Structure 
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 TEI-XML for    default:Reihe_B/31/ZNB-1976-31b-0522_n.pdf 
 Identifier    ZNB-1976-31b-0522_n 
 Volume    31 
8Author    Ekkehard Lindner, Ulrich AnsorgeRequires cookie*
 Title    Tri-und Tetraseleninato-Komplexe von Zinn Tri-and Tetraseleninato Complexes of Tin  
 Abstract    Two tri-and tetraseleninato complexes of tin, RSn(02SeR)3 (1) and Sn(02SeR)4 (2) (R =C6H5), are obtained from trichlorophenyltin and tetra-chlorotin ,resp. with sodium benzeneseleninate. On the basis of the IR and Raman spectra 1 and 2 probably are polymeric mixed seleninato-0,0'-seleninato-0 complexes (c.n. = 6). 
  Reference    Z. Naturforsch. 33b, 341—342 (1978); eingegangen am 30. Dezember 1977 
  Published    1978 
  Keywords    Polymerie Seleninato Complexes, Tin, IR, Raman 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0341_n.pdf 
 Identifier    ZNB-1978-33b-0341_n 
 Volume    33 
9Author    HerbertW. Roesky, Klaus AmbrosiusRequires cookie*
 Title    Über Reaktionen von 3-trifluormethylphenylsubstituierten silicium-und zinnorganischen Verbindungen Reactions of 3-Trifluoromethylphenyl Substituted Silicon and Tin Organic Compounds  
 Abstract    Several routes were investigated for the preparation of 3-CF3C6H4N[Si(CH3)3]2 2 and 3-CF3C6H4N[Sn(CH3)3]2 3. The latter compound reacts with 3-CF3C6H4NCO to yield [3-CF3C6H4(CH3)3SnN]2CO 4. A substituted urea 5 is also formed from [(CH3)3Si]2NCH3 and 3-CF3C6H4NCO. 5 is used for the preparation of cyclic compounds, with S2CI2 the ten-membered ring (3-CF3C6H4NCONCH3S2)2 6 is formed. 5 and HN(S02C1)2 yield the six-membered ring 3-CF3C6H4NC0NCH3(S02)2NH 7. SeOCl2 and 5 react under formation of a spiro compound (S-CFsCeHjNCONCHs^Se 8. The compounds were characterized on the basis of mass and 19 F NMR spectra. Am Beispiel des CF3S02N[Sn(CH3)3]2 und seiner 
  Reference    Z. Naturforsch. 33b, 759—762 (1978); eingegangen am 24. April 1978 
  Published    1978 
  Keywords    Fluoro Compounds, Cycles, Silicon, Tin, Metal Organic Derivatives 
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 TEI-XML for    default:Reihe_B/33/ZNB-1978-33b-0759.pdf 
 Identifier    ZNB-1978-33b-0759 
 Volume    33 
10Author    AnneU. Tzolino, K. Arsten BluhmRequires cookie*
 Title    Synthese und röntgenographische Charakterisierung von zwei neuen Verbindungen des Ludwigit-Strukturtyps: Co5Sn(B0 3)2 0 4 und Co5Mn(B0 3 )20 4  
 Abstract    Synthesis and X -R ay C haracterization o f Two New Com pounds with Ludw igite-Structure: C o5S n (B 0 3)20 4 and C o5M n (B 0 3)20 4 The compounds Co5Sn(B 03)20 4 (I) and Co5M n(B03)20 4 (II) were prepared by using a B20 3 flux technique. Single crystals were investigated by X-ray diffraction and showed orthorhombic symmetry, space group D2h-Pbam (No. 55), I a = 944.4; b = 1233.8; c = 310.5 pm; Z = 2 and II a = 925.07; b = 1241.67; c = 305.24 pm; Z = 2. Both compounds are isotypic to the mineral Ludwigite. All metal point positions show an octahedral oxygen coordination. Co2+ and M4+ (M = Sn or Mn) occupy one point position statistically. Both structures contain isolated, trigonal planar B 0 3 units and oxygen atoms that are not coordinated to boron. 
  Reference    Z. Naturforsch. 51b, 305—308 (1996); eingegangen am 28. September 1995 
  Published    1996 
  Keywords    Cobalt, Tin, Manganese, Borate Oxide, Crystal Structure 
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 TEI-XML for    default:Reihe_B/51/ZNB-1996-51b-0305.pdf 
 Identifier    ZNB-1996-51b-0305 
 Volume    51 
11Author    Bernd Wrackmeyer, Jürgen WeidingerRequires cookie*
 Title    N-Boryl-Substituted Bis(amino)stannylenes and -plumbylenes  
 Abstract    Two equivalents of N-lithio-N-trimethylsilyl-amino-9-borabicyclo[3.3.1]nonane (1) react with tin and lead dichloride by salt elimination to give the corresponding bis(amino)stannylene 2 and -plumbylene 3, respectively. The compounds 2 and 3 are monomers in solution and were characterized by 'H , i3C, 14N, 29Si, ll9Sn and 207Pb NMR spectroscopy. 
  Reference    Z. Naturforsch. 52b, 947—950 (1997); received May 22 1997 
  Published    1997 
  Keywords    Boron, Tin, Lead, Metal Amides, NMR Spectra 
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 TEI-XML for    default:Reihe_B/52/ZNB-1997-52b-0947.pdf 
 Identifier    ZNB-1997-52b-0947 
 Volume    52 
12Author    Max Herberhold, Silke Gerstmann, Bernd WrackmeyerRequires cookie*
 Title    Tetrakis(sulfurdiimido)silane, -germane and -stannane  
 Abstract    Two tetrakis(sulfurdiimido)silanes [Si(NSNR)4 (R = rBu la, SiMe3 lb)], two germanes [Ge(NSNR)4 (R = rBu 2a, SiMe3 2b)] and one stannane [Sn(NSN?Bu)4Sn 3a] were prepared and characterised by 'H, l3C, i5N, 29Si and ll9Sn NMR spectroscopy in solution, and 3a was also studied in the solid state by 1 l9Sn CP/MAS NMR. Whereas la,b and 2a,b are monomeric in solution, the 119Sn NMR data suggest that 3a is associated both in solution and in the solid state, and that the tin atoms are hexa-coordinated. The attempted stepwise synthesis of la by using one, two, three or four equivalents of K[(NSN)rBu] led to mixtures of la with Cl3Si(NSNrBu) 4a, Cl2Si(NSN/Bu)2 5a, and ClSi(NSNfBu)3 6a. Only one sulfurdiimido ligand of the silane la reacted with hexachlorodisilane by oxidative addition and cleavage of the Si-Si bond to give the new heterobicyclic derivative 7a which is held together by two different coordinative N-Si bonds. 
  Reference    Z. Naturforsch. 53b, 573—580 (1998); received March 30 1998 
  Published    1998 
  Keywords    Silicon, Germanium, Tin, Sulfur Diimides, Heterocycles, NMR Data 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0573.pdf 
 Identifier    ZNB-1998-53b-0573 
 Volume    53 
13Author    Matthias Westerhausena, Mathias Kroftaa, Nils Wiberga, Jörg Knizeka, Heinrich Nötha, Arno PfitznerbRequires cookie*
 Title    Tetrazinn(II)-und Bariumtrizinn(II)-tetrakis[/i3 -tri-ter/-butyIsilylphosphan- diid]-Verbindungen mit einem Tetrametallatetraphosphacuban-Gerüst Tetratin(II) and Barium Tritin(II) Tetrakis[//3-tri-rm-butylsilylphosphandiide] Compounds with a Tetrametallatetraphosphacubane Core  
 Abstract    The metalation o f tri-terr-butylsilylphosphane with bis[bis(trimethylsilyl)amino]stannylen yields nearly quantitatively the tetrameric tin(II) tri-terf-butylsilylphosphandiide with a central Sn4 P4 cubane moiety. Barium bis[tri-/£Tf -butylsilylphosphanide] is accessible via the reaction o f tri-?£T/-butylsilylphosphane with barium bis[bis(trimethylsilyl)amide] in the molar ratio 2 : 1 . This phosphanide reacts with bis[bis(trimethylsilyl)amino]stannylen to give barium tritin(II) tetrakis[/i3-tri-ter?-butylsilylphosphandiide]. Crystallographic data of 1: P 21212), T = 193 K, a = 1532.6(3), b = 2120.2(4), c = 2194.0(5) pm, V = 7.129(3) nm3, Z = 4, R, = 0.0360 (9132 observed data [I > 2a(f)]), wR2 = 0.1064 (all data); crystallographic data of 3: P 2,/c, T= 193 K, a = 1927.35(1), b = 1799.27(2), c = 2201.35(2) pm, ß = 93.010(1)°, V= 7.6234(1) nm3, Z = 4, R, = 0.0321 (11993 observed data [I > 2cr(/)]), wR2 = 0.0772 (all data). 
  Reference    Z. Naturforsch. 53b, 1489—1493 (1998); eingegangen am 3. Juli 1998 
  Published    1998 
  Keywords    Arene Complexes, Barium, Heterocubanes, Phosphorus, Tin 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-1489.pdf 
 Identifier    ZNB-1998-53b-1489 
 Volume    53 
14Author    Nils Wiberg, Hans-Wolfram Lemer, Susanne Wagner, Heinrich Nöth+, Thomas Seifert+Requires cookie*
 Title    On an Octastannanediide R*6Sn8[Na(THF)2]2 and the Possible Existence of an Octastannane R*6Sn8 [ 1 ]  
 Abstract    The black, air and moisture sensitive octastannanediide R*6Sn8[Na(THF)2]2 (4) (R* = Si/Bu3) is prepared by reaction of Sn[N(SiM e3)2]2 with R*Na in rBuOMe at -78°C . Red brown octa­ stannane R*6Sn8 (5) is formed by thermolysis of the tristannacyclopropene R*4Sn3 in benzene at 100 °C. According to the result of the X-ray structural analysis, 4 contains a Sn8 cubane with six Sn atoms each connected with R* and two at the end o f a space diagonal connected with Na(THF)2. A preliminary X-ray structure analysis shows 5 to adopt the same Sn8 cubane structure as 4 with two bare Sn atoms at the end of a space diagonal. 
  Reference    Z. Naturforsch. 54b, 877—880 (1999); eingegangen am 1. April 1999 
  Published    1999 
  Keywords    Silicon, Tin, Sodium, Tincluster, X-Ray Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-0877.pdf 
 Identifier    ZNB-1999-54b-0877 
 Volume    54 
15Author    BerndW. Rackmeyer1 ', Saqib Alib, Wolfgang Storch0, Martina VosteencRequires cookie*
 Title    2-[N,N-Bis(trimethylstannyl)amino]pyridine and Bis[N-(N-trimethyIsiIyI- 2-aminopyridyI)]dimethyltin -Intramolecular N-Sn Co-ordination  
 Abstract    2-[N,N-Bis(trimethylstannyl)amino]pyridine (1), bis[N-(N-trimethylsilyl-2-aminopyridyl)]-dimethyltin (2) and bis[N-(N-trimethylsilyl-2-amino-3-methyl-pyridyl)]dimethyltin (3) were prepared and characterized by 'H, i3C, l5N, 29Si and ll9Sn NMR spectroscopy. In the case of 1, intramolecular pyridine-N-Sn co-ordination was established by the low temperature ll9Sn NMR spectra which show two resonance signals, one for a penta-co-ordinate and one for a tetra-co-ordinate tin site. In the cases of 2 and 3, intramolecular pyridine-N-Sn co-ordination follows conclusively from l3C, l5N and ll9Sn NMR parameters. In contrast with the known behaviour of the corresponding trimethyltin derivative, the methyl group in 3-position of the pyridine ring does not prevent this type of co-ordination in 3. 
  Reference    Z. Naturforsch. 54b, 1165—1169 (1999); received June 17 1999 
  Published    1999 
  Keywords    Tin, Amines, Pyridine, Co-ordination, NMR Data 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1165.pdf 
 Identifier    ZNB-1999-54b-1165 
 Volume    54 
16Author    KurtO. Klepp, Ferdinand Fabian, *. Sonderdruckanforderungen, Prof Kurt, O. KleppRequires cookie*
 Title    Darstellung und Kristallstruktur von Rb6Sn2S7 New Chalcogenometallates with Binuclear Anions, I: Preparation and Crystal Structure of Rb6Sn2S7  
 Abstract    Colorless crystals of the new thiostannate Rb6Sn2S7 were obtained by reacting a stoichio­ metric melt of Rb2S, Sn and S at 700°C. The compound is orthorhombic, oP60, s.g. f '2,2,2, (No. 19) with a = 9.982(4), b = 13.45(1), c = 15.20(1) A; Z = 4. The crystal structure was determined from diffractometer data and refined to a conventional R of 0.043 (1380 Fo's, 137 variables). The crystal structure contains dimeric anions, [Sn2S7]2 -, which are built up by slightly distorted SnS4 tetrahedra sharing a common sulfur atom. The mean Sn-S bond length calculates as 2.384 Ä, the bond angle on the bridging S is 110.4°. The structure contains six independent Rb-cations which are coordinated to 5-6 sulfur atoms in irregular configurations. Neue Chalkogenometallate mit binuklearen Anionen, I: 
  Reference    Z. Naturforsch. 54b, 1505—1509 (1999); eingegangen am 13. September 1999 
  Published    1999 
  Keywords    Crystal Structure, Chalcogenides, Thiostannates, Rubidium, Tin, Sulfur 
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 TEI-XML for    default:Reihe_B/54/ZNB-1999-54b-1505.pdf 
 Identifier    ZNB-1999-54b-1505 
 Volume    54 
17Author    Reinhard Matthes, Hans-Uwe SchusterRequires cookie*
 Title    Ternäre Natriumphasen mit Cadmium bzw. Quecksilber und Zinn bzw. Blei Ternary Sodium Phases with Cadmium or Mercury and Tin or Lead  
 Abstract    Four ternary sodium phases with the formula Na2BX (B = Cd, Hg; X = Sn, Pb) were prepared and structurally investigated. The structures of the cubic phases Na2HgSn, Na2CdPb and Na2HgPb (space group F43m) are closely related to LiaBi, that of Na2CdSn (space group P63mmc) to the hexagonal structure of NaßAs. 
  Reference    Z. Naturforsch. 35b, 778—780 (1980); eingegangen am 8. Februar 1980 
  Published    1980 
  Keywords    Ternary Intermetallic Phases, Sodium, Cadmium, Mercury, Tin, Lead, Crystal Structures 
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 TEI-XML for    default:Reihe_B/35/ZNB-1980-35b-0778_n.pdf 
 Identifier    ZNB-1980-35b-0778_n 
 Volume    35 
18Author    Peter KlüfersRequires cookie*
 Title    Die Kristall-und Molekülstrukturen der  
 Abstract    Verbindungen [Cl4_xSn{C o(C O)4}xl mit x = 1 ,2 und 3 The Crystal and M olecular Structures of the Compounds [Cl4_vSn{Co(CO)4} v] with x = 1,2 and 3 The crystal structures o f the com pounds [Cl3SnCo(CO)4] 1, [Cl2Sn{C o(C O)4} 2] 2, and [C lSn{C o(C O)4}3] 3, have been determined by X-ray crystallography. Sn is co-ordinated 
  Reference    Z. Naturforsch. 46b, 187—191 (1991); eingegangen am 16. Juli 1990 
  Published    1991 
  Keywords    Tetracarbonylcobaltio-chloro-stannanes, Tin, Cobalt, Carbonyl, X -R ay Structure 
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 TEI-XML for    default:Reihe_B/46/ZNB-1991-46b-0187.pdf 
 Identifier    ZNB-1991-46b-0187 
 Volume    46 
19Author    Anja Loose, WilliamS. SheldrickRequires cookie*
 Title    Solventothermal Synthesis of the Lamellar Selenidostannates(IV) A2Sn4Se9*H20 (A = Rb, Cs) and Cs2Sn2Se6  
 Abstract    Reaction of A 2C O 3 with Sn and Se in an H 2O /CH 3OH mixture at 115 -130°C affords the isotypic lamellar selenidostannates A2Sn4Se9-H20 1 (A = Rb) and 2 (A = Cs). The polyanions ^ [Sn4Se92~] exhibit S ^ S e s molecular building units, in which two adjacent Sn(IV) atoms of an Sn4Se4 8-membered ring are bridged by an additional Se atom. These units connect through (SnSe)2 4-mem bered rings to afford a 44 anionic net with 16-membered cavities. Cs2Sn2Se6 (3) may be prepared by methanolothermal reaction of CstCO^ with SnSe and Se at 130°C and contains porous 2 [SnTSeö2 -] sheets in which [SnSes--] ribbons are linked through Se-Se bonds. The resulting 4 net displays 14-membered pores in which the Cs cations reside. 
  Reference    Z. Naturforsch. 53b, 349—354 (1998); received December 29 1997 
  Published    1998 
  Keywords    Tin, Selenium, Selenidostannates(IV), Lamellar Structures, Solventothermal Synthesis 
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 TEI-XML for    default:Reihe_B/53/ZNB-1998-53b-0349.pdf 
 Identifier    ZNB-1998-53b-0349 
 Volume    53 
20Author    Bernd Wrackmeyer3, Jürgen Weidinger3, Heinrich Nöthb, Wolfgang Storchb, Thomas Seifertb, Martina VosteenbRequires cookie*
 Title    Determination of Coupling Signs 17 (119Sn, 15N ) and 2/ ( 119Sn, 117Sn) in Trimethylstannylamines  
 Abstract    The l5N-labelled trimethylstannylamines 1 -3 [(M e3Sn)3N, (M e3Sn)2NPh, (M e3Sn)2N-BCgHi4 (BCgHi4 = 9-borabicyclo[3.3.0]nonyn and the non-labelled 4, Me3 Sn-N(BC8Hi4)2 , were prepared and studied by 1H, 1 C, l5N and l9Sn NMR. The l5N ultrahigh resolution NMR spectra of 1 revealed otherwise unobserved parameters such as 2/ (15N ,S n ,'C) and the isotope induced chemical shift 2 zAl2/l3C (l5N). ll9Sn NM R spectra of 1, recorded under similar con­ ditions, also show new parameters such as V (' |ySn,N,Sn,l3C) which are not resolved in the non-labelled derivative. By using various types o f two-dimensional heteronuclear shift corre­ lations, absolute coupling signs o f l7 (l l9 Sn,15N) (all < 0) in 1 -3 were determined. By the same techniques it proved possible to confirm the negative sign o f :7(Sn,Sn) (-195.4 Hz) in 1. In contrast, the coupling constants 27(Sn,Sn) for 2 (+71.7) and 3 (+62.0) possess a positive sign. This sign inversion, observed here for the first time for apparently similar compounds, demonstrates the enormous influence o f substituents on the nature o f the lone pair o f electrons at the nitrogen atom. It also shows that these experiments for sign determinations o f coupling constants are necessary in order to interpret these data correctly. 
  Reference    Z. Naturforsch. 53b, 1494—1500 (1998); received July 30 1998 
  Published    1998 
  Keywords    Tin, Amines, NM R Data, Ultrahigh Resolution, Coupling Sign Determination 
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 Identifier    ZNB-1998-53b-1494 
 Volume    53 
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