| | 1 | Author
| D. Tudela, V. Fernandez, J. D. Tornero | Requires 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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| default:Reihe_B/39/ZNB-1984-39b-0791.pdf | | | | Identifier
| ZNB-1984-39b-0791 | | | | Volume
| 39 | |
| 2 | Author
| Teodor Silviu Balabana ', NinaG. Furmanovab | Requires cookie* | | | Title
| 7T-7T Interactions between Pyrylium and Phenyl Rings in the Crystal | | | | Abstract
| The crystal structures of two isomeric phenyl-substituted pyrylium perchlorates, 2,6-di-methyl-4-phenylpyrylium (1) and 2,4-dim ethyl-6-phenylpyrylium (2), have been determined. Both cations are planar in the crystal so that the electron deficient pyrylium rings can interact strongly with the phenyl rings of adjacent molecules forming stacks along the shortest crys-tallographic axis. The phenyl rings may act as donors in a charge transfer interaction which is more pronounced in 1 than in 2. Charge transfer appears as a non-mandatory consequence of the 7T-7T stacking. The structures demonstrate the electrostatic nature of these interactions conforming to the model of Hunter and Sanders [ 1 ]. | | | |
Reference
| Z. Naturforsch. 52b, 485 (1997); received January 13 1997 | | | |
Published
| 1997 | | | |
Keywords
| Pyrylium Salt, Crystal Engineering, Charge Transfer, Crystal Structure | | | |
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| default:Reihe_B/52/ZNB-1997-52b-0485.pdf | | | | Identifier
| ZNB-1997-52b-0485 | | | | Volume
| 52 | |
| 3 | Author
| Horst Kunkely, AmD. Vogler | Requires cookie* | | | Title
| Photoreactivity of Titanocene Pentasulfide | | | | Abstract
| The electronic spectrum o f Cp2TiSs shows a long-wavelength absorption at Am ax = 492 nm which is assigned to the lowest-energy S52~ ^ T i IV ligand-to-metal charge transfer (L M C T) transition. The photolysis o f the complex in C H 2CI2 leads to the formation o f Cp2T iC l2 and elemental sulfur. It is suggested that L M C T excitation initiates a reductive elimination with the extrusion o f S5 while the reduced titanocene is reoxidized by the solvent. | | | |
Reference
| Z. Naturforsch. 53b, 224—226 (1998); received December 12 1997 | | | |
Published
| 1998 | | | |
Keywords
| Charge Transfer, Titanium Complexes, Sulfide Complexes, Photochemistry | | | |
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| default:Reihe_B/53/ZNB-1998-53b-0224.pdf | | | | Identifier
| ZNB-1998-53b-0224 | | | | Volume
| 53 | |
| 6 | Author
| Markus Leirer, Günther Knör, Amd Vogler | Requires cookie* | | | Title
| Synthesis and Spectroscopic Properties of 1,2-Diiminetricarbonyl- rhenium(I)chloride Complexes with Aliphatic Diimines (or 1,4-Diaza-l,3-butadienes) as Ligands | | | | Abstract
| Re(l,2-diimine)(CO)3Cl complexes with the aliphatic bidentate ligands diiminosuccino-dinitrile (DISN), benzilbisanile (BEAN), bisacetylbisanile (BABA), and benzildiimine (BE DIM) are reported. The compounds show Re(I) to 7r*(diimine) metal-to-ligand charge transfer (MLCT) absorptions in the visible spectral region. The energy of these MLCT-transitions de creases in the series BABA > BEDIM > BEAN > DISN, depending on the 7r* acceptor properties of the coordinated diimine ligands. The maxima of these CT bands undergo a solvent-dependent shift (negative solvatochromism), which indicates a partial charge redistribution in the excited state. The compounds are not photoluminescent at room temperature and 77 K. | | | |
Reference
| Z. Naturforsch. 54b, 341—344 (1999); received December 11 1998 | | | |
Published
| 1999 | | | |
Keywords
| Charge Transfer, Rhenium Complexes, 1, 4-Diaza-l, 3-butadienes, Solvatochromism | | | |
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| default:Reihe_B/54/ZNB-1999-54b-0341.pdf | | | | Identifier
| ZNB-1999-54b-0341 | | | | Volume
| 54 | |
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