12597-33-0Relevant articles and documents
Theoretical and Experimental Studies of Six-Membered Selenium-Sulfur Nitrides SexS4-xN2 (x = 0-4). Preparation of S4N2 and SeS3N2 by the Reaction of Bis[bis(trimethylsilyl)amino]sulfane with Chalcogen Chlorides
Maaninen, Arto,Siivari, Jari,Suontamo, Reijo J.,Konu, Jari,Laitinen, Risto S.,Chivers, Tristram
, p. 2170 - 2177 (1997)
The reaction of [(Me3Si)2N]2S with equimolar amounts of SCl2 and S2Cl2 produces S4N2 in a good yield. The reaction of [(Me3Si)2N]2S with a 3:1:1 mixture of S2Cl2, Se2Cl2, and SeCl4 yields a dark brown-red insoluble material that was inferred to be mainly SSeSNSN on the basis of the elemental analysis, mass spectroscopy, vibrational analysis, and NMR spectroscopy. Attempts to prepare selenium-rich species resulted in the formation of elemental selenium or Se3N2Cl2. The experimental work was supported by ab initio MO calculations which establish the structural and stability relationships of the different members of the series 1,3-SexS4-xN2 (x = 0-4). Full geometry optimization was carried out for each molecular species using the polarized split-valence MIDI-4* basis sets. The effects of electron correlation were taken into account involving the second-order M?1er-Plessett perturbation theory. Each molecule was found to lie in an approximate half-chair conformation that is well established for 1,3-S4N2 (i.e., interacting planar NEN and EEE fragments; E = S, Se). The bond parameters agree well with experimental information where available. Whereas the lengths of the bonds in the NEEEN fragment approach those of the single bonds, the bonds in the NEN fragment show marked double bond character. The stabilities of the molecules decrease expectedly with increasing selenium content as judged by the total binding energy at the MP2 level of theory. Within a given chemical composition, isomers containing a N=Se=N unit lie higher in energy than those containing a N=S=N unit. These results may explain why selenium-rich SexS4-xN2 molecules have not been isolated.
Raman band of matrix isolated NaMSeN clusters
Herwig,Schnell,Becker
, p. 462 - 466 (2004)
Selenium clusters are doped with sodium atoms in the reaction zone of a dual laser vaporization source. Product clusters SeN and Na 2SeN with N=4-8 are deposited in a nitrogen matrix and investigated by Raman spectroscopy. Beside the Raman band of pure Se N clusters, a new intense band between 165 and 225 cm-1 is observed. Within a simple model of dynamical charge transfer the new band is attributed to certain vibrational modes with considerable changes of Na-Se bond lengths. The assignment is confirmed by density functional calculations. A bonding model for the Na2SeN clusters containing horseshoe shaped polyanionic selenium chains is developed.
Sandmeyer-Type Trifluoromethylthiolation and Trifluoromethylselenolation of (Hetero)Aromatic Amines Catalyzed by Copper
Matheis, Christian,Wagner, Victoria,Goossen, Lukas J.
supporting information, p. 79 - 82 (2016/01/25)
Aromatic and heteroaromatic diazonium salts were efficiently converted into the corresponding trifluoromethylthio- or selenoethers by reaction with Me4NSCF3 or Me4NSeCF3, respectively, in the presence of catalytic amounts of copper thiocyanate. These Sandmeyer-type reactions proceed within one hour at room temperature, are applicable to a wide range of functionalized molecules, and can optionally be combined with the diazotizations into one-pot protocols.
Preparation, X-ray Structure, and Spectroscopic Characterization of 1,5-Se2S2N4
Maaninen, Arto,Laitinen, Risto S.,Chivers, Tristram,Pakkanen, Tapani A.
, p. 3450 - 3454 (2008/10/08)
The reaction of [(Me3Si)2N]2S with equimolar amounts of SCl2 and SO2Cl2 produces S4N4 in a good yield. The new chalcogen nitride 1,5-Se2S2N4 hasbeen prepared in high yield by two different reactions: (a) from [(Me3S i)2N]2S and SeCl4 and (b) from [(Me3Si)2N]2Se with equimolar amounts of SCl2 and SO2Cl2. 1,5-Se2S2N4 has a cage structure similar to those of S4N4 and Se4N4. The crystal structure is disordered with site occupation factors ca. 50% for selenium in each chalcogen atom position. The 12 eV EI mass spectrum shows Se2SN2(+) as the fragment with highest mass. Both the (14)N and (77)Se NMR spectra show a single resonance (-238 and 1418 ppm, respectively). These data rule out the possibility that the crystalline sample is a solid solution of S4N4 and Se4N4 and imply the presenceof 1,5-Se2S2N4. This deduction was further verified by Raman spectrosco py and vibrational analysis.
