Se₂NCl₃ and [Se₂NCl₂]⁺ [GaCl₄]⁻, Chloride Nitrides of Trivalent Selenium

Abstract

proline residues. The L-proline' multiplet can be separated easily by a transfer from pcis to /3"""s as shown in Figure 6 b.In order to excite only the pis proton of L-proline', magnetization was transferred from the strongly coupled pair p + 6"""" to the strongly coupled pair pcis + fra's. The resulting multiplet is represented in Figure 6 c and corresponds perfectly to the pattern in Figure 6a obtained by soft-COSY. I Qa 7 I Fig. 6. a) Multiplets obtained with normal soft-COSY of 1, centered at 6 = 1.60 in o, and b = 4.28 in wz.To the left, cross-peak correlating the p"""' proton (at 6 = 1.62) and the a proton (6 = 4.32) of L-proline*; to the right, cross-peak connecting the P" proton (6 = 1.58) and the a proton (6 = 4.23) of L-proline'. b) SPLIT-COSY multiplet of L-proline' alone obtained by injection of magnetization from P's (6 = 2.10) to B"""" via J(p"B""") = -12.8 Hz with T~, =78 ms. c) SPLIT-COSY multiplet of L-proline' alone obtained by injection of magnetization from the two nearly degenerate protons 6"' (6 = 3.52) and bL""" (6 = 3.57), with J(bCis6"""") = -11.7 Hz, to the two nearly degenerate and strongly coupled protons Y'""~ and (6 =1.61 and 1.58, with J(y''""'p"") = 3.4 Hz) via J(6c'y"'ns) = 3.1 Hz and J(6tr~"sy"""s) = 6.7 Hz. The cleanest in-phase magnetization was obtained for T~~, = 220 ms. In this case, the double irradiation period was followed by a hard purging pulse in order to remove antiphase terms [6]. Experimental conditions were the same as those for the spectra in Figure 3.Our new SPLIT-COSY technique allows one to separate overlapping multiplets in crowded parts of COSY spectra in order to extract hidden information. The structure of the resulting multiplets is the same as in soft-COSY, unlike the multiplets obtained in Selectively Znverted Soft COSY (SIS-COSY).r'51 In general, samples containing mixtures of isomers, which are likely to give overlapping cross-peaks, should become amenable to investigation, provided each isomer has at least one site with a distinct chemical shift. If necessary, several consecutive HOHAHA transfer steps may be used.

A Selenium‐Nitrogen Chain with Selenium in Different Oxidation States

“…For example, there is no selenium analogue of the six‐membered ring (NSCl) 3 , which is an important reagent in sulfur‐nitrogen chemistry , . Conversely, although the acyclic cations N( E Cl) 2 + are known for E = S and Se, the cation N(SeCl 2 ) 2 + and the anion N(SeCl 3 ) 2 – are unique chalcogen‐nitrogen species. This disparity is notably evident in the series of acyclic imidoselenium(II) chlorides ClSe[N( t Bu)Se] n Cl [ n = 1 ( 1 ), n = 2 ( 2 ), n = 3 ( 3 )], for which no sulfur counterparts are known.…”