NaSeC₂H: A Crystalline Compound with Disordered ^–SeC₂H Anions

Abstract

By reaction of NaC 2 H with elemental selenium (grey or red) in liquid ammonia a crystalline brownish powder of NaSeC 2 H was obtained. The existence of the new-SeC 2 H anion-recently discovered in A I SeC 2 H (A I = K, Rb, Cs)-was confirmed by IR spectra showing the expected CϵC, C-H, and C-Se vibrations. A synchrotron powder diffraction pattern (SNBL, ESRF/Grenoble) was indexed in a cubic unit cell with a = 7.044 Å.

Make Selenium Reactive Again: Activating Elemental Selenium for Synthesis of Metal Selenides Ranging from Nanocrystals to Large Single Crystals

“…Both signals are correlated to 1 H sites with chemical shifts of 1.6 and 2.7 ppm, which again agrees with the values measured by Amosova et al on H 3 C–CH 2 –Se–CH 2 –CH 2 –NH 2 , and, as such, both species are likely aminoethyl mono- and diselenides. The presence of a C–Se–C Raman bending mode (Figure c) and a C–Se IR stretch (Figure d) provides further support to these assignments . The formation of these species under the current reaction conditions is highly promising, as diorganyl selenides and diselenides are essential Se precursors for the synthesis of colloidal semiconductor nanocrystals and polymorph-tunable transition metal diselenides. − …”

“…77 Se NMR spectra of the 2c) and a C−Se IR stretch (Figure 2d) provides further support to these assignments. 60 The formation of these species under the current reaction conditions is highly promising, as diorganyl selenides and diselenides are essential Se precursors for the synthesis of colloidal semiconductor nanocrystals and polymorph-tunable transition metal diselenides. 61−63 Of the three remaining minor species, the resonance at 89 ppm most likely originates from HO−CH 2 −CH 2 −Se−CH 2 − CH 2 −OH, which has a reported 77 Se chemical shift of 85 ppm.…”