Recent developments in the chemistry of stable doubly bonded germanium compounds

The nature of the C–As bonds in arsaalkynes: an atoms in molecules and electron localization function study

“…Consequently, the vibrational stretching frequency of the C:As bond in tBuCAs (1451 cm -1 ) is lower than that of the computed C:P bond stretch in tBuCP (1573 cm -1 [22]). The optimized structure of anionic [(CF 3 ) 3 BCAs] -((5) in Fig. 1) has much in common with the geometry of species (4).…”

“…The strong inductive effect of the electronegative CF 3 groups provokes a depopulation of the V(C,As) basin. In [(CF 3 ) 3 BCAs] -, the boron atom in engaged in four covalent bonds with four different carbon atoms, as evidenced by the presence of four disynaptic V(C,B) valence basins with electron populations of between 2.20 and 2.37 e -. The contribution of boron to these valence populations is of only 13%.…”

“…The chemistry of multiple bond compounds between group 14 elements and heavier pnictogen atoms has been the subject of substantial study [1][2][3][4][5][6][7][8][9]. These species are interesting from the synthetic point of view, because of the possibility of obtaining new ligands in coordination chemistry or good precursors in material chemistry.…”

“…Treatment of a platinum complex with Mes*C:As resulted in the synthesis of an arsaalkyne-transition metal complex Pt(PPh 3 ) 2 {g 2 :AsCMes*} that was structurally characterized by X-ray spectroscopy [14] together with the same arsaalkyne Mes*C:As ligand. More recently, an unexpectedly stable C:As anionic compound, [(CF 3 ) 3 BCAs] -, was synthesized and characterized together with its lighter congener [(CF 3 ) 3 BCP] - [15]. Thermally unstable Me-C:As decomposes well below room temperature [16]; the parent methylidynearsine HC:As, the third known unsubstitued heteroalkyne, was only very recently synthesized and characterized by mass spectrometry and UV-photoelectron spectroscopy [17].…”

What is the structure of Si3H5-?

“…So, what is the most stable structure of Si 3 H À 5 ? In general it is perceived that unsaturation is strongly disfavored for silicon species; however, many examples now exist (as do their Ge, Sn and Pb analogs) [18][19][20][21][22][23]. Furthermore, these examples of multiple bonded species illustrate a pervasive non-planarity in direct opposition to their carbon analogs.…”