The bonding situation in triethylchalcogenostiboranes – polarized single bonds vs. double bonds

Abstract

Triethylchalcogenostiboranes Et3Sb[double bond, length as m-dash]E (E = S , Se ) were synthesized and their solid state structures were determined. The Sb-Se bond length is the shortest ever reported. Short SbE contacts were not observed. According to quantum chemical calculations, the bonding situation in and is best described as a polarized Sb-E single bond.

Synthesis of Binary Sb2E3 (E = S, Se) and Ternary Sb2(S,Se)3 Nanowires Using Tailor‐Made Single‐Source Precursors

“…(Et 2 Sb) 2 S ( 1 ) and (Et 2 Sb) 2 Se ( 2 )42 were synthesized by a slightly modified reaction as reported by Breunig et al43 and Et 3 SbS ( 3 ) and Et 3 SbSe ( 4 )39 were prepared by oxidative addition reaction of elemental sulfur and selenium to SbEt 3 ,44,45 (Scheme ).…”

Covalently bonded compounds of heavy group 15/16 elements – Synthesis, structure and potential application in material sciences

“…19), which were obtained from the oxidative addition of the respective elemental chalcogen to Et 3 Sb. [116] The Sb atoms adopt slightly distorted tetrahedral coordination spheres. The Sb-S bond length of Et 3 SbS (2.381(7) Å), which is in between the calculated values for a Sb-S single bond (∑ cov (Sb,S) = 2.43 Å) [59] and a Sb=S double-bond (∑ cov (Sb,S) = 2.27 Å), [117] is significantly longer than that observed in Ph 3 Sb=S (2.244(1) Å).…”

“…[26] The compounds are monomeric in solution, as was shown by 1 (8)). [116] Moreover, the Sb-E bonds in the monomeric compounds ArSbE (E = Se, Te) and Ar'SbE (E = S, Se) are significantly shorter than the calculated Sb-E single bond values (∑ cov (Sb, E) 2.43 Å (E = S), 2.56 Å (E = Se), 2.93 Å (E = Te)), [59] but are only slightly enlarged compared to the calculated value of a Sb=E double bond (∑ cov (Sb, E) 2.27 Å( E = S), 2.40 Å (E = Se), 2.61 Å (E = Te)). [117] These structural findings point to either a high double-bonding character or a highly polarized single bond within these compounds.…”

“…Packing of Et 3 SbSe in the solid state. [116] The Sb-Se bond length (2.4062(8) Å) in Et 3 SbSe, the only structurally characterized trialkylselenostiborane, represents the shortest Sb-Se bond observed, to date. The bond is significantly shorter than the calculated value for a respective Sb-Se single bond (∑ cov (Sb,Se) = 2.56 Å) [59] and agrees perfectly with the calculated value of a Sb=Se double bond (∑ cov (Sb,Se) = 2.40 Å), respectively.…”

“…[3] Page 32 of 66 A c c e p t e d M a n u s c r i p t Table 6. Bond lengths (Å) and angles (°) of thio-and selenostiboranes Ph 3 SbS [31] Et 3 SbS [116] Et 3 SbSe [116] Sb (13) The …”