Dimeric antimony complexes capturing dimethylamine as a neutral donor; syntheses and structural characterisation of [SbCl₂(NHMe₂)(µ-OEt)]₂and [SbCl(NHMe₂)(µ-NBu^t)]₂

Abstract

The two dimeric antimony complexes, [SbCI,(NHMe,)(p-OEt)], and [SbCI(NHMe,) (p-NBu')], have been synthesised by the reaction of SbCI,(NMe,),-, with EtOH ( x = 2) or NH,But ( x = 1 ) respectively; both complexes exhibit the co-ordination of a dimethylamine ligand to antimony and intricate intermolecular association in the solid state.

Covalent Co–O–V and Sb–N Bonds Enable Polyoxovanadate Charge Control

“…28 Very short Sb–N bonds of 2.018 and 2.028 Å were observed for [SbCl(NHMe 2 )(μ-NBu t )], while a medium-long Sb–N bond is present in [SbCl 2 (NHMe 2 )(μ-OEt)] 2 (2.402 Å). 29 Similar medium-long Sb–N distances (2.240 and 2.358 Å) were found for dichloro[ N (4)- o -fluorophenyl2-acetylpyridinethiosemicarbazonato]antimony(III). 30 While the Sb–N distance of 2.029 Å is treated as a covalent bond in [(η 1 -Me 2 SiNDipp)NHDippSbCl 2 ] (Dipp = 2,6-diisopropylphenyl), the authors proposed no bonding interaction for the Sb–N separation at 2.66 Å.…”

“…To have a better understanding about the Sb–N bonding situation in the title compound, we compared the Sb–N bonds in several different compounds [compound 1 , Sb(C 4 H 3 N 2 S) 3 · 1 / 2 CH 3 OH, 28 [SbCl 2 (NHMe 2 )(μ-OEt)] 2 , and [SbCl(NHMe 2 )(μ-NBu t )] 29 ] because these cover all of the ranges of the Sb–N distances mentioned in the present contribution (see Table 1). The results demonstrate that the bonding between Sb and N atoms is covalent, and it is governed by electron-exchange and donor–acceptor mechanisms.…”

Neutral and anionic aryloxy halides of bismuth(III)

“…(µ-OEt) 2 ] has been reported by Wright and co-workers. 24 The structure of [Sb 2 Cl 4 (NHMe 2 ) 2 (µ-OEt) 2 ] is dimeric with OEt groups which bridge slightly more asymmetrically than do the bridging aryloxy groups in 1 and 2 [Sb-O 2.005(4) and 2.478(4) Å]. The coordination sphere of each antimony is completed by two chlorine atoms and one NHMe 2 ligand such that the overall geometry is square-based pyramidal.…”

Structure and reactivity of [{Te(NMe2)2}∞]; application to the preparation of metalloorganic tellurium(II) compounds

“…Our studies into heavy p-block metal-nitrogen bonded complexes have recently focused on the applications of the dimethylamidometal reagents as potent bases. 3 The condensation reactions of these reagents with primary amines [NH,R] or lithiated primary amines LiCNHR] has proved to be a highly versatile and general strategy to lowoxidation-state Group 14 (Sn) and 15 metal (Sb, Bi) amido and imido derivatives. However, the extension of this work to Group 16 (Se, Te) had been thwarted by a lack of suitably reactive and readily prepared deprotonation reagents.…”