Synthesis and characterization of the unstable primary amido tin(ii) dimer Sn2{N(H)Dipp}4 (Dipp = C6H3-2,6-Pri2) and the first sesqui-amido hemi-chloride derivative Sn2{N(H)Dipp}3Cl: facile conversion of a primary amide to the imide (SnNDipp)4

Abstract

The primary tin(ii) amido derivatives Sn(2){N(H)Dipp}(4) () and Sn(2){N(H)Dipp}(3)Cl () (Dipp = C(6)H(3)-2,6-Pr(i)(2)) have been prepared and characterized. Compound was obtained by the transamination of Sn{N(SiMe(3))(2)}(2) with H(2)NDipp in a 1 : 2 ratio or by the reaction of two equivalents of LiN(H)Dipp with SnCl(2). The attempted preparation of Sn(Cl){N(H)Dipp} by reaction of LiN(H)Dipp with SnCl(2) in a 1 : 1 ratio led to the isolation of the unique species Sn(2){N(H)Dipp}(3)Cl, which is the first example of a sesqui-amido derivative of a group 14 element. Both and were characterized by (1)H and (119)Sn NMR spectroscopy, X-ray crystallography and Mössbauer spectroscopy. The structures of and feature two tin centers bridged by -N(H)Dipp ligands with the terminal positions being occupied by two N(H)Dipp () or -N(H)Dipp and -Cl () groups. The compound was found to be unstable under ambient conditions and spontaneously converts to the imide tetramer (SnNDipp)(4) in solution over several days at room temperature, representing a new synthetic route to group 14 element imides.

Iron and tin atom dynamics and hyperfine interactions of two structurally related half-sandwich complexes bearing a distannyl moiety

“…rapidly transferred to O-ring sealed sample holders, which in turn were immediately cooled to liquid nitrogen temperature until introduced into the pre-cooled ME cryostat. ME spectroscopy was carried out as described previously [10] in transmission geometry, using a Ca 119m SnO 3 source at room temperature. All IS are reported with respect to a room temperature BaSnO 3 absorber spectrum, and spectrometer calibration was effected using an a-Fe foil at room temperature.…”

Sn6[P12N24] – A Sodalite‐Type Nitridophosphate

“…The 119 Sn spectrum ( Figure 4) shows a main spectral component (97 %, blue line) at an isomer shift of δ = 3.05(1) mm s -1 , which is compatible with divalent Sn. [47] The Sn II signal is subjected to quadrupole splitting of ΔE Q = 1.58(1) mm s -1 , a consequence of the Sn lone pair. The isomer shifts of Sn II -N coordination compounds are in a similar range.…”

Synthesis and reactivity of tin amide complexes

“…3, Table 2). The latter is slightly shorter than the terminal anilide tin complex, {(MA-NH)Sn-(l-HN-MA) 2 LiÁ2THF} (MA = 2-MeO-C 6 H 4 ) of 2.118(8) Å and the terminal anilide ligands of Sn 2 {N(H)Ar} 4 (Ar = 2,6-iPr 2 C 6 H 3 ) (2.117(3) and 2.120(4) Å) [14,15]. An endo configuration of the complex is found, presumably due to smaller bulk at the N-aryl nitrogen relative to the amide ligand of 2.…”