Ge-S single bond

Physical properties of 177131 parallel those previously mentioned for the germanimine 142 (stemming from the same germylene 140), particularly the formation of pairs of enantiomers in the solid state, an analogous marked shortening of the Ge=S distance [d Ge=S 2.090(2) A] in comparison to the common Ge-S single bond length (2.26 A), and the temperature dependence of the 1H NMR spectrum. 

The Compounds Between Si, Ge and Sn and Chalcogens (S, Se, and Te) Having Both a Single Bond and a Double Bond (Heavy Ketones)... 

The single-bond compounds between Si, Ge, and Sn and chalcogens (S, Se, Te) are reactive and used as synthetic intermediates in the synthesis of organic compounds, organochalcogen compounds, organo-silicon, -germanium and -tin compounds, and transition metal-chalcogen complexes and clusters. 

Two different routes were developed (a) chalcogenation of appropriate (transient) tetrylenes Tbt(Ar)E and (b) dechalcogenation of chalcogenametallolanes Tbt(R)EY4 (equation 15). Thus, several species with Ge=S, Ge=Se, Ge=Te or Sn=Se bonds were synthesized and structurally characterized so far (Table 16). All compounds have similar structures [see, for example, Tbt(Tip)Ge=Te (119)115,158 jn Figure 28] with E=Y multiple bonds much shorter (by ca 20 pm) than the respective single bonds the values from diffraction experiments match very well the calculated values (B3LYP) for the parent species H2E=Y164. 

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