Structural and Electronic Properties of Low-Dimensional C-Nanoassemblies and Possible Analogues for Si (and Ge)

Table 1

Bond-lengths for different Si-structures (Å)*. Note that for the Si=Si double bond lengths of disilenes vary between 2.14 and 2.29 Å and are nearly 5 to 10% shorter than the Si–Si single bond lengths of corresponding disilanes. This rate of bond shortening is less than 13% in carbon compounds [57].

Si-bulk [59]	2.35
Si2 (en silicon-carbene-complex) [60]	2.2294 ± 0.0011
Si-nanowire (H-terminated) [57]	2.34 to 2.36
nanocrystal: Si87H76 [57]	2.35
Si6H6 Si-H [6]*	1.47

*Compare 1.07 Å for C–H length in benzene, which is the same as in the CH radical itself.