Table 2. Bond Lengths (Å) for Selected Poly-C,Si,Ge-acenes.

n	C	Si	Ge
This Work
1	1.39	2.23	2.36
6 (outer ring)	1.36–1.45	2.21–2.27	2.33–2.40
6 (inner ring)	1.40–1.45	2.25–2.30	2.38–2.42
Silo-benzene
125		2.23
2D and 3D Lattices
2D lattice6	1.42	2.24	2.34
2D lattice (exp)41	1.54 (diamond)	2.35	2.45
H-Saturated Nanoribbons
AXNR-930		∼2.21–2.26	∼2.32–2.38
AGeNR-933			∼2.4
7-ASiNR30		2.22–2.32