Figure 2: Structure of organic linkers.
From: Molecular weaving via surface-templated epitaxy of crystalline coordination networks.

(a) Chemical structure of quadritopic (4t) organic linker BAB-TPDC (bis(acetylene-biphenyl)-terphenyl di carboxylic acid). (b) Chemical structure of the ditopic linker BMB-TPDC (bis(methyl-biphenyl)-terphenyl di carboxylic acid). (c) Solid state structure of BAB-TPDC determined by X-ray crystallography (ellipsoids plotted at a 50% probability level).