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a. Bond lengths and angles

Bond lengths in Å. C--C 1.54, C=C 1.34, C$\equiv$C 1.20, C--C aromatic 1.39, C--O 1.43, C=O 1.23, carboxylic acid 1.30, 1.20, carboxylate 1.26, C--N 1.47, C--N in heterocycles 1.35, C--H 1.09, C--S 1.81, C=S 1.71. Tetrahedral angles sp³ 109.5. Trigonal angles sp² 120.0$^{\circ}$. Linear bonds sp 180.0$^{\circ}$. Octahedral coordination 90$^{\circ}$.

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