Azulene-1-carboxylate - A new azulene-based building block for coordination polymers

摘要

For the first time, the easily accessible azulene-l-carboxylate anion has been employed as building block for the construction of crystalline coordination polymers. Neutralization of azulene-l-carboxylic acid (3) with NaOH in aqueous solution provided the dark purple sodium salt C10H7CO2Na center dot H2O (4) in 85% isolated yield. Single-crystal X-ray diffraction of 4 revealed a supramolecular layer structure in the crystalline state. Subsequent treatment of 4 with 1 equiv. of Me3SnCl afforded a rare organotin derivative of azulene, namely polymeric [C10H7CO2SnMe3](n) (5) as purple crystals (82% yield).