Synthesis and crystal structure of 2,9-di-amino-5,6,11,12-tetra-hydro-dibenzo[a,e]cyclo-octene.

The cis- form of di-amino-dibenzo-cyclo-octane (DADBCO, C16H18N2) is of inter-est as a negative coefficient of thermal expansion (CTE) material. The crystal structure was determined through single-crystal X-ray diffraction at 100 K and is presented herein.