The title compound, C(28)H(30)N(2), is a symmetrical 2:2 product from the condensation of indole and cyclo-hexa-none. It is the only reported 5,11-dihydro-indolo[3,2-b]carbazole compound in which the spiro atoms are quaternary C atoms. Crystals were grown by vapor diffusion in a three-zone electric furnace. The mol-ecule resides on a crystallographic inversion center. The cyclo-hexyl rings are in a slightly distorted chair conformation, whereas the indole units and the spiro-carbons are coplanar within 0.014 Å.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3254282 | PMC |
http://dx.doi.org/10.1107/S1600536811051208 | DOI Listing |
Acta Crystallogr C
October 2011
Department of Chemistry, University of Durham, South Road, Durham DH1 3LE, England.
The title compound, C(20)H(32)B(2)N(4), is monoclinic at ambient temperature but triclinic (pseudo-monoclinic) below 150 K. The structures of the two phases, determined at 200 and 120 K, respectively, are very similar, the molecular symmetry being crystallographic C(2) and approximate (local) C(2), respectively. There is significant π conjugation within each N-B-N moiety, but none between them or between the N-B-N and arene moieties.
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