Roof-shaped pyrazaboles as a structural motif for bent-core liquid crystals

3 pages, 4 figures, 1 scheme.-- Supporting information for this article is available: http://www.angewandte.org or from the author.-- See also: Angewandte Chemie International Edition 46(27): 5175-5177 (2007)Boron coordination compounds with a roof-shaped morphology (see structure) exhibit unusual liquid-crystalline behavior with a transition (represented by the red arrow) from a nematic mesophase with similar characteristics to those of some bent-core liquid crystals to a compact lamellar phase with a chiral organization (see microphotographs of the two phases).This research was supported financially by the MEC (Spain) and FEDER (EU) under the projects MAT2003-07806-C01 and MAT2006- 13571-CO2-01, as well as by the Ramón y Cajal program (R.G.), the FPU program (E.C.), and the Gobierno de Aragón.Peer reviewe