E. Weber et al., A REMARKABLY BENT ALLENE - X-RAY CRYSTAL-STRUCTURE AND AB-INITIO CALCULATIONS, Journal of physical organic chemistry, 8(2), 1995, pp. 94-96
X-ray data on the crystal and molecular structure of bis(biphenyl-2,2'
-diyl)allene, reveal a remarkably strong deviation from linearity (170
.1 degrees) of the allene unit of the molecule. Ab initio calculations
involving dimers of molecules yield good correlation with this geomet
ry, showing that the non linearity is due to packing effects in the cr
ystal.