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Thermally Induced Solid-state Z-E Isomerisation in Bi(cyclopentenylidene) Compounds. X-Ray Crystal Structure of (Z)-2,2'-Dioxo-3,3',4,4',5α,5'β-hexaphenyl-1,1'-bi(cyclopentenylidene)
Vyas, Krishnamurthi,Manohar, Hattikudur
, p. 1177 - 1180 (2007/10/02)
The crystal and molecular structure of the title compound has been determined; it crystallises as a methanol solvate in the space group P21/n with a=11.647(2), b=18.583(2), c=16.113(2) Angstroem, β=92.11(1)0 and Z=4.The structure has been solved by direct methods and refined to a final R value of 0.090.The molecular structure is different from that proposed earlier on the basis of spectral data.The central bond connecting the two five-membered rings displays pure double-bond character due to lack of conjugation.This is responsible for the thermal stability of the compound and the relatively high temperature for the isomerisation.One of the two five-membered rings assumes an envelope conformation and the other a half-chair.The solvent methanol molecule is disordered.
