摘要:
It has been recognised recently that C–H⋯π interactions involving multiple aryl groups can be an important factor in determining solid state structures.1Dance and Scudder have shown that these interactions, which they denote as multiple phenyl embraces, can occur in triphenylphosphine complexes,2and in addition to linking individual molecules together they can form the basis of extended networks such as hexagonal arrays.3Although the energy of a single C–H⋯π interaction is small, calculations show that the energy of a sixfold phenyl embrace (6PE) can be as high as 11.3 kcal mol−1.2Recently, we have become interested inNpyrrolyl phosphine ligands,4in part due to the strong πacceptor character of these ligands which ensures they are excellent electronwithdrawing ligands.5In this paper, the Cambridge Structural Database (CSD)6is used to investigate the size and conformation ofNpyrrolyl phosphines, and to determine whether theNpyrrolyl groups can act in a similar manner to phenyl groups in forming supramolecular interactions.
ISSN:1466-8033
DOI:10.1039/b108813k
出版商:RSC
年代:2001
数据来源: RSC