Self-assembly in organolead compounds

Compared with organotin compounds, organolead organometallics have been much less investigated by X-ray dil action. There are, however, some well documented examples of supramolecular self-organization in organolead chemistry. 

Diphenyllead dichloride, Ph2PbCl2, is associated in doubly bridged chains, 134 (Pb-Cl 2.795 A) and the metal is six-coordinate (distorted octahedral geometry). The phenyl groups are perpendicular to the plane containing the Pb and Cl atoms [341]. 

Dimeric association through Pb- - -Cl secondary bonds has been found in ClPb[C(SiMe3)2CPhNSiMe3] (primary Pb-Cl 2.609 A, secondary Pb- - -Cl 3.276 A) 

Cryoscopic measurements suggest that (l,3-di-mrr-butylcyclopentadienyl)lead(II) tetrafluoroborate, (j7 -Bu 2C5H3)2Pb[BF4], is associated as a cyclic trimer, 136 

Triptycene fonns [(C2oHi4)Pb(AlCl4)2-0.5C6H6] which also has a supramolecular structure [347]. 

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