A refinement of the crystal structure of tetraphenyl-lead

Redetermination of tetraphenyllead

“…The redetermination with diffractometer data corroborates the results of a prior study [Busetti, Mammi;Signor & del Pra (1967). Inorg.…”

“…Following earlier attempts to solve the crystal structure of (C6Hs)aPb (George, 1927;Giaeomello, 1938;Zhdanov & IsmailTade, 1949, 1950 a structure description of the tetrahedral molecule was given by Busetti, Mammi, Signor & del Pra (1967). In this paper only the position of a regular hexagonal phenyl ring (C--C 1.397 A) was varied systematically in order to find the lowest R value for 70 observed (h/c0) and 38 observed (h0/) film reflections recorded with a microdensitometer; the position of the crystallographically independent phenyl ring is described by four parameters: a = 55.…”

The crystal and molecular structures of hydroxotriphenyltin(IV) and hydroxotriphenyllead(IV)

“…Again the two metal-oxygen distances are unequal: they are however much longer than the Pb-O distance reported in PhaPbOSiPh3, 2.01 (3) ,/~ (Harrison, King, Richards & Phillips, 1976). The mean Pb-C distance found here is 2.18 (2) A: in Ph4Pb and Ph2PbCI z the corresponding distances are 2.19(3) A (Busetti, Mammi, Signor & Del Pra, 1967) and 2.12 (2) A (Mammi, Busetti & Del Pra, 1967). For Ph3PbOSiPh 3 (Harrison, King, Richards & Phillips, 1976) the Pb-C distances are reported as 2-06(4), 2.12(4) and 2.27 (4) A, with a mean of 2.15 (10) A, the large range possibly being ascribed to the partial disorder of the Si and Pb atoms.…”

“…The structures of both Ph3SnOH and Ph3PbOH consist of zigzag chains parallel to c in which Ph3M groups (M = Sn, Pb) planar at M are joined by OH groups, giving trigonal bipyramidal geometry at M; similar chains are observed in many R3SnX species, for example Me3SnF (Clark, O'Brien & Trotter, 1964), Me3SnOH (Kasai, Yasuda & Okawara, 1965), Me3SnCN (Schlemper & Britton, 1966), Me3SnOMe (Domingos & Sheldrick, 1974) and M%SnO2SMe (Sheldrick & Taylor, 1977): however, no oligomeric R3PbX compound appears to have been characterized previously, although Ph2PbCI 2 forms chains in which octahedral Pb atoms are linked by CI bridges (Mammi, Busetti & Del Pra, 1967). In PhaSnOH the two Sn-O distances, 2.197 (5) and 2.255 (5) A, are closely similar to those reported for Me3SnOMe, 2.20 (3) and 2.26 (3) /k (Domingos & Sheldrick, 1974), but significantly longer than the 1.94 (I)/k reported for monomeric (Me3Sn)20 (Vilkov & Tarasenko, 1969).…”

A refinement of the crystal structure of tetraphenylmethane: three independent redeterminations

“…Tetraphenylmethane is a member of an isostructural series which includes the compounds with Si,vGe, Sn and Pb as the central atom (Ismailzade & Zdanov, 1952;Busetti, Mammi, Signor & Del Pra, 1967;Chieh & Trotter, 1970;Glidewell & Sheldrick, 1971;Chieh, 1971Chieh, , 1972Karipides &Haller, 1972). Because of their relative simplicity, these structures have been the object of a theoretical calculation aimed at predicting both the intramolecular geometry and the intermolecular packing (Ahmed, Kitaigorodsky & Mirskaya, 1971).…”