Pb compounds

Cd/Cd compounds carbon tetrachloride chloroform Cr/Cr compounds CN-compounds /HCN Pb/Pb compounds Hg/Hg compounds methylene chloride methyl ethyl ketone methyl isobutyl ketone Ni/Ni compounds tetrachloroethylene toluene... 

Most oxoacid derivatives of lead are Pb" compounds, though Pb(OAc)4 is well known and is extensively used as a selective oxidizing agent in organic chemistry.It can be obtained as... 

There has been growing interest in the detailed structure and reaction chemistry of monomeric forms of two-coordinate derivatives of Ge , Sn and Pb" since the first examples were unequivocally established in 1980. Thus, treatment of the corresponding chlorides MCI2 with lithium di-tert-butyl phenoxide derivatives in thf affords a series of yellow (Ge , Sn ) and red (Pb ) compounds M(OAr)2 in high yield.The O-M-O bond angle in M(OC6H2Me-4-Bu2-2,6)2 was 92° for Ge and 89° for Sn. Similar reactions... 

Another unusual organo-Pb compound is the complex [Pb (AlCl4)2(r) -C6H6)].-... 

Three-way automotive catalysts based on palladium, rather than the more expensive metals platinum and rhodium, have long been desired. However, Pd is more sensitive than R to poisoning by lead (Pb) compounds [1-4], Consequently, widespread commercial use of Pd-based automotive three-way catalysts (TWC) was delayed in the U.S. until the early 1990s, by which time residual Pb concentrations in unleaded gasoline had decreased to negligible levels. The past five years have witnessed... 

Methylation of [Co(tmt)]2+ with Mel leads to the potent methyl carbanion donor trans-[Co(tmt)Me2]+ (186). Reaction of this complex with variety of methyl-lead(IV) compounds in MeCN is rapid, leading to the same monomethylcobalt(III) product, but resulting in different methylated Pb derivatives depending on the reaction stoichiometry and Pb compound.839 The same complex rapidly transfers Me groups to Zn2+ and Cd2+ in MeCN,840 or Pb2+ and Sn2+ in water.302,841 The kinetics of Co—C bond formation in the reactions with primary alkyl and substituted primary alkyl radicals has been found to be influenced more by the structure of the macrocycle than by the nature of the radicals.842... 

The complexes exhibited different behavior in solution. The gold-thallium derivative showed a shift of the emission to 536 nm when the measurement was carried out in frozen solution. This was explained by a higher aggregation of [Aull(MTP)2] units in the solid state compared to the situation in solution. In the case of the Au-Pb compound, the emission spectrum showed a strong dependence on the aggregation state and temperature. Thus, the emission band in TH F solution, which appeared at 555 nm (298 K) (x = 57 ns), was shifted to 480 nm in frozen solution (x = 2.3 ps) or appeared at 752 nm in solid state (x = 22 ns). As with the thallium complex, the shift to high energy in solution may have been related to the polymeric structure of the complex in the solid state that was not reproduced in solution. 

Microwave-induced plasma optical emission spectrometry (MIP-OES) is very sensitive for volatile species containing metals. Hence its use has been also proposed as a detector in the development of hyphenated techniques for speciation. GC MIP-OES has been successfully applied for the speciation of alkylmetal species of low molecular weight (Hg, Sn and Pb compounds) in many different environmental applications [23]. 

The CH(F)=XH2 series has planar equilibrium structures for X = C and Si, while for X = Ge, Si and Pb the optimized fraws-bent geometry is more stable (Table 2). The planar forms for the last three X atoms are calculated to be 0.3, 2.3 and 5.4 kcalmol-1 higher in energy than the respective fraws-bent forms. DFT/CEP-5ZP calculations using the B3LYP functional do not show stationary states in the planar geometry for the Sn and Pb compounds, while, as noted above, at the ab initio CAS(4,4)/CEP-DZP level... 

Since the submission of this manuscript some papers related to the ambiphilic phosphine-boranes appeared in the literature. We have reported the preparation of the PB compound Ph2P-(l,l -ferrocenyl)-BMes2 featuring a... 

---