New vistas in the chemistry of platinum group metals with tellurium ligands

Chemistry inside a Porphyrin Skeleton: Platinacyclopentadiene from Tellurophene

“…Similar deformation is present in 5 and 6,w here platinum(II) ion acquiresadistorted square planar geometry.I na ll the structures the tellurium atom protrudes from the macrocycle mean plane,a st he tellurophene ring is significantly tilt from C 4meso -plane and the ring deflection is observed (side projections in Figure 1, Figures S27-S31), which may be attributed to the large size of tellurium donor atom and the propensity of organotellurium ligands to be coordinated by metal ions in a side-on fashion. [26,27] Typically,a na ngle between C-Te-C plane and PtÀTe bond for organotellurium platinum complexes is in range 1068-1138, [28] in special cases even lower (for ad itelluraisophlorin palladium complex, the analogousa ngle is 888 [29] ), while for presented platinatelluraporphyrins flattened by macrocycle constrains, it is significantly larger,r eaching 1328-1418 (Table S2), close to the corresponding angle in 21-pallada-23telluraporphyrin (1488). [17] Thus, the overall platinaporphyrins deformation is ar esultant of several antagonistic forces:t he tendency of platinum ions to square-planar or octahedral coordination geometry,t he tellurium donor coordination preferences, the size of core atoms, and finally,t he porphyrin skeleton constrains.…”

Reactivity of hemilabile pyridyl- and methyl-substituted pyrimidylselenolates with [MCl2(dppf)] (M = Pd, pt; dppf = bis(diphenylphisphino)ferrocene)

“…[8]. The latter mononuclear product has also been reported by an oxidative reaction between [Pt(dppf) 2 ] and bis(chloromethyl)disulfide [12][13][14] which decomposes to high nuclearity complex along with unidentified product in chlorinated solvents [15][16][17]. The facile transformation of bridging chalcogenolates to terminal one is predominantly due to high nucleophilicity of the complex which makes them highly susceptible towards attack on chlorinated solvent [8,16,18,19].…”

Bis(6-Diphenylphosphinoacenaphth-5-yl)Telluride as a Ligand toward Manganese and Rhenium Carbonyls

“…Transition metal complexes composed of multidentate ligands based upon tellurium are far less explored than those of sulfur and selenium, which might be due to the lack of easily available ligands containing tellurium, as well as the historical misconception that organotellurium compounds were extremely malodorous and toxic [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]. Up to the 1970s, studies of coordination chemistry were mostly restricted to monodentate ligands.…”