Selenides 79 coordination complexes

Reaction between the palladium pincer complex 115 and trimethylstannylphenylselenide 116 is assumed to result in formation of a phenyl selenide-coordinated complex 117 (Equation 24) <2005JOC9215>. 

Phosphine complexes, osmium, 19 642 Phosphine coordination complexes, of uranium, 25 436 Phosphine derivatives, 19 28 Phosphine oxide(s), 11 495-496 19 66 predicted deviations from Raoult s law based on hydrogen-bonding interactions, 8 814t in salicylic acid manufacture, 22 8 Phosphine oxide diols/triols, 11 501 Phosphine selenides, 22 90 Phosphinic acid, 19 20, 54-55 Phosphinic anhydride, 11 499 Phosphinothricin acetyltransferase (PAT) proteins, 13 360 Phosphite esters, 19 20 Phosphites, in VDC polymer stabilization, 25 720... 

Draganjac M, Rauchfuss TB (1985) Transition metal polysulfides Coordination compounds with purely inorganic chelate ligands. Angew Chem Int Ed Engl 24 742-757 DuBois MR (1989) Catalytic applications of transition metal complexes. Chem Rev 89 1-9 Ansari MA, Ibers JA (1990) Soluble selenides and tellurides. Coord Chem Rev 100 223-266... 

The boron atom has tetrahedral coordination in pyridine complexes of 1,3,2,5-dioxaboraphosphorinane sulfides and selenides. These compounds exist as a mixture of conformers and stereoisomers [Eq. (86)]. In some cases it appeared possible to isolate three individual stereoisomers of one substance. The chemical shift in 31P NMR spectra was shown to be stereospecific. 

As the chelate selenide complexes reacted with -toluidine mainly by displacing the coordinated olefinic group from the metal, Goodall assumed that they were more stable than the sulphur analogues. 

Two factors combine to lend a greater diversity in the stereochemistries exhibited by bivalent germanium, tin and lead compounds, the increased radius of Mn compared with that of Mw and the presence of a non-bonding pair of electrons. When the non-bonding pair of electrons occupies the isotropic valence level s orbital, as in, for example, the complex cations Pb[SC(NH2)2]6+ and Pb[antipyrine]6+, or when they are donated to conductance band levels, as in the binary tin and lead selenides or tellurides or the perovskite ternary phases CsMX3 (M = Sn, Pb X = Cl, Br, I), then the metal coordination is regular. However, in the majority of compounds an apparent vacancy in the coordination sphere of the metal is observed, which is usually ascribed to the presence of the non-bonding pair of electrons in a hybrid orbital and cited as evidence for a stereochemically active lone pair . 

The telluroformaldehyde complex 57 was obtained by a PMe3-catalyzed insertion of Te into the methylidene unit of 56 [Eq. (12)],84 and the seleno-formaldehyde complex 59 was formed when the selenide 58 was treated with MeLi [Eq. (13)]. The different synthetic paths led to a different coordination mode of the heteroformaldehyde ligands.183... 

A number of metal complexes with bidentate phosphine selenide ligands, e.g. Ph2P(Se)(CH2) -P(Se)Ph2 (k = 1 or 2), have been reported but, unlike the monodentate phosphine selenides, have yet to be successfully characterized by X-ray crystallography. The coordination of selenium in these types of ligands is amenable to examination by inspection of the vPS vibration in the IR spectra.29,30... 

The situation with complexes of o-selenide ligands 491, even though such compounds are supposedly well known, is still unclear [636]. The structural details of coordination compounds of phenoselenoazine 492 have not yet been studied in detail [636] ... 

A similar exchange reaction produced the 1 1 complexes of phenyl tellurium thiocyanate with ethylenethiourea1, when the phenyl tellurium chloride complex was treated with potassium thiocyanate in aqueous methanol. However, the phenyl tellurium chloride -selenourea adduct and potassium selenocyanate yielded bis[phenyIteUuro] selenium3. Phosphane selenides also coordinate to phenyl tellurium halides3. 

Decomposition of single molecular precursors provides convenient and effective routes for the synthesis of metal chalcogenide nanocrystais. In this method, a molecular complex consisting of both the metal and the chalcogen is thermally decomposed in a coordinating solvent. For example dithiocarbamates and diseleno-carbamates have been found to be good air stable precursors for sulfides and selenides of Cd, Zn and Pb. Nanocrystais of Cd, Hg, Mn, Pb, Cu, and Zn sulfides have been obtained by thermal decomposition of metal hexadecylxanthates in hexadecylamine... 

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