Selenium halide complexes

Complexes of the sulfenamido anion [RSNR ] with several transition metals [Zr(IV), Ti(IV), Mo(VI), W(Vf), Ni(If), and U(IV)] are known.They are prepared by the reaction of the lithium derivative of the sulfenamido anion with a metal halide complex. A selenium complex W(N Bu)2( BuNSePh)2 has been obtained in a similar... 

Other selenium-containing complexes include the benzeneseleninato compounds [Ru(RC6H4-SeO,)3] and [Ru(RC6H4Se02)2X], (R = H p- and m-Cl, Br p-Me X = Cl, Br), whose IR spectra indicate O.O -seleninato coordination. The tris-complexes are octahedral and the bis are polymeric, octahedral with bridging halides.2279,2280 Reaction of [Ru(CO)3(PPh3)2] with (SeCN)2 affords [Ru(NCSe)2 (CO)2(PPh3 )2], 2281... 

Similar trans effect correlations have also been observed for related selenium and tellurium halide complexes by Knop and coworkers and by Krebs and Ahlers (19) a number of structural similarities between group 16 halides and halogenoanions are evident and these are mentioned where appropriate in the following section. 

Tellurium Halides. Tellurium forms the dihalides TeCl and TeBi, but not Tel2. However, it forms tetrahalides with all four halogens. Tellurium decafluoride [53214-07-6] and hexafluoride can also be prepared. No monohalide, Te2X2, is believed to exist. Tellurium does not form well-defined oxyhalides as do sulfur and selenium. The tellurium halides show varying tendencies to form complexes and addition compounds with nitrogen compounds such as ammonia, pyridine, simple and substituted thioureas and anilines, and ethylenediamine, as well as sulfur trioxide and the chlorides of other elements. 

Selenium hexafluoride, SeFg, the only clearly defined hexahalide, is formed by reaction of fluorine with molten selenium, It is more reactive than the corresponding sulfur compound, SFs, undergoing slow hydrolysis. Selenium forms tetrahalides with fluorine, chlorine, and bromine, and dihalides with chlorine and bromine. However, other halides can be found in complexes, e.g,. treatment of the pyridine complex of SeF/i in ether solution with HBr yields (py)2SeBrc Selenium tetrafluoride also forms complexes with metal fluorides, giving MSeF complexes with the alkali metals. 

NLO properties, 12, 128 organometallic complexes, 3, 318 as reaction materials, 3, 368 and selenium nucleophiles, 9, 471 surface chemistry on oxides, 12, 502 in triruthenium cyclopentadienyl clusters, 6, 799 trivalent halides, with metal carbonyl monoanions, 3, 347 Group 14 elements... 

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