Phosphine selenides synthesis

Koh and co-workers have used tris(diethylamino)phosphine selenide (TDPSe) as a new source for selenium instead of the commonly used TOPSe for the synthesis of PbSe nanorods (NRs) by colloidal method (Fig. 9). The new phosphine selenide precursor (TDPSe) in tris(diethylamino)phos-phine (TDP) was rapidly injected to a mixture of PbO, OA in ODE at 170 °C to produce monodisperse single-crystalline PbSe NRs of ca. 4nm diameter with length of ca. 40 nm. The growth mechanism of the NRs was possibly by oriented attachment in addition to the Ostwald ripening process. These NRs showed absorption and emission peaks at 1360 and 1440 nm compared to the spherical PbSe NCs absorption and emission at 1375 and 1420nm respectively. The QY of the NRs was found to be 15 % which is close to the reported QY (20-40 %) of spherical PbSe NCs and notably high. 

The reaction of triphenylphosphine with potassium selenocy-anate rapidly produces quite pure material in almost quantitative yield. The procedure outlined below is simple and appears to be particularly advantageous for preparation of selenide derivatives of solid phosphines. J Actual working time required for the synthesis is 1-J- to 2 hours, and the total elapsed time is less than 1 day. 

Emrick and Coughlin et al. reported on the synthesis of cadmium selenide-polymer composites. A vinylbenzyl-derivatized phosphine oxide was ph-ysisorbed onto cadmium selenide particles. Subsequent reaction with RUCI2 (PCy3)2(CHPh) or RuCl2(NHC)(PCy3)(CHPh) (NHC= 1,3-dimesityhmidazol-2-ylidene) followed by addition of cyclooctene, 7-oxanorborn-5-ene-2,3-dicarboxylic anhydride, dicyclopentadiene or N-methyl-7-oxanorborn-5-... 

Facile synthesis of macrocycles 234 and 235 containing a phosphine oxide group and selenium atoms was recently developed <2001J(P1)1140>. Pulverized Se(0) was reduced with KBH4 in absolute alcohol to produce a mixture of potassium selenide and potassium diselenide, which reacted with 232 to give a mixture of diselenaphosphoninone 235 and selenaphosphocinone 234. 

A new one-pot method has been developed by Kraszewski for the synthesis of aryl nucleoside phosphate (3a-p) and phosphorothioate (4a-p) diesters. This method, based on H-phosphonate chemistry, employed diphenyl phosphoroch-loridate and a series of phenols. Depending on the substituents present on the phenols, oxidation conditions were optimized to avoid competing hydrolysis. A versatile procedure that permits easy access to H-phosphonoselenoate monoesters (5) has been developed by Stawinski. These monoesters, obtained by selenisation of a phosphinate using triphenylphosphine selenide in combination with trimethylsilyl chloride, reacted with a suitable nucleoside in pyridine/acetonitrile in the presence of diphenyl phosphorochloridate to yield... 

Several sulfenyl group sources are also known [60,61]. Diphenyl selenide was reported [52]. Diphenylphosphorus chloride was used extensively in the synthesis of new phosphines [38,47,51,62]. A chiral version is shown in Eq. (6) [51]. 

This approach of using a combination of RSe-TMS and Se(TMS)2 for cluster synthesis should allow for the tailored functionalization of semiconductor nanoparticles. Recently, the ability to functionalize the surface of Cu2Se clusters has been demonstrated. The synthesis of l,l -bis(trimethyl-silyl)ferrocene, and its consequent reaction with CuOAc and excess phosphine has produced the polynuclear copper selenide cluster [Cug Fe(77 -C5H4Se)2 4(PPh2Et)4] (51) with surface redox-active ferrocene units that are intimately coupled to the cluster core (Figure 34). ... 

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