Selenium clusters

Isolated tellurium clusters 48-50 (Tex n = 7-9) were produced in a supersonic molecular beam and their vacuum-UV-photoelectron spectra were recorded at a photon energy of hv = 8.3 eV by a photoionization-photoelectron-photoion triple coincidence method. The trimer and tetramer were obtained as stable species in the tellurium cluster beam, unlike sulfur and selenium. The spectra of the odd-membered tellurium clusters have a tendency to be split and broadened, in contrast to those of the seven-membered clusters. For the clusters with n > 5, the spectra of tellurium clusters are similar to those of selenium counterparts, which may suggest a resemblance to the geometric structures between small tellurium and selenium clusters (see Chapters 14.09 and 14.10) <2002MI337>. A similiar study has been conducted by Curtiss and co-workers on selenium clusters <1998CPL(287)282>. 

The selenium clusters [Mo38e7X6] were obtained by reaction of [ M03 807X4 ] with X in the same way as their sulfur analogues. Complexes containing... 

K. Uehara, M. Ishitobi, T. Oda, and Y. Hiwatari, First-principle molecular dynamics calculation of selenium clusters. Mol. Simul., 18 (1997), 385-394. 

Molecular dynamics calculations have been made on the motions of the Na+ ion in mordenite zeolites.9 Selenium clusters doped with Na (i.e. Na2Sen) show a Raman band in the range 165-225 cm 1 due to Na-Se motions.10 Raman microspectra have been reported for caesium oxides, e.g. an alg mode of Cs20 was seen at 103 cm 1.11... 

Tetranuclear Iron-Sulfur and Iron-Selenium Clusters 33... 

Table 26.3 (continued) BDEs in Selenium Clusters/Complexes... 

Se-O bonds, 452 Se-P bonds, 452 Se-S bonds, 452 Se-Se bonds, 451 Se-Te bonds, 452 Selenium clusters/complexes anions, 1346 cations, 1341-1346 neutrals, 1341 Si-containing compounds C-H bonds, 100, 131, 133 C-O bonds, 344 N-C bonds, 418 N-H bonds, 377 O-H bonds, 261, 304 0-0 bonds, 315 Si-Br bonds, 465 Si-C bonds, 460-462 Si-Cl bonds, 464-465 Si-F bonds, 463 -464 Si-Ge bonds, 467 Si-H bonds, 455-459 Si-1 bonds, 465 Si-Mn bonds, 467 Si-N bonds, 463 Si-O bonds, 462-463 Si-P bonds, 466 Si-S bonds, 466 Si-Se bonds, 450,466 Si-Si bonds, 459-460 Si-Sn bonds, 467 Si-Te bonds, 466 Silicon neutral complexes anions, 1153 cations, 1147-1152 neutrals, 1140-1147 Sm-containing species neutrals, 623 -626 Sm clusters, 626 Sn-containing compounds 0-0 bonds, 315 Sn-Br bonds, 475-476 Sn-C bonds, 476-477 Sn-Cl bonds, 475 Sn-F bonds, 475 Sn-Ge bonds, 475 Sn-H bonds, 473-474 Sn-1 bonds, 476 Sn-O bonds, 477 Sn-Pb bonds, 475 Sn-S bonds, 477 Sn-Se bonds, 477 Sn-Si bonds, 467 Sn-Sn bonds, 474-475 Sn-Te bonds, 477 Sr-containing species neutrals, 591-593 Sr+ clusters, 593-595 Sulfates... 

A remarkable shift can be observed in the onset of absorption to higher wavelengths, by approximately 0.8 eV, with increasing cluster size (this is related to the increase in the number of copper and selenium cluster core atoms) in this narrow size regime, from approximately 600 nm (2.1 eV) for 1 (39 cluster core atoms) to... 

The approach of using RE-TMS reagents is readily adaptable to introduce specific chemical functionality in R, and has thus been extended to the synthesis of ternary CuHg E nanoclusters via the use of silylated copperchalcogenolate complexes, [(L)3Cu(E-TMS)] (E = S, Se, Te L = PPr", PEts) (Figure 3) as soluble delivery agents of CuE (Equation (IQ). Silylated ferro-cenyl-selenolate reagents have also been used to introduce redox-active ferrocene units onto copper selenium cluster cores (Equation (17)) ... 

Table 10 Copper selenium clusters synthesized using silylated chalcogen reagents.

Becker J, Rademann K, Hensel F (1991) Ultraviolet photoelectron studies of the molecules Ses, See, Sev and Seg with relevance to their geometrical structure. Z Phys 019 229-231 TriboUet B, Benamar A, Rayane D, Broyer PM (1993) Experimental studies on selenium cluster structures. Z Phys 026 352-354... 

Brechignac C, Cahuzac Ph, KebaUi N, Leygnier J (2000) Photothermodissociation of selenium clusters. J Chem Phys 112 10197-10203... 

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