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Isoelectronic cluster

Carbon is known with all coordination numbers from 0 to 8 though compounds in which it is 3- or 4-coordinate are the most numerous. Some typical examples are summarized in the Panel (p. 291). Particular mention should also be made of hypercoordinate non-classical carbo-nium ions such as 5-coordinate CHj", square pyramidal CsHs (cf. the isoelectronic cluster B3H9, p. 154), pentagonal pyramidal C6Me6 " (cf. iso-electronic Bf,Hio, p. 154) and the bicyclic cation 2-norbomyl, C7H] 1... [Pg.290]

X-ray diffraction, which showed that the structure of the [Tc2Cl8]2 ions is analogous to that of the isoelectronic cluster rhenium and molybdenum chlorides and bromides with a quadruple M-M bond [1,89,90] (Fig. la, Table 1). [Pg.205]

If there is only one atom shared between two clusters (an unknown situation for B) then o = l. Thus, [(R2C2B4H4)2E], E = Ga , Ge, (Figure 2.19) exhibits a structure consisting of two pentagonal pyramids fused at one apical vertex occupied by the atom E. There are 16 pairs in the isoelectronic clusters (2 R2C2B4H4 fragments = 14 pairs + E = 2 pairs) and m + + o = 2 + 13- -l = 16. The need for parameter o is discussed in the Jemmis article in the reading list. [Pg.62]

Related work proved the presence and determined the source of the interstitial nitride in the isoelectronic cluster [Rh6N(CO)i5] , and the facile interconversion of the trigonal prismatic and octahedral clusters (Equation 3). ... [Pg.92]

The structures of [Mo(CO)4(AuPPh3)5]+ " and [Mo(CO)3(AuPPh3)7]+ are shown in Fig. 5. The structure of [Mo(CO)5(AuPPh3)3]+ was not determined. It can, however, be assumed that it has the same structure as the isoelectronic cluster V(CO)5(AuPPh3)3.f Flomonuclear gold cluster compounds are always formed as by-products, but the amount can be reduced by using an excess of the metal carbonyl complex. [Pg.41]

It is interesting to note that cluster stability is reduced if Au is substituted by Cu, forming the hypothetical isoelectronic cluster compound [(R3PCu)6C] +. Most... [Pg.1420]


See other pages where Isoelectronic cluster is mentioned: [Pg.12]    [Pg.391]    [Pg.254]    [Pg.228]    [Pg.233]    [Pg.4]    [Pg.579]    [Pg.7]    [Pg.411]    [Pg.981]    [Pg.34]    [Pg.105]    [Pg.91]    [Pg.116]    [Pg.117]    [Pg.187]    [Pg.60]   
See also in sourсe #XX -- [ Pg.218 , Pg.219 , Pg.220 , Pg.221 , Pg.222 , Pg.223 , Pg.224 , Pg.225 , Pg.226 , Pg.227 , Pg.228 , Pg.229 , Pg.230 , Pg.231 , Pg.232 , Pg.233 , Pg.234 ]




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