Antimony coordination number

The antimony coordination number in phenyl oxydithia- and trithia-stibocane 103 and 104 is raised to four by a transannular interaction with either the oxygen atom (Sb-- 02.942 A) or the distant sulphur (SbS 3.31 The eight-membered ring... 

Phosphorus, arsenic, antimony and bismuth multiply bonded systems with low coordination number — their role as complex ligands. O. J. Scherer, Angew. Chem., Int. Ed. Engl., 1984, 24, 924 (85). 

Antimonate, hexafluoro-, 3, 276 Antimonate, tris(cthyl dithioearbonate)-electron pair, 1, 37 Antimonates, 3, 265 Antimonic acids, 3, 265 Antimony, 3, 237-294 biology, 3,277 carcinogenicity, 3, 278 coordination number, 3, 256 determination... 

This chapter covers five-membered monoelementaheterocycles of arsenic, antimony, and bismuth and includes benzo-, dibenzo-, unsaturated, partially unsaturated species and some with a different coordination numbers (CNs). 

Low-coordination organoantimony compounds are species with the coordination numbers 1 or 2 at the antimony centers, for example, stibinidenes R-Sb, distibenes R-Sb=Sb-R, stibaalkenes, R-Sb=CR2, or cyclic compounds. Stable monomeric stibinidenes or stibaalkenes are not known. Complexes with stibinidene ligands are, however, well established, and trapping of a sterically hindered stibinidene, RSb, R = 2,4,6-(MesSi)2CH]3C6H2 is achieved as a cycloadduct... 

The oxides and acids of antimony resemble those of arsenic, except that antimony in antimonic acid has coordination number 6, the formula of antimonic acid being HSb(OH)3. A solution of potassium antimonate, K+[Sb(OH)g], finds use as a test reagent for sodium ion sodium antimonate, NaSb(OH)3, one of the very few sodium salts with slight solubility in water (about 0.03 g per 100 g), is precipitated. The. antimonate ion condenses to larger complexes when heated this condensation may ultimately lead to macromolecular structures, such as... 

The first part of this section deals with complex compounds with arsenic, antimony or bismuth acting as central atoms. They have been ordered according to the coordination number of the element and, within these sections, according to the donor properties of the ligands and to an ionic or covalent type of the complex. In the second part we report on organoelement compounds coordinated to transition metals or main group elements. 

Oxadithia- or trithiastibocanes or -bismocanes of the type RE[(SCH2CH2)2X] (R = Ph, substituted Ph X = O, S) contain six-coordinated antimony or bismuth in the + III oxidation state. The metal atom realizes its coordination number of six by trans-annular interaction with oxygen or sulphur and additional intermolecular interactions. 

Bismuth trichloride forms a 1 1 Menshutkin-like complex with mesitylene " and a 2 1 complex with hexamethylbenzene , in which the arene is bonded to bismuth at distances to the ring centre of ca 3.1 A. As with the related antimony complexes, there are also a number of intermolecular chlorine bridges, raising the bismuth coordination number and leading to either sheets or tetrameric bismuth chloride networks. These compounds differ from the antimony halide analogues where the arene is usually acentrically bonded. 

Dithioacid complexes of bismuth are numerous (Table 4) and repeat many of the structural motifs of their arsenic and antimony analogues, most notably the very asymmetric coordination ( anisobidentate ), although, as a consequence of the larger bismuth atom, higher coordination numbers are more evident. In the xanthates, seven-coordinate bismuth appears to be favored, although this is achieved in different ways in [Bi(S2COR)3] (R = PhCH2, c-CeHn, Bu ) there are... 

In molecular lattices, chain lattices and layer structures the coordination numbers are found to be increased by applying sufficient pressure, and at very high pressure a highly coordinated metallic packing is obtained. For example phosphoms is converted into a structure in which its homologous element, antimony, is stable at ordinary pressure (16). 

Antimonates, hexafluoro-, 276 Antimonic adds, 265 Antimony, 237-294 biology, 277 cardnogenidty, 278 coordination number, 256 electronic structure, 256 in medidne, 278 pharmacology, 278 teratogenidty, 278 toxicology, 277... 

---