Antimony complexes bonding

The reaction of SbCl3 with [(PNR)2(NRLi THF)2] leads to a polycyclic cage complex of the formula [(PNR)2(NR)2 Sb]Cl where antimony is bonded to three nitrogen and one chlorine atom. Antimony in a square planar environment of four nitrogen atoms exists in porphyrins and related macrocycles. Sb-N bonds also exist in antimony azides. The mixed chloride diazide SbCl(N3)2 is formed from NaNs and SbCfr at room temperature. ... 

Arsinidene and stibinidene complexes. Arsenic and antimony in their +1 oxidation state can be stabilized by a metal-arsenic (or antimony) n bond with a trigonal planar coordination. PhE[Mn(CO)2Cp]2 was prepared as its arsenic " and antimony derivatives . 

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. 

Phosphorus, Arsenic, Antimony and Bismuth Ligands Table 20 (f -RP=CRJ Complexes, Bond Lengths and Angles... 

Antimony(III) chloride forms colored 7t-complexes with double bond systems (e.g. vitamin A). 

Alkyl silyl ethers are cleaved by a variety of reagents Whether the silicon-oxygen or the carbon-oxygen bond is cleaved depends on the nature of the reagent used Treatment of alkoxysilanes with electrophilic reagents like antimony tri-fluonde, 40% hydrofluonc acid, or a boron tnfluonde-ether complex results in the cleavage of the silicon-oxygen bond to form mono-, di-, and tnfluorosiloxanes or silanes [19, 20, 21) (equations 18-20)... 

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). 

The structural chemistry of some metal dithiocarbamates, i.e. systematics, coordination modes, crystal packing, and supramolecular self-assembly patterns of nickel, zinc, cadmium, mercury,363 organotin,364 and tellurium,365 366 complexes has been thoroughly analyzed and discussed in detail. Supramolecular self-assembly frequently occurs in non-transition heavier soft metal dithiocarbamates. Thus, lead(II),367 bismuth(III)368 zinc,369 cadmium,370 and (organo)mercury371 dithiocarbamates are associated through M- S secondary bonds, to form either dimeric supermolecules or chain-like supramolecular arrays. The arsenic(III)372 and antimony(III)373 dithiocarbamates are... 

Antimony Sb(III) and Sb(VI) adsorbed as ammonium pyrrolidine dithiocarbamate complexes onto Cis bonded silica Graphite furnace AAS 0.05 [xg/1 [860]... 

Recently, also the coordination of a tertiary stibine to antimony acceptors with formation of a coordinative Sb-Sb bond was investigated. Examples are the complexes of Me3Sb with SbMeI2,47 Sbl348 or Me2Sb +. 49... 

Attempts to obtain alkylcarbonium complexes by dissolving alkyl chlorides (bromides) in liquid Lewis acid halides (stannic chloride, titanium (IV) chloride, antimony pentachloride, etc.) as solvent were unsuccessful. Although stable solutions could be obtained at low temperature with, for example, t-butyl chloride, the observed N.M.R. chemical shifts were generally not larger than 0 5 p.p.m. and thus could be attributed only to weak donor-acceptor complexes, but not to the carbonium ions. The negative result of these investigations seems to indicate that either the Lewis acids used were too weak to cause sufficient ionization of the C—Cl bond, or that the solvating effect of the halides... 

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