PFGs

As an example figure B 1.14.13 shows the droplet size distribution of oil drops in the cream layer of a decane-in-water emulsion as determined by PFG [45]. Each curve represents the distribution at a different height in the cream with large drops at the top of the cream. The inset shows the PFG echo decay trains as a fiinction of... 

Examples Ca[PFg]2, calcium bis(hexalluorophosphate) and (CioH2i)3P04, tris(decyl) phosphate instead of tridecyl which is (Cj3H27—). 

The PFg ion can be determined by precipitation with nitron or tetraphenyl-arsonium chloride (69). 

Fig. 9. Initiation of epoxy cure. Irradiation of a triaryl sulfonium salt produces a radical cation that reacts with an organic substrate RH to produce a cation capable of releasing a proton. The proton initiates ring-opening polymerization. X = BF , PFg, AsFg, and SgFg. ...

Phenomeon Di Process Moni Internal E Name Gene Mixer Pump iLotus 1-2-3 1 PFG and PIG ... 

Solid salts in which the nitronium ion is the cation can be prepared with unreactive anions such as BF4 and PFg . These salts can act as nitrating reagents. 

PSS columns for fluorinated eluents PSS PFG columns were developed by PSS because users worldwide were unsatisfied with the stability of conventional organic SEC columns when running solvents such as hexafluroisopropa-nol (HFIP). Because polymeric gels tend to be unstable in fluorinated media, PSS modified silica to achieve better stability while maintaining perfect chromatographic performance. 

PSS SDV columns can be used for all applications requiring organic eluents. The exception to the rule is the exclusion of lower aliphatic alcohols (e.g. methanol) from the otherwise complete list (28). For fluorinated solvents such as TFE and HFIP, PSS recommends its specially designed PFG columns (cf. Section V1I,C), which have a much longer life in this kind of demanding eluents. Figures 9.13 through 9.19 show some unusual applications that illustrate the variety of solvents and the feasibility of the columns. 

PSS Polar Fluoro Gel (PSS PFG) is available in four individual porosities (100, 300, 1000, and 4000 A) and in a linear mixed-bed eolumn eovering all... 

FIGURE 9.27 Analysis of recycled polybutylene terephthalate. Columns PSS PFG 100 + 1000. Eluent HFIP. Temp 2S°C. Detection UV 254 nm, Rl. Calibration PSS PBT standards (broad). 

Thermal arene exchange of tetramethylthiophene with [(/ -cymene)RuCl2]2 affords 130 (89JA8828), which on reaction with AgBE4 and excess tetramethylthiophene yields 131. The Ru—S thiophenic cluster, 132, was synthesized by reaction of 130 with (Mc3Si)2S followed by anionic metathesis and formation of the PFg salt. The coordination geometry around each ruthenium atom is pseudooctahedral. 

Reaction of [Ir(rj -cod)(/x-pz)]2 with nitrosyl tetrafluoroborate yields 140 (L2 = cod), the cationic nitrosyl complex [85JCS(CC)908]. The 3-methylpyra-zolato complex reveals the same type of behavior, while 3,5-dimethylpyrazolato derivatives give a different kind of product Oxidation of [Ir( j -cod)(/i,-pz )]2 with nitrosyl tetrafluoroborate or hexafluorophosphate leads to 141 (X = BF4, PFg). 

Dilithium octaphenyltetraphosphafulvalene with [(i -Cp)Fe(i -],4-Me2C6H4](PFg) gives the 17 -coordinated species 203, which is unstable with respect to oxidants but can be stabilized by reacting with [ rf-nbd)Cr(CO)4] (92AGE1031). The latter affords the chelate complex 204. 

Pfg. abbrev. pfennig, pfennigs, pfiff, prat, (of pfeifen) whistled, piped. 

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