Glycolate complexes

Fig. 20. Molecular structure of the glycolate complex anion [Be6(0CH2C02)8]4. Reproduced with permission from Ref. (182). Copyright 1992, Verlag der Zeitschrift fur Naturfors chung.

Soluble oil metal-working fluids, 1 22 Soluble oils, 15 240 Soluble silicates, 22 451-452 dissolution of, 22 455-456 history and applications of, 22 452 Soluble starch synthases, 12 492 Soluble titanium glycolate complexes, 25 87 Solute clearances... 

Lenhart, J.J. Bargar, J.R. Davis, J.A. (2001) Spectroscopic evidence for ternary surface complexes in the lead(ll)-malonic acid-hematite system. J. Coll. Int. Sci. 234 448-452 Lenhart, J.L. Honeyman, B.D. (1999) Uranium (VI) sorption to hematite in the presence of humic acid. Geochim. Cosmochim. Acta 63(19/20) 2891-2901 Leussing, D.L. Kolthoff, I.M. (1953) Iron-thio-glycolate complexes. J. Am. Chem. Soc. 75 3904-3911... 

Table 28. Stability constants of some rare eartha glycolate complexes [406]...

Similar calculations were conducted also for the analogous glycolate complexes, using the hydrido complex 74 as model (Figure 9)30a. The calculations confirmed the ground state structure (I) established for similar compounds in the solid state. The diastereomeric TBP structures II and III, as well as the distorted SP structures IV and V, were calculated... 

Intermolecular ligand exchange has been reported in bis-catecholates as well as in bis-glycolate complexes (equations 1829 and 1949, respectively). This was observed after 24 h by the appearance of NMR signals for the mixed complex (76 and 77 respectively) in the 14, 13 C and 29 Si spectra, as well as by FAB MS experiments. A statistical distribution of the three compounds was evident from the 1 2 1 triplet found in the 29Si spectrum. 

Respiratory effects typically associated with inhalation of particulates and lung overload have been observed in animals. The pulmonary toxicity of alchlor (a propylene glycol complex of aluminum chlorhydrate), a common component of antiperspirants, was examined in hamsters in a series of studies conducted by Drew et al. (1974). A 3-day exposure to 31 or 33 mg Al/m3 resulted in moderate-to-marked thickening of the alveolar walls due to neutrophil and macrophage infiltration and small granulomatous foci at the bronchioloalveolar junction (a likely site of particulate deposition). A decrease in the severity of the pulmonary effects was observed in animals killed 3, 6, 10, or 27 days after exposure termination. Similar pulmonary effects were observed in rabbits exposed to 43 mg Al/m3 for 5 days (Drew et al. 

In animals, information on effects from inhalation exposure is available for pure aluminum flakes, aluminum chlorhydrate antiperspirants, and a propylene glycol complex of aluminum chlorhydrate. 

Drew RT, Gupta BN, Bend JR, et al. 1974. Inhalation studies with a glycol complex of aluminum-chloride-hydroxide. Arch Environ Health 28 321-326. 

Neither Cainelli nor Herrmann reported a reliable test for stability of the anchoring (388, 389). Our experience indicates that Os massively leaches from PVP under oxidative conditions, and the filtrates are usually at least as active as the suspension. The suspension contains the base pyridine, which can retard the hydrolytic diol release from the Os(VI) glycolate complex (the latter step is often rate determining). 

The literature contains numerous observations on the properties of polysaccharides in cuprammonium solutions the work on cellulose is especially voluminous. Viscometric measurements in cuprammonium solution are regularly employed to determine the size of cellulosic molecules. However, before the spatial requirements for complexing with cuprammonium became known the properties of the complexes of polysaccharides could not be interpreted in terms of the structure of their monosaccharide units. With the present understanding of cupram-monium-glycol complexing, some of the earlier observations will be reexamined. 

Specific rotations in cuprammonium are based upon the weight of the glycol-containing molecule, not upon the weight of the copper glycol complex. This provision is necessary since the structures and molecular weights of the complexes are unknown. The optical rotations are the result of a reversible reaction, hence they are particularly dependent upon the concentrations of the reactants. The composition of the... 

Specific resistance increments (A,., .) of 20 ohm, cm-4 may be encountered without the actual occurrence of cuprammonium-glycol complexing values above 20 are indicative of a significant amount of complexing. 

Table 3. Thermodynamic functions for the formation of glycolate complexes at 1 = 2 M (NaClOf) and 25° C. All values of A H calorimetrically determined...

The hydrodynamic behavior of complex particles in solution is similar to that of suspensions of solid spheres. Applying to the solutions of the PMAA-poly(ethylene glycol) complex, Einstein s equation for the viscosity of suspension of spherical particles, t]Sp/c = 2.54 q> (where tp is the volume fraction of dissolved substance) the solvent content in complex coils has been estimated33. It is about 75 vol%, i.e. the complex particles contain comparatively small quantities of the solvent in comparison with a usual random coil in solution which contains about 97-99 vol% of solvent34. ... 

TABLE 8 Data Characterizing Catalytic Hydroformylation of Various Olefins with Rhodium Polyethylene Glycolate Complex.°... 

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