Sodium cation complexes

Sodium cation complexation behavior of the heteroaromatic sidechains of histidine and tryptophan, J. Hu, L. J. Barbour, R. Ferdani and G. W. Gokel, Chem. Commun., 2002, 1810. 

Blixt, J. Detellier. C. Kinetics and mechanism of the sodium cation complexation by 5,11,17,23-tetra-p-r< /t-butyl-25,26,27,28-tetramethoxy-calix[4]arene in solution. J. Am. Chem. Soc. 1995. 117. 8536-8540. 

Cooperative enhancement of anion complexation is promoted by sodium cation complexation of the aza-oxa crown, combined with the amide-linked cobaltocenium, 74. The result is that the compound acts as a host to both the cation and anion of sodium chloride. 

Heaton AL, Ye SJ, Armentrout PB. Experimental and theoretical studies of sodium cation complexes of the deamidation and dehydration products of asparagine, glutamine, aspartic acid, and glirtamic acid. J Phys Chem A. 2008 112 3328 38. 

Molybdenum and tungsten hexacarbonyls are able to form anionic complexes (AsPli4)2[(OC)4M( -pz)2M(CO)4] upon reaction with sodium pyrazolate and PluAsCl (72CB3203). The cationic complexes [(rj -Cp)2Mo(/Lt-pz)2Mo(rj -Cp)2] " (n = 2, 3) are known as well (74HCA1988). The other representatives of the complexes containing an exobidentate ligand (26) are derived from 4//-pyrazoles [70ZAAC(379)169]. 

The N-coordinated compound [AuCljL] (L= l-ethyl-2-phenylimidazole) with silver tetrafluoroborate gives the cycloaurated species 102, which on further reaction with triphenylphosphine and sodium tetrafluoroborate or ammonium hexafluorophosphate forms the cationic complexes 103 (X = BF., PF,) (00JCS(D)271). 

Interaction of the latter with triphenylphosphine in the presence of sodium perchlorate leads to the cationic complex [(dppm)Au2(li-L)Pd(C Fj)(PPh3)]C10. Reactions of [L Au(p-L)AuL ] (L = bibenzimidazolate L = PPh, dppm)] with [Pd(0C103)(C Fj)(PPh3)2] do not lead to the tetranuclear products. Only the bibenzimidazolate (L) dinuclear product [(PPh3)(C F3)Pd(p-L)Pd(C, F3)(PPh3)] could be isolated in both cases. 

Cholanic acid also possesses the ability of transporting cations across a lipophilic membrane but the selectivity is not observed because it contains no recognition sites for specific cations. In the basic region, monensin forms a lipophilic complex with Na+, which is the counter ion of the carboxylate, by taking a pseudo-cyclic structure based on the effective coordination of the polyether moiety. The lipophilic complex taken up in the liquid membrane is transferred to the active region by diffusion. In the acidic region, the sodium cation is released by the neutralization reaction. The cycle is completed by the reverse transport of the free carboxylic ionophore. 

Structural characteristics of compounds with X Me = 8 are collected in Table 17. Na3NbF8 and Na3TaF8 compounds that form similar crystal structure [77], The structure of Na3TaF8 was determined by Hoard et al. [136], by means of X-ray diffraction of a single crystal. Na3TaF8 is composed of sodium cations and isolated complex ions TaF83, in an Archimedean antiprism configuration, as shown in Fig. 23. 

Alkyl or hydride derivatives are formed by addition of a variety of Grignard reagents or sodium isopropoxide to the halide precursors. Cationic complexes may be obtained by the interaction with AgSbFg in the presence of an appropriate... 

Initially, on addition of sodium cations to a solution of the ligand, two distinct CV waves were observed, corresponding to the uncomplexed and complexed compound [1] (Fig. 4) (Chariot et al., 1962). Hie wave at the higher positive potential corresponds to the solution complexed species. Hie oxidized ferrocene crown ether has a lower binding constant with sodium than the... 

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