Lodine complexes

Miyasaka, K. PVA-lodine Complexes Formation, Structure and Properties. Vol. 108. pp. 91-130. 

Figure 16-6 (a) Schematic structure of the starch-iodine complex. The amylose chain forms a helix around l6 units. [Adapted from A T. Calabrese and A. Khan, "Amylose-lodine Complex Formation with Kl Evidence for Absence of Iodide Ions Within the Complex." J. Polymer Sci. 1999, A37,2711.] (fc>) View down the starch helix. Showing iodine inside the helix.8 [Figure kindly provided by R. D. Hancock, [rower Engineering, Sett Lake City.]... 

Many studies have also been made on the structure and properties of the Amylose-lodine complex [37-40]. Zwick [41] published a concise review of some important features of the Amylose-lodine complex. 

The study of the Influence of solvents on the formation of the starch-lodlne-complex has revealed that the water requirement is not related to either the dipole moment or the dielectric constant of the solvent ( ). Moullk and Gupta have shown that surfactants and cosolvents, mainly destabilize the amylose-lodine-complex, and the overall polarity of the mixed medium is insufficient to systematize the solvent effect ( ). One et al have reported that the blue colour of the amylose-iodlne-complex is not formed in dimethyl sulphoxide-water mixtures containing less than 28 moles of water per litre (25). 

Influence of urea on amylose-iodlne-complex/ amylose-SDS-lodine-complex Urea is known to have a destabilizing influence on the amylose-iodine-complex, resulting in a reduction in the absorbance at 64o nm. This is evident from the study of Influence of urea on amylose-iodine-complex (Figure 6a). Urea also increases the flexibility of the polymer chain by affecting the intramolecular H-bonds (36 ), The inhibitory influence of SDS on the absorbance of amylose-iodine-complex at 640 nm was rapidly overcome at 30°C when urea (4.5 K) was added to amylose-SDS-iodine-complex, This is clearly evident from the study of influence of urea on amylose-SDS-iodine-complex (sequence-1 Figure 6b). 

The sequence of addition of reagents had a little Influence (Figure 7A) on the system equilibrated at 30°C and 6o°C (Figure 74 7B). Further, addition of urea to amylcse-SDS-coroplex before or after the addition of iodine(It) made no difference. These results imply that hydrophobic interactions and H-bonds play an important role in the formation of amylose-SDS-lodine-complex/amylopectln-SDS-iodine-complex. 

Amylose is the only homopolysaccharide of D-glucose which exhibits the unique property of forming a blue coloured amylose-lodine-complex in aqueous... 

Matsuoka, H. and Ise, N. Small-Angle and Ultra-Small Angle Scattering Study of the Ordered Structure in Polyelectrolyte Solutions and Colloidal Dispersions. Vol. 114, pp. 187-232. Miyasaka, K. PVA-lodine Complexes Formation, Structure and Properties. Vol. 108, pp. 91-130. 

Chem. Descrip. Polyethoxypolypropoxypolyethoxyethanol-lodine complex Uses Germicide for formulating low-foaming cleaners and sanitizers Features Broad spectrum iodophor Regulatory EPA compliance Properties Liq. 20% act. 

Most contrast agents elicit nephrotoxicity because they are primarily excreted by the kidneys. However, when administered in small doses, they constitute a rich source of GFR markers. The two major classes of contrast agents that are finding clinical utility as GFR markers are iodinated aromatic compounds and metal complexes. lodinated aromatics such as iohexol and iothalamate (Fig. 13) are commonly used as contrast agents for computed tomography (GT). They also have pharmacokinetics similar to inulin and hence are useful indicators of renal status [215]. The iodinated molecules used for GFR measurements consist of a triiodo-benzene core and hydrophilic groups to enhance solubility in aqueous medium. 

The yellow crystalline half-sandwich 38 was prepared in 81% yield from the tricyclic zirconium species 37 upon treatment with the dioxane complex of germanium dichloride in tetrahydrofuran (THF) at 70 °C for 48 h. lodination of 38 in toluene at —30 °C led to the immediate disappearence of the purple color. After stirring for 18 h at 25 °C the tricyclic cage compound 39 was formed quantitatively according to nuclear magnetic resonance (NMR) spectra. Due to its excellent solubility the isolated yield dropped to only 21% (Scheme 14) <20030M2891>. 

Emissions from both the and the previously unreported lli states of the IF molecule have been observed in the gas-phase reaction of L with F2 at low pressure a four-centre complex has been proposed as the reaction intermediate. A combined theoretical-experimental programme has been conducted to establish techniques for the study of excited-state transitions in Ij and IC1. Experimental techniques based on two-step excitation using two synchronized, tunable lasers have been developed, and successfully applied to excited-state fluorescence measurements on ICl. lodine(i) chloride adsorbed on silica gives the same Raman spectrum as that obtained from adsorbed l2. ... 

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