Effect of Temperature on the Stability of Re(V) Complexes with N-Ethylthiourea

Jamoliddinov, F. J.; Safarmamadzoda, S. M.; Davlatshoeva, J. A.

doi:10.1134/s0036024421080100

Cited by 1 publication

(1 citation statement)

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“…This is also consistent with a simple inclusion complex involving neutral molecules; by contrast, the charge in Inmay have been expected to induce local changes in the neighboring polyscachharide units. 37,[99][100][101][102][103][104][105] According to semiempirical calculations, binding of water or of interspersed water and iodine molecules inside the amylose helix results in slight steric distortions of the polymer. 106 The water molecules were found to adhere closely to the walls of the internal channel of amylose and to exclude I2 from interactions, suggesting that I2 molecules alone would be unable to dislocate water molecules from inside the amylose helix.…”

Section: The I2-only Hypothesismentioning

confidence: 99%

The Iodine/Iodide/Starch Supramolecular Complex

Silaghi-Dumitrescu,

Pesek

2023

Preprint

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The nature of the blue color in the iodine-starch reaction (or, in most cases, iodine-iodide-starch reaction, i.e. as I2 as well as I- are typically present) has for decades elicited debate. The intensity of the color suggests a clear charge-transfer nature of the band at ~600 nm, and there is consensus regarding the fact that the hydrophobic interior of the amylose helix is the location where iodine binds. Three types of possible sources of charge transfer have been proposed: (1) chains of neutral I2 molecules, (2) chains of poly-iodine anions (complicated by the complex speciation of the I2 - I- mixture), or (3) mixtures of I2 molecules and iodide or polyiodide anions. An extended literature review of the topic is provided here. According to the most recent data, the best candidate for the “blue complex” is a I2-I5-I2 unit – expected to occur in repetitive manner inside the amylose helix.

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