**Author details**

*Post-Transition Metals*

**Electrolyte Coordination** 

*Change in isochoric heat capacity.*

**number of cations**

Tl(ClO4)3 6 13,4 116

**"Acoustic" hydration number**

Al(ClO4)3 6 12,4 411 373 296 223

In(ClO4)3 6 11,0 345 322 257 205

Sc(ClO4)3, 6 11,3 383 327 248 195 151 Ga(ClO4)3 7–8 12,5 343 290 233 186 144 (3,83 m) Y(ClO4)3 6 13,2 320 276 211 163 114

corresponding to formula In5(JO6)3, the composition of which is constant at a temperature of 120–270° C. The crystalline compound of indium paraperiodate is slightly soluble in water, and respectively, in 1%, 0.3% and 0.5–1% carbonate, nitrate and ammonium acetate, but it is readily soluble in dilute mineral acids. The solubility of indium paraperiodate in water at 20° C is 6,4⋅10−4 g-mol/dm3

*Correlation of the polarizing forces of cations (P) and the eutectic concentration (meut) of aqueous solutions of* 

indium using the periodate ion are based on these analytical characteristics [59].

tion sphere of indium, it can be considered proven that indium acidic complexes are not formed in aqueous solutions, and in this case we are only talking about the

in a number of organic systems, apparently, their participation in complex formation is possible, but such states, being weaker than contact interactions, are rather difficult to fix. Perchlorate ion and perchloric acid in indium compounds perform primarily the function of a dehydrating agent; therefore, their presence leads to a change in the characteristics of the interaction of ions with water, which is reflected

turing water, which contributes to the stabilization of hydration shells around

competition with cations for water, as a result of which, in particular, an increase in the asymmetry of coordination water molecules and its additional polarization is possible. Indium (III) cations attach a larger number of layers of water and, to varying degrees, affect its state, and through it, the action spreads further to the

Answering the question whether the ClO4

*group III perchlorates MeIII(ClO4)3 ([50], pp. 124–126).*

possibility of the outer-sphere interaction of ClO4

in the physicochemical properties of indium perchlorates. Apparently, in relatively dilute solutions, the role of ClO4

hydrophilic indium cations. In concentrated solutions, ClO4

. The gravimetric and titrimetric methods for the determination of

−

−

or

ion is included in the inner coordina-

**Change in isochoric heat capacity –**Δ*С***V2 (J/K**⋅**mol) upon dissolution of subgroup III metal perchlorates on concentration (m) 0,5 m 1 m 2 m 3 m 4 m**

(3,19 m)

−

−

ions with aquocation. However,

is reduced to destruc-

anions enter into some

**52**

7,9⋅10−3 g/dm3

**Figure 8.**

**Table 1.**

Boris Radionov Konstantinovich and Ilya Svirsky Anatolievich\* Ural Federal University Named After B.N. Yeltsin, Yekaterinburg, Russia

\*Address all correspondence to: sviskill.171993@gmail.com

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