Features of inverted tetrasulfophenylporphyrin protonation. Crucial role of hydrogen bonds Текст научной статьи по специальности «Химические науки»

Porphyrins Порфирины

Макрогэтэроцмклы

http://macroheterocycles.isuct.ru

Paper Статья

DOI: 10.6060/mhc181109s

Features of Inverted Tetrasulfophenylporphyrin Protonation. Crucial Role of Hydrogen Bonds

Vladimir B. Sheinin,a@ Olga M. Kulikova,a and Oscar I. Koifmanab

aG.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, 153045 Ivanovo, Russia

bIvanovo State University of Chemistry and Technology, 153000 Ivanovo, Russia

@Corresponding author E-mail: vbs@isc-ras.ru

Diprotonation equilibria of inverted platform of tetraanionic 5,10,15,20-tetrakis(4'-sulfophenyl)-2-aza-21-carbaporphyrin, H2fP(PhSO3H)4, with perchloric acid in water was studied using DFT/B3LYP/6-31 + +G(d,p) and spectropotentiometric titration methods. In aqueous solution this porphyrinoid exists in the form of NH tautomer HI P(PhSO3')4 with an inverted pyrrolenine ring, which is stabilized by bifurcated intramolecular hydrogen bonds between two pyrrole hydrogens and one pyrrolenine nitrogen. Intramolecular hydrogen bonds protect intramolecular hydrogen-bonding sites from intermolecular interactions. For this reason, the external nitrogen atom is protonated first, and then the internal one is protonated. The second proton switches the intramolecular hydrogen bonds to intermolecular hydrogen bonds. Diprotonated platform HJP2+(PhSO~)4 has the geometry of elastic 1,3-alternate, which is a molecular and anionic receptor. The equilibrium of the second stage protonation in water is completely shifted to the aquacomplex [HJP2+(PhSO3) J(HjO)2, which is formed due to the hydrogen and electrostatic binding of the solvent molecules on both receptor sites. Aquacomplex [HJP++(PhSO3) J(H2O)2 is a monomer of linear J-aggregates self-assembly. The driving force of J-aggregates assembly is the formation of stronger anionic complexes as a result of water molecules intermolecular replacement by sulfonate groups of monomers.

Keywords: Tetrasulfophenyporphyrin, inverted (N-confused) porphyrins, protonation, hydrogen bond, J-aggregates.

Особенности протонирования инвертированного тетрасульфофенилпорфирина в воде. Критическая роль водородных связей

В. Б. Шейнин,^ О. М. Куликова,а О. И. Койфман^

аИнститут химии растворов им. Г.А. Крестова Российской академии наук, 153045 Иваново, Россия ъИвановский государственный химико-технологический университет, 153000 Иваново, Россия ®Е-таИ: vbs@isc-ras.ru

Методами DFT/B3LYP/6-31++G(d,p) и спектропотенциометрического титрования исследованы равновесия дипротонирования инвертированной платформы тетрааниона 5,10,15,20-тетракис(4'-сулъфофенил)-2-аза-21-карбапорфина H2[P(PhSO3H)4 хлорной кислотой в воде. В водном растворе этот порфириноид находится в виде ЫН-таутомера Н2[ (.)Р(РИ803~}4 с инвертированным пирроленинным кольцом, который стабилизируется бифуркатными ВМВС между двумя пирролъными водородами и одним пирроленино-вым азотом. ВМВС защищают внутримолекулярные центры водородного связывания от межмолекулярных взаимодействий. По этой причине первым протонируется внешний атом азота, а внутренний протонируется вторым. Второй протон переключает ВМВС на ММВС. Дипротонированная платформа Н[Р2+(РН803)4 имеет геометрию упругого 1,3-алътерната, который обладает свойствами молекулярного и анионного рецептора. Равновесие второй ступени протонирования в воде полностью сдвинуто к ак-вакомплексу [Н[Р2+(PhSO3)4](Н20)2, который образуется за счет водородного и электростатического связывания молекул растворителя в двух сайтах рецептора. Аквакомплекс [H[P++(PhSO3~)]Н20)2 представляет собой мономер самосборки линейных 3-агрегатов. Движущей силой образования З-агрегатов

является образование более прочных анионных комплексов в результате межмолекулярного замещения молекул воды сульфонатными группами мономеров.

Ключевые слова: Тетрасульфофенилпорфирин, инвертированные порфирины, протонирование, водородная связь, ./-агрегаты.

Introduction

Experimental

The key part of supramolecular porphyrin assemblies in nature inspires researchers to developed bio-mimetic systems for a wide range of applications. The molecular structure of porphyrins is easily modified both on the core and periphery, providing a structural complementary of monomer units leads to supramolecular self-assembly.[1-12] Understanding such processes attracted great interest due to the apparent potential of the functional nanomaterials self-assembly strategy, which opens up the splendid perspectives for the directed design of chemo-sensors, molecular switches, luminescent sensors, photon wires and catalysts. To date, a wide range of regular discrete porphyrin nanostructures such as nanotubes, fibers, wheels, spheres, plates, etc. have been obtained.[1314] Water-soluble derivatives of 5,10,15,20-tetrakis(4'-sulfophenyl) porphyrin H2P(PhSO3H)4 are widely used as building blocks for such structures, due to the successful combination of availability and good solubility of such compounds in water. Promising derivatives of H2P(PhSO3H)4 are water-soluble porphyrinoids with inverted pyrrole ring, such as 5,10,15,20-tetrakis(4'-sulfophenyl)-2-aza-21-carbaporphy-rin H2IP(PhSO3H)4 and 2-AT-methyl-5,10,15,20-tetrakis(4'-sulfophenyl)-2-aza-21-carbaporphyrin H2MeIP(PhSO3H)4.

Investigations of inverted porphyrins properties, including aqueous media, have been carried out since their discovery due to the unique structure of these compounds. [15-25] Previously it was shown that diprotonated inverted platform possesses the properties of anionic receptor,[826] the zwitterions H4IP2+(PhSO3-)4 and H3MeIP2+(PhSO3-)4 are able to form supramolecular ./-aggregates, stable in pH-neutral aqueous solutions.[21,27]

In this work we presented the results of theoretical and experimental studies of H2IP(PhSO3-)4 diproton-ation equilibria, resulted in formation of aquacomplex [H4IP2+(PhSO3-)4](H2O)2, which is /-aggregates self-assembly monomer.

All commercially available solvents and reagents were used without further purification: jV,jV-Dimethylformamide (0.01 % H2O, Panreac), dichloromethane (for HPLC, 99.8 %, Acros Organic s), distilled water (ISC RAs), perchloric acid (70 %, ASC reagent, Aldrich). 5,10,15,20-Tetraphenyl(2-aza-21-carbaporphy-rin, (H2IP(Ph)4),[28] 5,10,15,20-tetrakis(4'sulfophenyl)-2-aza-21-carbaporphyrin[27] were synthesized according to reported procedures. Micropipette with scale division value 6.310-5 mL was used for titration experiment. The absorbance and fluorescence spectra were recorded synchronous at 25 0C in 1x1 cm optical quartz cells using a fluorescence spectrophotometer (Avantes AvaSpec 20482, Netherlands) equipped with a qpod© (Quantum). The basicity constants were calculated by the fitted parameters method using SigmaPlot® (Systat Software Inc. (SSI)) software. Quantum chemistry calculations were performed at the B3LYP level of density functional theory DFT/ B3LYP/6-31++G(d,p) using Gaussian software package.[29]

Results and Discussion

Inversion of Tetraanion H2P(PhSO3-)4 Porphyrin Platform

Dissolution of H2IP(PhSO3NH4)4 (as well as H2P(PhSO3NH4)4) in waterleads to tetraanion H2IP(PhSO3-)4 formation based on substituted by four phenylsulfonate radicals in porphyrin platform. These peripheral substituents are in inductive interaction with inverted platform H2IP, which exhibits electron-withdrawing effect, and weakly coupled with each other. The dissociation constants values of the peripheral sulfonic groups of H2IP(PhSO3H)4 are unknown, but they are comparable with those for benzene-sulfonic acid (pKa=0.7). Since the platform H2IP in water is diprotonated first, and the platform electron-withdrawing effect increased in the series H2IP, H3IP+, H4IP2+ with positive charge increasing, all four phenylsulfonate groups in acidic aqueous solutions will be ionized. For this reason,

SO3" -O3

SO3"

H2P(PhSO3-)4

SO3" "O3S

и SQf

H2l(i)P (PhSO3-)4

H4IP2+(PhSO3-)4

in presented article we consider the processes exclusively involving tetraanions H2IP(PhSO3-)4, H2P(PhSO3-)4 and the products of the porphyrin platform protonation.

The porphyrin platform H2P is formed by different in structure pyrrole (A) and pyrrolenine (B) rings (Figures 1, 2(1)). As a result of the pyrrole or pyrrolenine ring inversion, two NH-tautomers H2IP with a different combination of three internal and one external centers of H-bonding (HB) are formed. Inversion of the pyrrole ring results

in a HI xP tautomer formation with an external HB-donor

2 (e)

NH-group and two bifurcated intramolecular hydrogen bonds (IMHB) of the NHN type. Pyrrolenine ring inversion results in a H2I(i)P tautomer with an external HB-acceptor nitrogen atom and two bifurcated IMHB of the HNH type.

Enthalpy dissipations due to H2P(PhSO3-)4 porphyrin platform inversion are 13.01 and 17.34 kcal/mol for H2I P(PhSO3-)4 and H2I(e)P(PhSO3-)4, respectively. Thus' in the absence of medium effects, the tautomer H2I P(PhSO3-)4 is more stable than H2I(e)P(PhSO3-)4 by 4.33 kcal/mol, due to a more effective IMHB. Two opposite types of specific solvation external centers are the cause of the dependence of inverted porphyrins tautomeric equilibrium from solvents HB-donor (EP) and HB-acceptor (Ea) properties.[30'31]

Conjugated tautomers of inverted porphyrins possessed the different UV-Vis spectra,[32] which general view

was used for identification of H,I,.,P(PhSO,-). and HT,

2 (i) 34 2 (e)

P(PhSO3-)4 tautomers in solutions (Figure 1).

In conditionally inert DCM (Ea=0.10 and EP=0.11), as in the absence of media effects, inner tautomer H2I P(PhSO3-)4 is more stable. In amphoteric water, which predominately is HB-donor solvent (Ea=1.17 > EP=0.47), the inner tautomer H2I(i)P(PhSO3-)4 is supplementary stabilized due to the more effective specific solvation of external

pyrrolenine nitrogen. Tautomer H2I(e)P(PhSO3"}4 is stable in HB-acceptor solvents, e.g. in DMF (Ea=0, Ep=0.74) or DMSO (Ea=0, Ep=0.88), which "pull out" the inner proton on inverted platform periphery due to the more effective specific solvation of external NH-group. For investigations in aqueous medium, tautomer H2I(e)P(PhSO3-)4 can be fixed by methylation of external NH-bond.[27]

Protonation of H2I(.)P(PhSO3-)4

Molecular Structure of H2I (¡)P(PhSO}')4

Coordination cage of H2IP platform includes one pyrrole HB-donor NH-group and two pyrrolenine HB-acceptor N-atoms. The intramolecular tightness causes the formation of two bifurcated IMHB of NHN type, which, together with the aromatic system, aspire to keep two pyrrolenine and one pyrrole rings in a coplanar state (Figure 2). The deviation of the interatomic distance from the sum of Van der Waals radii was used as a criterion for the IMHB formation or breaking: HB is formed and strengthened when a negative deviation and breaks when a positive deviation (Table 1). According to second Etter's Rule,[33] IMHB that close six-membered cycles have an advantage over intermolecular hydrogen bonds and will block intracyclic atoms from interaction with solvents and anions, as well as in porphyrins, where bifurcated IMHB protects the reaction centers of H2P and H3P+ platforms from intermolecular interactions with polar solvents and anions.[34-39]

The singularity of aromatic tetrapyrrole platforms is the presence of the conventional meso-plane C5C10C15C20, which is only slightly deformed even with a strong distortion of the macrocycle. As a result of intramolecular hydrogen repulsion (IMHR) internal CH-proton escapes from the meso-plane at 0.59 nm, and the inverted

JTV

N"

H / J

■N' N-11

H2l(e)P

donor HB

500 600 700 DCM

500 600 700 DMFA

500 600 700 Water

500 600 700 DMSO

Figure 1. Scheme of H2P(PhSO3")4 porphyrin platform inversion. raeso-Substitutents are omitted for clarity. UV-Vis spectra of inverted NH-tautomers in different solvents are presented on the right side. Bold line shows the aromatic 18n-electron conjugated cycle. DFT-enthalpies of inversion and tautomerization values in kcal/mol, calculated in gaseous phase, are above the arrows. UV-Vis spectrum in DCM corresponds to H2I(i)P(PhSO3NBt4)4.

Figure 2. (1) - Indexing of tetrapyrrole platform. (2) - Tetraanion HjIP(PhSO3")4 DFT-optimized geometry. Gray dashed lines - bifurcated IMHB, red dashed lines - H-n interactions between ^-protons and phenyl rings (distance to phenyl plane center is 3.32 A). Sulfonate groups, located perpendicular to the figure plane, are omitted for clarity.

Table 1. Deviations of intramolecular interatomic distances (A) from the sum of Van der Waals radii (Rw) (H(1.16), N(1.50) O(1.29)).[40]

IMHR IMHB

Compound 2Rw(H) - distance HH Rw(H)+Rw(X) - distance H-X H-N H-O

AB BC CD AD AC BD AB BC CD DA

H^PhSO^ -0.12 -0.33 -0.33 -0.33 -0.33

^P+^hSO^ -0.11 -0.11 +0.05 -0.36 -0.36

^P^PhSO^ +0.25 +0.25 +0.25 +0.25 +0.57 +0.57

[H4F+(PhSO3-)J(H2O)2 +0.23 +0.23 +0.23 +0.23 +0.5) +0.51 -0.41(A,B,C,D)

H^Phso^x -0.32 -0.31 +0.09 -0.37 -0.36

^IP^PhSO^ -0.25 -0.24 +0.09 -0.34 -0.39

^IP^PhSO^ +0.14 +0.18 +0.13 +0.12 +0.32 +0.50

[H4IP2+(PhSO3-)4](H2O)2 +0.18 +0.27 +0.24 +0.24 +0.36 +0.50 -0.09(A) -0.38(B) -0.49(C) -0.36(D)

Table 2. Deviation of pyrrole and pyrrolenine rings (dihedral angle) and intramolecular hydrogen atoms (distance) from different platforms meso-plane: (+) if nitrogen atom is above the plane, (-) if nitrogen atom is below the plane.

Compound ras-plane A(+) B(-) C(+) D(-)

degree(A)

H^PhSO^ 0.18 5.87 (0.05) 6.74 5.87 (+0.05) 6.74

^P+^hSO^ 0.20 19.13 (0.37) 23.55(0.79) 9.14 (+0.38) 17.22

H4P2+(PhSO3-)4 0.20 33.56 (0.78) 33.56(0.78) 33.56 (+0.78) 33.56(0.78)

[H4P2+(PhSO3-)4](H2O)2 0.20 32.10 (0.79) 32.10(0.79) 32.10 (+0.79) 32.10(0.79)

H2I(i)P(PhSO3-)4 2.20 21.53 (0.59) 11.80(0.20) 11.32 14.66(0.31)

H3I(e)P+(PhSO3-)4 2.20 24.81 (0.93) 13.04(0.26) 12.22 12.07(0.24)

^IP^PhSO^ 0.70 34.35 (0.94) 27.26(0.68) 25.73 (+0.79) 25.11(0.64)

[H4IP2+(PhSO3-)4](H2O)2 0.58 33.04 (0.93) 27.93(0.73) 30.03 (+0.87) 26.58(0.70)

ring unfolds at 21.53 degrees (Table 2). In addition, the IMHR and H-n interactions between ¿^-protons and phenyl rings (dihedral angles with meso-plane are close to 40°), appreciably alternating the H2IP(PhSO3-)4 platform (Figure 2(2)).

Molecular Structure of H^P+(PhSO-)4

NH-tautomer H3I(e)P+(PhSO3-)4 stabilized by IMHB is more stable, so external nitrogen atom of inverted ring is protonated first (Figure 3).

Molecular Structure of HJPe+(PhSO4

Further H3I(e)P+(PhSO3-)4 protonation leads to substitution of a IMHB for the IMHR. Perimeter of the aromatic conjugation circuit is expanding, and, as a result, the flexibility of H4IP2+ molecular core increased (Figure 3). The H4IP2+(PhSO3-)4 platform is a elastic 1,3-alternate in which IMHR is balanced by the natural tendency of the aromatic system to planarity. The contribution of H-n interactions between ¿^-protons and phenyl rings leads to an additional increase in intramolecular HH-distances, which in H4IP2+(PhSO3-)4 transcends the sum of hydrogen atoms van der Waals radii R (H).

The H4IP2+ platform, as well as H4P2+, possesses

molecular and anion receptor properties.1

[9,34-39]

Receptor

H4IP2+(PhSO3-)4 has accessible HB-donor NH-groups, which along with delocalized ring charge form two sites of H-bond-ing "guests" in complexes "double roost" type.[37] The internal weakly polar CH-group generates the inequality of these two binding sites. A porphyrin-type site with a pair of converging NH-groups is pre-arranged for synergistic hydrogen and electrostatic binding of the contact oxygen atom with the geometric configuration AX2E2, while the inverted site

with one NH-group is a monodentate. Inversion of pyrrole ring improves the complementarity of the porphyrin-type site of the receptor H4IP2+(PhSO3-)4 to the water molecule as compared to H4P2+(PhSO3-)4). This is indicated by the higher value of the charge transferred from the bound water molecule to the receptor, -0.160 and -0.139 (Mulliken charges), respectively, while for the inverted site this value is only -0.106. As a result, the total charge transferred from water molecules to the inverted receptor is slightly less (-0.266 and -0.279, respectively) and hardly influence on relative stability of the [H4IP2+(PhSO3-)4](H2O)2 complex as compared with [H4P2+(PhSO3-)4](H2O)2. This fact implied a total shift in the equilibrium of the H2I(i)P(PhSO3-)4 second protonation stage in water to the double aquacomplex, as well as for [H4P2+(PhSO3-)4](H2O)2.[3438]

Equilibria of H.J (i)P(PhSO 4-)4 Protonation with Perchloric Acid in Water

For protonation of H2I(i)P(PhSO3-)4 in water perchloric acid have been used, in which indifferent anion is not able to extrude water from aquacomplex [H4P2+(PhSO3-)4](H2O)2. [36] Acidification of the H2I(i)P(PhSO3-)4 aqueous solution is accompanied by a synchronous two-step response in the absorption and fluorescence (weak intensity) spectra (Figure 4(1)).

Analysis of the results showed the presence of two individual protolytic equilibria (1) and (2), with the own families of isosbestic points and linear parts on AA dependencies (Figure 4(2)), which strictly obey the equation (6) in the pH ranges 2.00-6.18 and 6.80-10.00, but are violated in the transition pH region 6.18-6.80, where three light-absorbing centers are simultaneously presented.

H2I(i)P(PhS03")4

H3I(e)P+(PhS03-}4

[H4IP2+(PhS03-)4l(H20)2

Figure 3. DFT-optimized geometry of inverted platform HjI(i)P(PhSO3")4 and its protonated forms (Tables 1, 2). meso-Substituents are omitted for clarity. Red dashed line - aromatic 18n-electron conjugated cycle. Gray dashed line - bifurcated IMHB.

o

</l

-Q <

Wavelength, nm

0.6 0.7 0.8 0.9 Absorbance (443 nm)

Figure 4. (1) - UV-Vis spectra of aqueous solutions H2I(1)P(PhSO3-)4 (red: 443; 552; 603 and 746 nm), 87 % H3I(e)P+(PhSO3-)4 in mixture with conjugated forms: (blue: 453; 567; 647 and 811 nm), [H4IP2+(PhSO3-)4](H2O)2 (green: 458; 599; 654 and 807 nm), (2) - correlation between absorbance at 443 nm and 458 nm (AA), (3) - titration curve at 458 nm.

H2Ia)P(PhSO3-)4 + H+ H3I(e)r(PhSO3-)4 (1)

Kn

H3I(e)P+(PhSO3-)4 + H+ [H4IP2+(PhSO3-)4](H2O)2 (2)

H3I(e)P+(PhSO3-)4+ H+ H4IP2+(PhSO3-)4

(3)

K

H4IP2+(PhSO3-)4 + 2H2O < wl'2 > [H4IP2+(PhSO3-)4](H2O)2

(4)

KB 2 = Kb2 ■ Kw1,2 • CH2O ( CH2O - concentration of water

in water)

A12 S2

(5)

(6)

_ A0(H2/(„P) + A0(H3I(„P+ ) ' Kb1 '10 "H

A 5 — ------+

1 + Kbi '10-pH + Kbi ' Kb2 '10

A0([H4IP2+ ](H2O)) ' Kbi ' KB2 '10 P

1 + Kb1 ' 10-pH + Kb1 ' KB2 '10-pH

PH

(7)

where A. - current value, A„. - absorbance of inverted

i ' 0i

porphyrin i-form solution with concentration Co on analytic wavelength X.

The protonation constants of the inverted platform H2I(i)P(PhSO3-)4 Kbl and KB2 (in literature KB2 is taken as Kb2) in water (Table 3) were calculated by fitting the parameters in equation (7) of the two-step titration curve (Figure 4(3)), as described for H2P(PhSO3-)4[38] as a constant CH2O (lgCH2O=1.74 mol/L for pure water at 25 0C) approxima-

Table 3. The reactions (1)-(4) constants in water and corresponding enthalpies, calculated in gaseous phase.

Compound lgKbl lgKB2 A^2 b2 wl,2 lgKbl - HK^,) H - H^u

H2P(PhSO3-)4[38] 4.85±0.03 4.71±0.03 1.22 -387.40 -330.51 -351.10 3.63 -36.30

H2l(i)P(PhSO3-)4 7.84±0.04; 5.57±0.06; 2.08 -399.34 -333.44 -349.55 5.76 -49.79

(7.7[2i])* (5.8[21])*

* - volume titration of H2IP(PhSO,Na)4 with methanesulfonic acid

tion. For H2I(i)P(PhSO3-)4 and H2P(PhSO3-)4 a good agreement between the constants of reactions (l)-(4), measured in water, and the corresponding DFT enthalpies, calculated in the absence of the medium (Table 3), was found

H2I(i)P(PhSO3-)4 is a stronger base and possesses a higher proton affinity, so protonation begins already in the alkaline pH region. A different diprotonation scheme for the inverted platform and the weaker aquacomplex [H4IP2+(PhSO3-)4](H2O)2 are the reasons for the increase in the difference between step enthalpies AHw-AHi2AHw 2, calculated without medium consideration and the corresponding protonation constants lgKw-lg(Kb2Kwl 2) in water. As a result, the anomalous proximity of the H2P(PhSO3-)4 stepwise diprotonation constants in water, due to the aqua-complex formation, is withdrawing for inverted derivative H2I(i)P(PhSO3-)4 and leads to appearing two clear steps on corresponding titration curves.

Aquacomplex [H4IP++(PhSO3-)4](H2O)2, resulting from the diprotonation of the inverted platform, is the monomer of supramolecular ./-aggregates self-assembly. The driving force of the /-aggregates self-assembly is the more stable anion complexes formation as a result of intermolecular substitution of the bound water molecules by the phenylsul-fonate groups (Figure 5).

Conclusions

1. In aqueous solution H2IP(PhSO3-)4 exists as NH-tautomer H2I(i)P(PhSO3-)4 with inverted pyrrolenine ring, stabilized by bifurcated IMHB between two pyrrole hydrogens and one pyrrolenine nitrogen. IMHB protects intramolecular centers of hydrogen bonding from intermolecular interactions.

2. Inversion of pyrrolenine ring leads to increasing of proton affinity, and, as a result, basicity of H2I(i)P(PhSO3-)4.

3. Sequence of protonation of main centers in the inverted platform H2IP(PhSO3-)4 is determined by intramolecular hydrogen bonds at the first protonation stage and intermolecular hydrogen bonds at the second protonation stage.

4. The H4IP2+(PhSO3-)4 diprotonated platform is elastic 1,3-alternate, which possesses anion and molecular receptor properties. Equilibrium of the H2I(i)P(PhSO3-)4 second protonation stage in water is total shifted to the aquacom-plex [H4IP2+(PhSO3-)4](H2O)2 formation due to hydrogen and electrostatic binding of solvent molecules at two receptor sites.

5. Aquacomplex [H4IP++(PhSO3-)4](H2O)2 is the monomer of supramolecular /-aggregates self-assembly. The driv-

Figure 5. Scheme of /-aggregates H4IP2+(PhSO3")4](H2O)2 self-assembly by intermolecular substitution of the bound water molecules by the phenylsulfonate groups.

ing force of the ./-aggregates self-assembly is more stable anion complexes formation as a result of intermolecular substitution of the bound water molecules by the phenylsul-fonate groups.

Acknowledgement. Presented work was supported by Russian Science Foundation (Project № 14-23-00204-P).

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Received 08.11.2018 Accepted 05.12.2018