Water confined in heterogeneous clay–quartz pores: Structure and dynamics from atomistic simulations

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Water confined in heterogeneous clay–quartz pores: Structure and dynamics from atomistic simulations

Colloids and Surfaces A: Physicochemical and Engineering Aspects. 2027. Vol. 752. Article 141756.

The molecular-scale behavior of water in heterogeneous clay–quartz systems is critical for understanding cementation processes in natural soils and compacted bentonite, which is crucial for oil recovery and nuclear waste disposal barriers construction. Here we investigate how heterogeneity of mixed Na-montmorillonite and α-quartz surfaces affect water structure and dynamics in nanopores of 2.5 to 60 Å in the presence of different surface functional groups. The results show that surface roughness alters water orientation and hydrogen bonding, with surface effects extending up to 15 Å. Water mobility is decreases with quartz addition in nano-channels due to strong surface hydrogen bond networks. For pores larger than 20 Å , the heterogeneous system behaves as a linear combination of its components, while smaller pores exhibit non-additive behavior due to the greater effect of short-range van der Waals interactions.

Research target: Chemistry Physics

Some Aspects of Remote State Restoring in State Transfer Governed by XXZ-Hamiltonian

Bochkin G., Doronin S., Fel’dman E. et al., Lobachevskii Journal of Mathematics 2024 Vol. 45 No. 3 P. 1188–1207

We consider the remote state restoring and perfect transfer of the zero-order coherence matrix (PTZ) in a spin system governed by the XXZ-Hamiltonian conserving the excitation number. The restoring tool is represented by several nonzero Larmor frequencies in the Hamiltonian. To simplify the analysis we use two approximating models including either step-wise or pulse-type time-dependence ...

Added: September 14, 2026

Coherence restoring in communication line via controlled interaction with environment

Fel’dman E. B., Лазарев И. Д., Pechen A. N. et al., Quantum Information Processing 2026 Vol. 25 Article 121

We consider the state-restoring protocol based on the controlled interaction of a linear chain with environment through incoherent control by the specially adjusted step-wise time-dependent Lindblad operators. We show that the best restoring result (maximal scale factors in the restored state) corresponds to the symmetrical Lindblad equation. (0, 1)-excitation dynamics is considered numerically, and restoring ...

Added: September 14, 2026

Macroscopic entanglement distribution with atomic ensembles

Li S., Hu J., Лазарев И. Д. et al., Annals of Physics 2026 Vol. 494 Article 170618

The distribution of entanglement is a crucial task for quantum communication towards realizing a globe-spanning quantum internet. Recently, a protocol for deterministic long-distance distribution of macroscopic entanglement over a network of ensembles of qubits was introduced (Pyrkov et al., 2025). It was shown that this protocol allows for the propagation of macroscopic amounts of entanglement ...

Added: September 14, 2026

Quantum Repeater Protocol for Deterministic Distribution of Macroscopic Entanglement, Advanced Quantum Technologies

Pyrkov A., Лазарев И. Д., Byrnes T., Advanced Quantum Technologies 2025 Article 2400524

Distributing long-distance entanglement is a fundamental goal that is necessary for a variety of tasks such as quantum communication, distributed quantum computing, and quantum metrology. Currently quantum repeater schemes typically aim to distribute one ebit at a time, the equivalent of one Bell pair's worth of entanglement. Here, a scheme is presented to distribute a ...

Added: September 14, 2026

Hybrid quantum-classical unsupervised data clustering based on the self-organizing feature map

I. D. Lazarev, Narozniak M., Byrnes T. et al., Physical Review A: Atomic, Molecular, and Optical physics 2025 Vol. 111 No. 012416 Article 012416

Unsupervised machine learning is one of the main techniques employed in artificial intelligence. We introduce an algorithm for quantum-assisted unsupervised data clustering using the self-organizing feature map, a type of artificial neural network. The complexity of our algorithm scales as 𝑂⁡(𝐿⁢𝑁), in comparison to the classical case which scales as 𝑂⁡(𝐿⁢𝑀⁢𝑁), where 𝑁 is the ...

Added: September 14, 2026

Coordination-driven assemblies of thioindigo and phthalocyanine chromophores: tuning optical absorption and magnetic interactions

Kolin N., Nazarov D., Krivenko K. et al., Dyes and Pigments 2026 Vol. 254 Article 113957

Interaction of thioindigo dianions with metal phthalocyanines, MPc, where M = MgII, MnII, AlIIICl and SiIVCl2, in the presence of cryptand[2.2.2] produces anionic and neutral complexes: {Crypt(K+)}2{(trans-thioindigo2−)⋅(MgIIPc)2}2−⋅2C6H4Cl2 (1); {Crypt(Cs+)}2{(trans-thioindigo2−)⋅(MnIIPc)2}2− (2), {Crypt(K+)}{(cis-Hthioindigo−)2⋅(AlIIIPc)}− (3) and {(cis-Hthioindigo−)2⋅(SiIVPc)} (4). Bidentate thioindigo2− ligand forms symmetric binuclear dimers in 1 and 2 with short M-O(thioindigo2−) bonds of 1.899(2) and 1.984(6) Å length for ...

Added: September 14, 2026

Doubly Reduced Phthalocyanine Complexes of V(IV), Cu(II), and Sn(II): Synthesis, Structure, and Spin Dynamics

Faraonov M., Romanenko N., Ivanov T. et al., Dalton Transactions 2026 Vol. 55 No. 24 P. 9428–9438

Doubly reduced phthalocyanine complexes remain largely unexplored despite their potential relevance for molecular spin-based applications. Herein, we report the synthesis of a series of crystalline complexes, {cryptand(Cs + )} 2 [M(Pc) 4– ] 2–. ...

Added: September 14, 2026

Binuclear and trinuclear 3d-metal complexes of HATNA and HAT(CN)6 with unique magnetic behavior: from extremely strong antiferromagnetic coupling to opposite sign of zero-field splitting in the same complex

Mikhailenko M., Astakhova T., Timokhina E. N. et al., Inorganic Chemistry Frontiers 2026 Vol. 13 No. 14 P. 6145–6156

series of anionic bi- and trinuclear complexes of Co II , Fe II , and Mn II with hexaazatrinaphthylene (HATNA) and hexaazatriphenylenehexacarbonitrile (HAT(CN) 6 ), incorporating paramagnetic Cp* 2 Fe + cations ( S = 1/2), were obtained and investigated. ...

Added: September 14, 2026

1D and 2D coordination polymers based on ring-reduced freebase and copper-containing meso-tetra(4-pyridyl)porphyrins and M(III) (TMHD) 3 units (M = Dy, Tb and Gd; TMHD: 2,2,6,6-tetramethyl-3,5-heptanedionate)

Nazaro D. I., Yakushev I. A., Kuzmin A. V. et al., Inorganic Chemistry Frontiers 2026 Vol. 13 No. 11 P. 5039–5050

Reduced tetra(4-pyridyl)porphyrins (H 2 TPyP and Cu II TPyP) form polymers with M III (TMHD) 3 (M = Dy, Tb and Gd). Folded zigzag 2D and linear 1D polymers are obtained. Their structure, optical and magnetic properties are investigated. ...

Added: September 14, 2026

Singlet–Triplet Transitions in the Dianionic Complex of Fullerene C 60 with Iron Carbonyl: (TBA + ) 2 {[Fe 2 (CO) 6 ]-η 2 ,η 2 -C 60 } 2–

Sobov P. A., Yakushev I. A., Shestakov A. et al., Inorganic Chemistry 2026 Vol. 65 No. 16 P. 9107–9115

Interaction of fullerene C60 with Cs2Fe(CO)4 in the presence of two equivalents of tetrabutylammonium iodide (TBAI) yields the first dianionic coordination complex of fullerene: (TBA+)2{[Fe2(CO)6]-η2,η2-C60}2– (1). According to magnetic data and DFT calculations, complex 1 has a diamagnetic ground (S = 0) and a triplet excited state (S = 1) populated above 80 K. As ...

Added: September 14, 2026

Crystalline Trinuclear Exo- and Endocyclic Complexes of a Tetrapyrazinoporphyrazine Ligand with 3 d - and 4 f -Metals

Faraonov M., Romanenko N., Ivanov T. et al., Crystal Growth & Design 2026 Vol. 26 No. 7 P. 2792–2801

A redox-active tetrapyrazinoporphyrazine ligand was used as a platform for the design of multimetallic coordination complexes. The first paramagnetic homo- and heterotrimetallic complexes have been obtained as crystals through the reaction of iron(II) octaethyltetrapyrazinoporphyrazine, FeII(Et8TPyzPz), with 3d- (FeII, CoII) and 4f-metal (DyIII) iodides. In these conditions, tetrapyrazinoporphyrazine can coordinate to metals to form exo- and ...

Added: September 14, 2026

Complex of fullerene C60 with partial charge transfer: {(dppf)CpFe(CO)}+(C60)-⋅C6H4Cl2 (δ = 0.54–0.86), where dppf is bis(diphenylphosphino)ferrocene ligand

Sobov P. A., Khasanov S., Kuzmin A. V. et al., Inorganic Chemistry Communications 2026 Vol. 185 Article 116055

New complex {(dppf)CpFe(CO)}(C60)⋅C6H4Cl2 (1) was obtained when stoichiometric mixture of C60 and CoII(dppf)Cl2 is reduced by two equivalents of (Cs+){CpFe(CO)2−} (dppf: 1,1`-bis(diphenylphosphino)ferrocene). CpFe(CO)2− anion reduces CoII(dppf)Cl2 and CpFe(CO)2 abstracts the dppf ligand from Co(dppf) forming (dppf)CpFeI(CO). Electron transfer from (dppf)CpFeI(CO) to C60 is observed. As a result, the state of {(dppf)CpFe(CO)}δ+(C60)δ−⋅C6H4Cl2 (δ = 0.54–0.86) is intermediate between ...

Added: September 14, 2026

Mono- and binuclear complexes of iron(II) and cobalt(II) with deprotonated trans-indigo anions. Effect of cationic surrounding on structure and magnetic properties.

Krivenko K., Kuzmin A. V., Mikhailenko M. et al., Dyes and Pigments 2026 Vol. 246 Article 113342

Mono- and binuclear complexes of FeII and CoII with deprotonated trans-indigo were obtained. Reduction of indigo by metallic iron in the presence of crystal violet (CV) yields (CV+)[(FeCl2)HIndigo]−⋅C6H4Cl2 (1). The reaction of FeI2 and CoI2 with one equivalent of decamethylchromocene (Cp∗2Cr) and one or half equivalent of indigo yields mononuclear (Cp∗2Cr+)[(CoI2)HIndigo]−⋅C6H4Cl2 (2), (Cp∗2Cr+)[(FeI2)HIndigo]−⋅ xC6H4Cl2, where ...

Added: September 14, 2026

A 36-Nuclear Wheel-Shaped Heterometallic Cluster: Self-Assembly of Mixed-Valent Pt II /Pt IV and Mn II Centers

Sosunov E., Skabitsky I. V., Churakov A. et al., Crystal Growth & Design 2026 Vol. 26 No. 4 P. 1775–1782

Polynuclear 5d–3d assemblies represent a promising class of systems for exploring the interplay among electronic structure, magnetism, and self-assembly. Here, we report the synthesis and structural characterization of the first heterometallic wheel-shaped Pt–Mn cluster, [PtIV12PtII6Mn18(OAc)72(μ3-O)12]·43C6H6(1), which incorporates 36 metal centers. The giant ring is constructed from alternating PtIIMnII paddlewheel fragments and PtIV2Mn2 oxo-acetate units, bridged ...

Added: September 14, 2026

Effect of the size of the substituents in triptycene (TPC-X) on the magnetic and conducting properties of the layered 2D organic metals (MDABCO+)(C60•−)·(TPC-X), where X = H, Br, and I

Sobov P. A., Kuzmin A. V., Shevchun A. F. et al., Synthetic Metals 2025 Vol. 313 Article 117904

Modification of the neutral triptycene TPC-X molecule by increasing the size of the X substituent at the 9th position from X = H to Br and I affects the magnetic and conducting properties of the (MDABCO+)(C60•−)(TPC-X) salts (1–3, respectively), where MDABCO+ is N-methyldiazabicyclooctanium. These salts feature hexagonal fullerene layers composed of C60•−, which remain undimerized owing to ...

Added: September 14, 2026

Salts of Tetraselenatetracene and Bis(ethylenedithio)tetrathiafulvalene with Metal Hexafluoroacetylacetonate Anions: MnII(hfac)3–, CoII(hfac)2Cl–, and PrIII(hfac)4–

Flakina A. M., Nazarov D., Faraonov M. et al., Crystal Growth & Design 2025 Vol. 25 No. 15 P. 6332–6344

Oxidation of tetraselenatetracene (TSeT) and bis(ethylenedithio)tetrathiafulvalene (BEDT-TTF) by p-chloranil in the presence of metal hexafluoroacetylacetonates: MnII(hfac)2, CoII(hfac)2 and PrIII(hfac)3 followed by precipitation of crystals by n-hexane produces (TSeT1.5)+{MnII(hfac)3–} (1), (TSeT1.5)+{PrIII(hfac)4–} (3), (TSeT2)+{CoII(hfac)2Cl–} (4), and (ET3)+{MnII(hfac)3–} (5). Thioindigo dye is introduced into (TSeT1.5)+ (Thioindigo1.5){MnII(hfac)3–} (2) due to the appearance of specific C═O···(Se–Se bond) interactions accompanied by ...

Added: September 14, 2026

Complex of copper(II) hexafluoroacetylacetonate with photochromic spiropyran in the merocyanine form: Field-induced slow magnetic relaxation and quantum coherence for Cu(II) (S = 1/2) and photoswitching of spiropyran ligand

Osipov N., Faraonov M., Yakushev I. A. et al., Dalton Transactions 2025 Vol. 54 No. 32 P. 12180–12188

The interaction of photochromic 8-methoxy-1′,3′,3′-trimethyl-6-nitro-spiro[chromene-2,2′-indole] (MNSP) spiropyran with copper(II) hexafluoroacetylacetonate yields a deep red–violet solution due to a coordination-induced transition of MNSP from its closed form to the colored, open merocyanine (MC) form. The crystal structure of {CuII(hfac)2·MNSP} (1) shows coordination of two oxygen atoms in MNSP to CuII, forming a distorted octahedral geometry with ...

Added: September 14, 2026

Complexes of d‐ and f‐metal Ions with Redox‐Active and Highly Symmetric Truxenone Ligand: Effect of Cations and Coordination on Distortions of Radical Anions and Singlet–Triplet Transition in Dianions

Krivenko K., Shestakov A., Faraonov M. et al., European Journal of Inorganic Chemistry 2025 Vol. 28 No. 14 Article e202400760

Truxenone (Tr) with high C3h symmetry forms crystalline radical anion and dianion salts. The {Bu3MeP+}(Tr⋅−) (1) and {Cp*2Co+)}(Tr⋅−)⋅2 C6H4Cl2 (2) show intense low‐energy absorption up to 2000 nm. Calculations predict Jahn–Teller distortions for Tr⋅−, which are enhanced by the asymmetric approach of cations to Tr⋅−, leading to C=O bond length alternation and EPR signal asymmetry in 2. ...

Added: September 14, 2026

Complexes (TBA+){(TMI-NPS)2·LnIIII4}− (Ln = Dy, Tb) with two axial photochromic spiropyran ligands: photoswitching and zero-field SIM behaviour with a high magnetization blocking barrier for the Dy complex

Osipov N., Faraonov M., Kuzmin A. V. et al., Inorganic Chemistry Frontiers 2025 Vol. 12 No. 5 P. 2092–2102

Two photochromic spiropyran molecules (1,3,3-trimethylindolino-β-naphthopyrylospiran, TMI-NPS) react in the open form with LnIII iodides (Ln = Dy, Tb) to form in the presence of TBAI crystalline (TBA+){(TMI-NPS)2·LnIIII4}−·0.5C6H4Cl2 (1 and 2, respectively). Two TMI-NPS ligands are coordinated to lanthanides (Ln) by oxygen atoms at the axial position, and four iodide anions located at the equatorial position ...

Added: September 14, 2026

Macrocycle- and metal-centered reduction of cobalt trithiadodecaazahexaphyrin (Hhp). Metal-to-ligand charge transfer in {(Co(I)2Co(II)O){Hhp(•4-))}(2-)

Nazarov D., Kuzmin A. V., Islyaikin M. et al., New Journal of Chemistry 2025 Vol. 49 No. 5 P. 1631–1639

Reduction of free-base trithiadodecaazahexaphyrin, H3Hhp, by potassium graphite in the presence of cobalt(II) acetylacetonate and cryptand[2.2.2] produces {Cryptand[2.2.2](K+)}2{(CoI2CoIIO)2+(Hhp˙4−)}2−·2C6H4Cl2 (1). Co atoms in Co3O have square-planar geometry with short Co–N and Co–O bonds of 1.852–1.898(3) Å length. A nearly planar shape of Hhp macrocycles in 1 with equal Nmeso–C bonds indicates the aromatic character of Hhp˙4−. ...

Added: September 14, 2026

Coordination complexes of iron(II) phthalocyanine with cationic, anionic and neutral ligands

Romanenko N., Faraonov M., Kuzmin A. V. et al., Journal of Porphyrins and Phthalocyanines 2024 Vol. 28 No. 09n10 P. A–k

A series of coordination complexes of iron(II) phthalocyanine (FeIIPc) with anionic, cationic and neutral ligands has been obtained in crystalline form. The salt of FeIIPc with MDABCO[Formula: see text] cations (MDABCO[Formula: see text][FeI(Pc[Formula: see text]][Formula: see text]⋅(I[Formula: see text]⋅2TPC⋅2C6H4Cl2 (1) contains FeIIPc reduced to [FeI(Pc[Formula: see text]][Formula: see text], and the FeI ion coordinates two ...

Added: September 14, 2026

Binuclear Coordination Assemblies of Metal Tetraphenylporphyrins (M = Mn, Fe, and In) with Anionic Thioindigo Bridges as Promising Magnetic Systems with Tunable Properties

Nazarov D., Faraonov M., Nations S. et al., Inorganic Chemistry 2024 Vol. 63 No. 48 P. 22677–22687

A series of hybrids comprising two metal (Mn, Fe, and In) tetraphenylporphyrins axially substituted with anionic bidentate trans-thioindigo ligands (TI) were obtained. Substitution of the axial chloride anion by an oxygen atom of the dye forms short M–O bonds. Crystalline binuclear assemblies (TI•–)·{[MnIITPP]0·[MnIIITPP]+}·xC6H4Cl2 (x = 2 for 1 or 1 for 2) and (TI2–){[MIIITPP]+}2·xC6H4Cl2 (M ...

Added: September 14, 2026

Effect of nuclearity and reduction state of the central ligand on magnetic properties of hexaazatrinaphthylene-based cobalt(ii) and iron(ii) complexes: from extremely weak to record-breaking antiferromagnetic exchange interaction

Mikhailenko M., Ivanov V. V., Faraonov M. et al., Inorganic Chemistry Frontiers 2024 Vol. 11 No. 21 P. 7563–7575

A series of hexaazatrinaphthylene (HATNA) and hexaazatrianthracene (HATA) complexes with high-spin four-coordinate cobalt(II) (S = 3/2) and iron(II) (S = 2) ions were synthesized. These compounds vary in charge of the central hexaazatriphenylene (HAT) ligand (L) and the number of coordinated metal atoms. The occupancy of the three coordinating sites on the HAT ligands greatly ...

Added: September 14, 2026

Single-Ion Magnetism of the [DyIII(hfac)4]− Anions in the Crystalline Semiconductor {TSeT1.5}●+[DyIII(hfac)4]− Containing Weakly Dimerized Stacks of Tetraselenatetracene

Flakina A. M., Nazarov D., Faraonov M. et al., International Journal of Molecular Sciences 2024 Vol. 25 No. 15 Article 8068

The oxidation of tetraselenatetracene (TSeT) by tetracyanoquinodimethane in the presence of dysprosium(III) tris(hexafluoroacetylacetonate), DyIII(hfac)3, produces black crystals of {TSeT1.5}●+[DyIII(hfac)4]− (1) salt, which combines conducting and magnetic sublattices. It contains one-dimensional stacks composed of partially oxidized TSeT molecules (formal averaged charge is +2/3). Dimers and monomers can be outlined within these stacks with charge and spin ...

Added: September 14, 2026