Synthesis and Solid-State Structure of Cyclobutyltellurium(IV)-Containing Dimeric Tungstoarsenates(III)

The cage-like cyclobutyltellurium(IV)-containing tungstoarsenate(III) dimers [(C₄H₈Te-OH)₂(C₄H₈Te)₆{As₂W₁₇O₆₁(H₂O)}₂]^14? (1) and [{(C₄H₈Te)₂W₂O₅(H₂O)₂As₂W₁₉O₆₇(H₂O)}₂]^16? (2) were synthesized in moderately acidic aqueous medium by reaction of C₄H₈TeI₂ with the lacunary tungstoarsenates(III) [B-α-AsW₉O₃₃]^9? and [As₂W₁₉O₆₇(H₂O)]^14?, respectively. Polyanion 1 was isolated as a mixed cesium-guanidinium salt Cs_8.5(C(NH₂)₃)_5.5[(C₄H₈TeOH)₂(C₄H₈Te)₆{As₂W₁₇O₆₁(H₂O)}₂]·60H₂O (1a), whereas 2 crystallized as a mixed cesium-potassium salt Cs₉K₇[{(C₄H₈Te)₂W₂O₅(H₂O)₂As₂W₁₉O₆₇(H₂O)}₂]·90H₂O (2a). Single crystal X-ray analysis demonstrated that 1a and 2a crystallized in the triclinic space group \( P \bar{1} \), with a = 12.7738(8) Å, b = 18.7490(14) Å, c = 21.9831(14) Å, α = 111.155(4)^o, β = 93.312(3)^o, γ = 99.530(4) and Z = 1 for 1a and a = 19.309(6) Å, b = 24.674(8) Å, c = 26.071(8) Å, α = 63.218(17)°, β = 89.26(16)^°, γ = 79.948(17)^° and Z = 2 for 2a. The polyanion salts 1a and 2a were characterized by solid state NMR (¹H, ¹³C, ¹²⁵Te), FT-IR, TGA-DSC, and elemental analysis.     

Co(II) and Ni(II) complexes with imidazole-containing ligands: Synthesis,structural characterization,and magnetic property

Hydrothermal reaction of Co(II) salt with 1,4-di(1-imidazolyl)benzene (L¹) and 4,4’-oxydiphthalic acid (H₄OA) yields a new complex [Co₃(HOA)₂(L¹)₄(H₂O)₄] (I). [Ni(L²)₂SO₄] · 0.5H₂O (II) can be obtained via the hydrothermal reaction of NiSO₄ · 6H₂O with 1,3-di(1H-imidazol-4-yl)benzene (L²). Complexes I and II have been characterized by single-crystal and powder X-ray diffraction (CIF files CCDC nos. 1019291 (I) and 1019292 (II)), IR, elemental, and thermogravimetric analyses. Complex I exhibits the uninodal six-connected 3D pcu framework structure of I with (4¹² · 6³) topology; Complex II consists of the uninodal four-connected 2D sql (4⁴ · 6²) networks. In addition, magnetic property of I was investigated.     

The Hybrid Organic–Inorganic Assemblies Based on Monocapped Trivacant Keggin Arsenatomolybdate and Cu<Superscript>I</Superscript>-Organic Units

A new arsenomolybdate compound [Cu(imi)₂]₅Na[(AsO₄)Mo₉O₂₇(AsO₃)]·5H₂O(imi = imidazole) 1, has been prepared by hydrothermal method and structurally characterized by elemental analysis, IR, XRD, TG analysis and single-crystal X-ray diffraction analysis. Compound 1 represents the first example of monocapped trivacant Keggin [As^IIIAs^VMo₉O₃₄]^6? subunit as polydentate ligand bonded to five [Cu(imi)₂] complexes through one covalent bond and four weak Cu···O bonds. The electrochemical behavior of 1-modified carbon paste electrode has been studied in detail. In addition, photoluminescence and photocatalysis properties of 1 have been investigated.     

Polyoxometalate-based supramolecular hybrids composed of Cu/2, 2′-dimethyl-4, 4′-bithiazole fragments extended via non-bonding S···O interactions

Four polyoxometalate-based complexes, namely [Cu^I(dm4bt)₂]₃[PMo₁₂O₄₀] (1), H₂[Cu^I(dm4bt)₂]₂{[Cu ₂ ^I (dm4bt)₃]₂[SiW₁₂O₄₀]}[SiW₁₂O₄₀] (2), [Cu^I(dm4bt)₂]₅ {[Cu^I(dm4bt)][P₂W₁₈O₆₂]} (3) and {Cu ₂ ^II (dm4bt)₂[Mo₆O₂₀]} (4) (dm4bt = 2,2′-dimethyl-4,4′-bithiazole), were synthesized hydrothermally from copper nitrate and various polyoxoanions. X-ray crystal structural analysis reveals that all four complexes have supramolecular structures, in which the dm4bt ligands coordinate with the Cu atoms to give different Cu/dm4bt fragments, which are further connected into supramolecular structures via non-bonding S···O interactions between Cu/dm4bt fragments and polyoxoanions. The crystal structures also reveal the crucial role of S···O interactions in the packing structures of complexes 1–4. The electrochemical and electrocatalytic properties of 1–3 with respect to bromate reduction were investigated.     

Cobalt(II) complexes with pentadentate Schiff bases 2,6-diacetylpyridine hydrazones: Syntheses and structures

Seven new cobalt(II) complexes based on the Schiff bases, 2,6-diacetylpyridine bis(isonicotinoylhydrazone) (H₂L¹) and 2,6-diacetylpyridine bis(nicotinoylhydrazone) (H₂L²), are synthesized and studied by X-ray diffraction analysis: [Co(H₂L¹)(NCS)₂] · 2.25H₂O (I), [Co(H₂L²)(NCS)₂] · CH₃OH (II), [Co(H₂L²)(NCS)(H₂O)]NCS (III), [Co(H₄L¹)(NCS)₂](NO₃)₂ · 2H₂O (IV), [Co(H₄L¹)(NCS)₂][Co(NCS)₄] · 0.75H₂O (V), [Co(H₄L²)(NCS)₂][Co(NCS)₄] · 1.75H₂O (VI), and [Co(H₂L²)(NCS)(CH₃OH)]₂[Co(NCS)₄] · 2CH₃OH (VII) (CIF files CCDC 941186 (I), 1457906 (Ia), 1457905 (II), 941187 (III), 1457907 (IV), 1457908 (V), 1457909 (VI), and 941188 (VII)). The organic ligands in the complexes act as pentadentate neutral H₂L or doubly protonated (H₄L)²⁺ coordinated through the same set of donor atoms N₃O₂. In all compounds I–VII, the coordination polyhedron of the Co²⁺ ion in a complex with the Schiff bases has a shape of a pentagonal bipyramid. The hydrazones are arranged in the equatorial plane of the bipyramid. Its axial vertices are occupied by the nitrogen atoms of the NCS￣ anions in compounds I, II, and IV–VI and by the nitrogen atoms of NCS￣ and oxygen of the water molecule in compound III or methanol in compound VII. The NO ₃ ^- anions or [Co(NCS)₄]^2￣ complex anions obtained by the reactions are involved along with the NCS￣ anions in the formation of compounds IV–VII.     

Cobalt—Sandwiched lindqvist hexaniobate dimer [Co(III)H<Subscript>5</Subscript>(Nb<Subscript>6</Subscript>O<Subscript>19</Subscript>)<Subscript>2</Subscript>]<Superscript>8− 1</Superscript>

A new polyoxoniobate K₆Na₂[Co_IIIH₅(Nb₆O₁₉)₂] · 26.5H₂O (I) has been synthesized by a diffusion strategy and structurally characterized by IR spectrum, UV spectroscopy, TG analysis, and single crystal X-ray diffraction. Compound I crystallizes in the cubic Pa \(\bar 3\) space group with a = 17.969(8)Å V = 5802.6(4) ų, Z = 4, R ₁ = 0.0383 and wR ₂ = 0.1187. Compound I consists of the Lindqvist hexaniobate dimer [Co_IIIH₅(Nb₆O₁₉)₂]^8? in which the Co³⁺ cations sare andwiched between and face-shared with two Lindqvist-type [Nb₆O₁₉]^8? subunits. In situ UV spectra display that compound I can stably exist in an aqueous solution.     

One Novel 3D Supramolecular Network Based on Dicobalt-Carboxylate Secondary Building Units with Polycarboxylate Ligands 1, 2, 3, 4-Butanetetracarboxylic Acid

A novel cobalt–carboxylate framework constructed from secondary building units (SBUs), {[Co₁₆(btca)₈(H₂O)₄₀]·16H₂O}_n (1) (H₄btca = 1,2,3,4-butanetetracarboxylic acid) has been hydrothermally synthesized and characterized by techniques of single-crystal X-ray diffraction analyses, elemental analyses, infrared spectra, powder X-ray diffraction and thermogravimetric analyses. The complex exhibits 2D 4-connected sql net with (4⁴ × 6²) topology symbol built from [Co₂(COO)₄(H₂O)₅] SBUs and is further extended into a 3D supramolecular architecture via strong O–H···O hydrogen bonds. Moreover, the magnetic measurements indicate complex 1 exhibit antiferromagnetic behavior.     

Peroxide derivatives of heteropoly compounds with Keggin anions [PW<Subscript>12</Subscript>O<Subscript>40</Subscript>]<Superscript>3−</Superscript> and [SiW<Subscript>12</Subscript>O<Subscript>40</Subscript>]<Superscript>4−</Superscript>: Synthesis and structure

Peroxide derivatives of heteropoly compounds with Keggin anions [PW₁₂O₄₀]^3? and [SiW₁₂O₄₀]^4? are isolated in an individual state from concentrated hydrogen peroxide solutions and characterized by physicochemical methods. The structure of Ba₂[SiW₁₂O₄₀] · 4H₂O₂ · 11H₂O (I) is solved by X-ray crystallography. Crystals of compound I (H₃₀Ba₂O₅₉Si₁W₁₂, FW = 3483.21) are monoclinic, space group C2/c, a = 24.981(2) Å, b = 12.2103(11) Å, c = 18.7142(17) Å, β = 122.620(2)^o, V = 4808.0(8) ų, Z = 4. The structure contains Keggin anions [SiW₁₂O₄₀]^4?; all hydrogen peroxide molecules are coordinated to Ba²⁺ cations.     

Coherence assembly phenomenon in the typical structures of heteropolyniobates

Crystallographic analysis has provided evidence for single cation frameworks formed from preordered cation positions in the individual building blocks (modules) constituting the basis of structures. We propose to call this phenomenon coherence assembly. According to the mechanical wave concept of the crystalline state, coherence assembly dictates the rules of mutual packing of “rigid” structural fragments. This study investigates the typical structures of heteropolyniobates: Na₁₂[Ti₂O₂][SiNb₁₂O₄₀]·4H₂O (I), menezesite Ba₂MgZr₄[BaNb₁₂O₄₂]·12H₂O (II), and the menezesite-isostructural aspedamite □₁₂(Fe³⁺,Fe²⁺)₃Nb₄·[Th(Nb,Fe³⁺)₁₂O₄₂]·(H₂O,OH)₁₂ (III).     

Coordination assemblies of rigid–flexible 1,3-bis(5-(pyridine-2-yl)-1,2,4-triazole-3-yl)propane ligands with MCl<Subscript>2</Subscript> (M = Fe,Co, Cu or Zn): structural diversity and mass spectra

Reactions of the rigid–flexible N-heterocycle 1,3-bis(5-(pyridine-2-yl)-1,2,4-triazole-3-yl) propane (H₂L) with MCl₂ (M = Fe, Co, Cu or Zn) gave coordination complexes, {[Fe ₂ ^III Cl₄(H₂L)₂]·2Cl}·EtOH·H₂O (1), {[Co₃Cl₅(HL)]·H₂O} _n (2), {[Co₄Cl₄(H₂L)₂(H₂O)₄]·[CoCl₄]₂}·H₂O (3), [Cu₂Cl₃(HL)(H₂O)]₆·5H₂O (4), [Cu ₂ ^II Cu^ICl₄(HL)] _n (5), {[Zn₂Cl₂(L)H₂O]·H₂O} _n (6) and [Zn₄Cl₆(HL)₂] (7), which have been characterized by single-crystal X-ray diffraction. Structural analysis reveals that the pyridine triazole ligand attains versatile coordination modes in these complexes. Complexes 1, 3, 4 and 7 consist of 0D clusters with binuclear or tetranuclear units; complex 2 presents a 2D network accompanied by HL^? and chloride bridges; complexes 5 and 6 show 1D chains with [Cu₃] and [Zn₂] subunits. In addition, the electrospray ionization mass spectrometry properties of selected complexes were investigated, revealing the stabilities and structural states of these complexes in solution. These results indicate that H₂L is an excellent multiconnection linker for the construction of diverse coordination complexes.     

Homo- and heteronuclear iron complexes {Fe<Subscript>2</Subscript>MO} with salicylic acid: Synthesis,structures, and physicochemical properties

A reaction of iron nitrate with magnesium salicylate and reactions of iron and cobalt chlorides with ammonium salicylate in the presence of water, methanol, DMAA, and DMF gave the trinuclear heterometallic complexes: [hexa-μ-salicylato-μ₃-oxo-0.4-dimethylacetamide-2.6-aquadiiron(III)magnesium(II)] tetra(dimethylacetamide), [Fe₂MgO(SalH)₆(DMAA)_0.4(H₂O)_2.6]·4DMAA (I); [hexa-μ]-salicylato-μ₃-oxo(dimethanol)aquadiiron(III)cobalt(II)] dimethylformamide · 2.5-hydrate, [Fe₂CoO(SalH)₆(CH₃OH)₂(H₂O)] · DMF · 2.5H₂O (II); and [hexa-μ-salicylato-μ₃-oxotriaquatriiron(III)] chloride dimethylacetamide monohydrate, [Fe₃O(SalH)₆(H₂O)₃]Cl · DMAA · H₂O (III). The X-ray study revealed that the molecular structures of complexes I and II are [Fe₂ ^IIIM^II(μ₃-O)(RCOO)₆L₃] · nSolv. The IR and Mössbauer spectra of complexes I–III were examined; their magnetochemical and thermal properties were studied. The parameters of the Mössbauer spectra (δ_Na ⁺ = 0.69 ± 0.03 mm/s, ΔE _Q = 0.76–1.08 mm/s, 300 K) suggest the high-spin state of the Fe³⁺ ions in complexes I–III (S = 5/2). The paramagnetic Fe³⁺ ions are involved in antiferromagnetic exchange interactions with the parameter J = ?44 cm^?1, g = 2.05 (for I). Complexes I–III are thermally unstable.     

A polyoxoniobate based on dimeric hexanionbate: [Cu(en)2]4{[Nb6O19H2]K(H2O)5}2 · (H2en) · 17H2O

A polyoxoniobate, [Cu(en)₂]₄{[Nb₆O₁₉H₂]K(H₂O)₅}₂ ? (H₂en) ? 17H₂O (en = ethylenediamine) (1), has been synthesized and characterized by elemental analysis, IR, XPS, TGA, and single-crystal X-ray diffraction. Compound 1 crystallizes in the triclinic system, space group P 1, with a = 12.3533(16) Å, b = 12.7188(16) Å, c = 29.626(4) Å, α = 93.235(2)°, β = 96.094(1)°, γ = 106.098(2)°, V = 4429.0(10) ų, Z = 2. The polyoxoanion is composed of a Lindqvist-type [Nb₆O₁₉H₂]^6? dimer bi-bridged via two K⁺. K⁺ is 10-coordinate with 10 oxygens, three from one [Nb₆O₁₉H₂]^6?, one from a terminal oxygen of another [Nb₆O₁₉H₂]^6? moiety, and the other six from water molecule. Adjacent dimeric polyoxoanions are linked to form an infinite 1-D chain via O–H ··· O hydrogen-bonding interactions which exist between the two water trimers and the dimeric polyoxoanions.     

A New Three-Dimensional Framework Based on K<Subscript>2</Subscript>Zr<Subscript>3</Subscript>-Substituted Sandwich-Type Polyoxometalate Clusters and K–O Chains

A new Zr-substituted sandwich-type polyoxometalate, H₈K₃[Zr₃K₂(μ₃-O)₂(μ₂-OH)(H₂O)₂(A-α-PW₉O₃₄)₂]·2Cl^?·7H₂O (1), has been made under hydrothermal conditions. 1 was characterized by IR spectrum, thermogravimetric analysis, powder X-ray diffraction and single-crystal X-ray diffraction, respectively. Crystal data for 1: tetragonal space group P4₂2₁2, a = 24.0096(3), b = 24.0096(3), c = 14.7416(3) Å, V = 8498.0(2) Å³ and Z = 4. Single crystal X-ray structure analysis reveals that 1 exhibits a three-dimensional framework structure based on Zr₃K₂-substituted sandwich-type polyanions [Zr₃K₂(μ₃-O)₂(μ₂-OH)(H₂O)₂(PW₉O₃₄)₂]^9? linked by K–O chains. UV–Vis spectrum indicates that 1 is a wide-gap semiconductor. In addition, the SHG of 1 was also investigated.     

Three metal complexes based on tetrazolyl ligands: Hydrothermal syntheses,crystal structures,and fluorescence properties

Three new complexes based on 1-tetrazole-4-imidazole-benzene (Tibz), namely, [Cd(Tibz)₂(H₂O)₂] _n (I), [Mn(Tibz)₂(H₂O)₄] · 2H₂O (II) and [Co(Tibz)₂(H₂O)₄] · 2H₂O (III) have been synthesized through hydrothermal method and structurally characterized by element analyses, IR spectroscopy and single-crystal X-ray diffraction analyses (CIF files CCDC nos. 1443867 (I), 1443868 (II), 1443869 (III)). Single-crystal X-ray diffraction reveals that complex I is a 1D double-chain architecture, II and III are both mononuclear complexes. The results of single-crystal X-ray diffraction analyses indicate that the hydrogen bond and π··· π stacking exist in the complexes, which make great contribution to the stabilities of complexes I–III. The fluorescent properties of these complexes have also been studied in the solid state at room temperature.     

Synthesis,crystal structures,and luminescent properties of three cluster-based heterometallic and monometallic compounds

Two heterometallic cluster compounds and one monometallic cluster compound, namely [Ni₉Co₆(PMIDA)₆(BTC)₂(H₂O)₁₂]·6H₂O (1), [Co₁₃Zn₂(PMIDA)₆(H₂O)₁₈]·6NO₃·15H₂O (2), and [Fe₁₅(PMIDA)₆(BTC)₂(H₂O)₂₂]·38H₂O (3), have been obtained under hydrothermal conditions using N-(phosphonomethyl)imino-diacetic acid (H₄PMIDA) and 1,3,5-benzenetricarboxylate acid (H₃BTC) as ligands, and structurally characterized by X-ray crystallography. Compound 1 exhibits a 3D open framework constructed from [Ni₉Co₆(PMIDA)₆(H₂O)₁₂]⁶⁺ heteronuclear clusters and BTC^3? ligands. Compounds 2 and 3 are both zero-dimensional polynuclear clusters, further extended into 3D supramolecular structures via hydrogen-bonding interactions. However, there are some differences in their crystal structures; compound 2 features an isolated spherical heteronuclear cation cluster based on PMIDA^4? ligands, such that the NO₃ ^? anions only balance the charge, whereas compound 3 is characterized as a neutral monometallic cluster incorporating two different types of organic acid ligands, namely PMIDA^4? and BTC^3?, and the two BTC^3? ligands exhibit regular distribution in each cluster. The luminescence properties of all three compounds have been investigated at room temperature.     

Synthesis and crystal structure of supramolecular compounds of cucurbituryl with the chalcocyanide cluster complex [Re<Subscript>4</Subscript>Te<Subscript>4</Subscript>(CN)<Subscript>12</Subscript>]<Superscript>4−</Superscript> and a manganese(II) aqua complex

Supramolecular compounds [Mn(H₂O)₄(C₃₆H₃₆N₂₄O₁₂)]₂[Re₄Te₄(CN)₁₂]·12.5H₂O (1), (H₃O)₂[{Mn(H₂O)₄ (C₃₆H₃₆N₂₄O₁₂)}{Mn(H₂O)₄} ₂{Re₄Te₄(CN)₁₂}₂]·3.5H₂O (2) and [{Mn(H₂O)₃Cl} ₂(C₃₆H₃₆N₂₄O₁₂)]Cl₂·6H₂O (3) were obtained by crystallization at room temperature from water solutions containing macrocyclic cavitand cucurbituryl (C₃₆H₃₆N₂₄O₁₂), aqua complex of manganese(II) (1–3) and chalcocyanide cluster complex [Re₄Te₄(CN)₁₂]^4? (1, 2). From XRD analysis, the cucurbituryl molecule is bound with one (1, 2) or two atoms of manganese (3) through oxygen atoms of carbonyl groups. Compound 2 has a chain structure where cluster complexes of rhenium are linked through bridge manganese atoms into a polymeric ribbon. Compounds 1 and 3 have the island-like type of structure.     

Zn-containing double complex salts formed by Keggin type polyoxotungstates: Synthesis and crystal structure

Novel double complex salts, [Zn(DMF)₆]₂[SiW₁₂O₄₀] · 2H₂O (I) and [Zn(H₂O)₂(DMF)₄][Zn(DMF)₆]₂[PW₁₂O₄₀]₂ · 6DMF (II) (DMF = N,N-dimethylformamide), were prepared by the reaction of Zn²⁺ and heteropoly acids H_x[EW₁₂O₄₀] · xH₂O (E = P, X = 3, E = Si, X = 4) in DMF. Compounds I and II were studied by X-ray diffraction (СIF files CCDC nos. 1497570 (I) and 1497571 (II)) and IR spectroscopy.     

Synthesis and thermal dehydration of hexaaquarhodium(III) phosphates

Complex salts [Rh(H₂O)₆]PO₄ (I) and [Rh(H₂O)₆]PO₄ · H₂O (II) were obtained. Dehydration processes of compounds I and II were studied by thermogravimetry and differential scanning calorimetry. The heat effect for the loss of 0.82 ± 0.01 H₂O (hydration) molecule was found to be 54 ± 1 kJ/mol, while that for the loss of coordinated H₂O is 47 ± 1 kJ/mol (for I) and 43 ± 1 kJ/mol (for II). The solid phases of dehydration products were studied by X-ray powder diffraction, IR and ³¹P MAS NMR spectroscopy, and they were found to be polymers.     

Synthesis,crystal structures,and properties of copper(II) dicarboxylate complexes with [bis(2-pyridylcarbonyl)amido]

Four new complexes, [Cu₂(Bpca)₂(L¹)(H₂O)₂] · 3H₂O (I), [Cu₂(Bpca)₂(L²)(H₂O)₂] (II), [Cu₂(Bpca)₂(L³)] · 2H₂O (III), [Cu₂(Bpca)₂(L¹)(H₂O)] · 2H₂O (IV) (Bpca = bis(2-pyridylcarbonyl)amido, H₂L¹ = glutaric acid, H₂L² = adipic acid, H₂L³ = suberic acid, H₂L⁴ = azelaic acid) have been synthesized and characterized by single-crystal X-ray diffraction methods (CIF files CCDC nos. 1432836 (I), 1432835 (II), 817411 (III), and 817412 (IV)), elemental analyses, IR spectra. Structural analyses reveal that compounds I, II, and IV have similar structures [Cu(Bpca)]⁺ units bridged by dicarboxylate forming dinuclear units, whereas the dinuclear of compound III are edge-shared through two carboxylate oxygen atoms of different suberate anions. Hydrogen bonds are response for the supramolecular assembly of compounds I to IV. The temperature-dependent magnetic property of III was also investigated in the temperature range of 2 to 300 K, and the magnetic behaviour suggests weak antiferromagnetic coupling exchange.     

Structure and catalytic activity of host–guest coordination polymers constructed from copper(I) cyanide nets and 1,4-diaminobutane or 1,5-diaminopentane in the presence of water

The reaction of K₃[Cu(CN)₄] and 1,4-diaminobutane (DAB) or 1,5-diaminopentane (DAP) in the presence of Me₃SnCl affords two monometallic host–guest Cu(I) cyanide polymers: {[H₂DAB][Cu₄(CN)₆]·2H₂O}, 1, and{[H₂DAP][H₃O][Cu₄(CN)₇]·2H₂O}, 2, with exclusion of Me₃Sn⁺ cation. The products were characterized by physicochemical and spectroscopic methods. The structure of 1 consists of two-dimensional hexagonal sheets of (CuCN) _n which stack along the b-axis creating honeycomb-shaped channels capable of encapsulating the protonated DAB and water molecules. The structure of 2 consists of a three-dimensional network of [Cu₄(CN)₇] with large cavities that include H₂DAP and water molecules. The rhombic minicycle [Cu₂(μ-CN)₂] fragments represent the basic building blocks of the network structure of 2. The structures of these compounds are stabilized by hydrogen bonding. The SCP 1 and SCP 2 exhibit good catalytic and photocatalytic activities for the degradation of methylene blue (MB) in the presence of H₂O₂. The efficiency of recycled SCP 1 and SCP 2 and the mechanism of degradation of MB dye were also investigated.