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. 2023 Feb 24;13:3214. doi: 10.1038/s41598-023-30198-7

Synthesis of a magnetic polystyrene-supported Cu(II)-containing heterocyclic complex as a magnetically separable and reusable catalyst for the preparation of N-sulfonyl-N-aryl tetrazoles

Mahmoud Nasrollahzadeh 1,✉, Narjes Motahharifar 1, Khatereh Pakzad 1, Zahra Khorsandi 1,5, Talat Baran 3, Jinghan Wang 4, Benjamin Kruppke 2, Hossein Ali Khonakdar 2,5
PMCID: PMC9958043  PMID: 36828906

Abstract

In this work, a cost-effective, environmentally friendly, and convenient method for synthesizing a novel heterogeneous catalyst via modification of polystyrene using tetrazole-copper magnetic complex [Ps@Tet-Cu(II)@Fe3O4] has been successfully developed. The synthesized complex was analyzed using TEM (transmission electron microscopy), HRTEM (high resolution-transmission electron microscopy), STEM (scanning transmission electron microscopy), FFT (Fast Fourier transform), XRD (X-ray diffraction), FT-IR (Fourier transform-infrared spectroscopy), TG/DTG (Thermogravimetry and differential thermogravimetry), ICP-OES (Inductively coupled plasma-optical emission spectrometry), Vibrating sample magnetometer (VSM), EDS (energy dispersive X-ray spectroscopy), and elemental mapping. N-Sulfonyl-N-aryl tetrazoles were synthesized in high yields from N-sulfonyl-N-aryl cyanamides and sodium azide using Ps@Tet-Cu(II)@Fe3O4 nanocatalyst. The Ps@Tet-Cu(II)@Fe3O4 complex can be recycled and reused easily multiple times using an external magnet without significant loss of catalytic activity.

Subject terms: Catalysis, Materials chemistry, Organic chemistry, Chemical synthesis

Introduction

Catalysts have been used widely for chemical transformations; especially organic reactions. However, the effective separation of homogeneous catalysts is a remarkable scientific and engineering challenge. The use of heterogeneous catalysts is an efficient method to solve this problem. Heterogeneous catalysts have many advantages such as easy recovery and recyclability from the reaction media using centrifugation, filtration, and magnetic alteration1–10. Heterogeneous catalysts can be immobilized on various supports such as graphene, polymers, magnetic nanoparticles, zeolite, carbon, mesoporous silica, and silica sol–gels11–26. In recent decades, polymer-based supports have been studied extensively due to their several specifications, well-controlled structure, and ease of functionalization15–21. For example, polystyrene (PS) is one of the extensively used polymers. The introduction of various functions to PS produces effective nanocomposite supports for heterogeneous catalysts17,20,21.

Nanomaterials are one of the most important types of compounds, which can be applied in different fields27–37. Metal nanoparticles (MNPs) are the most important nanomaterials38–45. MNPs have most of the particular features of an appropriate catalyst, including low price, great activity, high surface area, low toxicity, significant thermal stability, simple recoverability, and excellent recyclability46–56. From this perspective, MNPs-supported catalysts are associated with green chemistry and sustainability57–65. Among various MNPs, copper-based catalysts represent considerable catalytic activities. Copper has received wide attention as an effective transition metal owing to its remarkable advantages such as numerous sources, low cost, diversity, low environmental hazards, and extensive applications66–72. In recent years, scientists have tried to decrease the costs of organic reactions by replacing palladium with cheap metals such as copper73–75.

Today, researchers are paying a lot of attention to the field of catalysis76–82. Recently, magnetic NPs have been widely used as catalyst supports for different organic transformations13,18,20,57. The most important features of magnetic nanocatalysts include their high surface-to-volume ratio, which leads to high catalytic activities, high dispersion, and excellent stability. Moreover, these catalysts contain the green advantage of suitable and efficient recyclability, owing to their simplicity of separation using a magnet. Catalysts supported on super magnetic NPs have successfully catalyzed various organic reactions58,59. Among heterogeneous catalysts, magnetite/polymer nanocomposite is one of the most effective nanocomposites. Fe3O4 NPs dispersed on polymer surfaces are superparamagnetic catalysts in various chemical reactions17.

Tetrazole is an important synthetic compound with wide applications in various fields such as pharmacology, biochemistry, medicinal chemistry, photography, and imaging chemicals. In fact, various tetrazoles; especially 5-substituted 1H-tetrazoles and aminotetrazoles have been applied to synthesize biologically active compounds in recent years13,83–85. The [2 + 3] cycloaddition reaction is a conventional method for the synthesis of tetrazoles. Given the medicinal applications of tetrazoles, different synthetic methodologies have been widely developed for their synthesis.13,66,67,85.

Among tetrazoles, aminotetrazoles have received much attention because of their wide-ranging applications. However, the lack of convenient methods for the synthesis of these compounds or their derivatives such as N-sulfonyl-N-aryl tetrazoles strongly restricts their potential medical applications66,67,85. Thus, it is desirable to develop a convenient and efficient method for the synthesis of N-sulfonyl-N-aryl tetrazoles.

Following our research on the progress of modern catalytic systems, in this study, copper NPs immobilized on magnetic tetrazole‐functionalized polystyrene [Ps@Tet-Cu(II)@Fe3O4] have been investigated as a highly effective catalyst (Scheme 1). After the characterization of the synthesized complex by various techniques, the catalytic activity of the complex in the synthesis of N-sulfonyl-N-aryl tetrazoles was studied (Scheme 2).

Scheme 1.

Scheme 1

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Synthesis of Ps@Tet-Cu(II)@Fe3O4.

Scheme 2.

Scheme 2

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Synthesis of N-sulfonyl-N-aryl tetrazoles.

Experimental

Instruments and reagents

TEM, STEM, and NMR spectra were recorded on JEM-F200 JEOL, JEM-F200-TFEG-JEOL Ltd, and Bruker Avance DRX 600 MHz instruments, respectively. The FT-IR spectra and XRD patterns of the samples were obtained using a Perkin Elmer 100 spectrophotometer and a Philips model PW 1373 diffractometer, respectively. The elemental compositions of the synthesized nanoparticle were determined by EDS coupled with Map. STA 1500 Rheometric-Scientific conducted TGA measurements under N2 flow. VSM analysis was performed using a magnetometer at 298 K (LBKFB).

Synthesis of Ps@Tet-Cu(II)@Fe3O4

In a 250 mL beaker, a solution of 5-amino-1H-tetrazole (5 mmol), TMOS [(3-chloropropyl)trimethoxysilane)] (5 mmol) in DMF (60 mL) solvent was stirred for 24 h at 90 ℃. Chloromethylated polystyrene (2 g) and potassium carbonate (5 mmol) were then added to the reaction media, which was stirred for another 24 h at 120 ℃. After cooling the reaction mixture, the obtained Ps@Tet was filtrated, washed with DMF, and dried at 70 °C. Afterward, 1 g of Ps@Tet, 1.5 g of Fe3O4 NPs, and 50 mL of toluene were mixed vigorously under reflux conditions for 24 h. The synthesized Ps@Tet@Fe3O4 was then separated using an external magnet, washed with toluene, and dried at 70 °C. In the next step, 1 g of the obtained Ps@Tet@Fe3O4 and 0.5 g of CuCl2.6H2O were mixed constantly in 50 mL of ethanol solvent at 85 °C for one day. Upon completion of the reaction, the synthesized magnetic complex Ps@Tet-Cu(II)@Fe3O4 was separated using a magnet, washed with EtOH, and dried at 70 °C (Scheme 1).

General process for the synthesis of N-sulfonyl-N-aryl tetrazoles

In a 50 mL beaker, N-sulfonyl-N-aryl cyanamide (1 mmol), NaN3 (1.5 mmol), and Ps@Tet-Cu(II)@Fe3O4 (0.05 g) catalyst were continuously mixed in DMF (10 mL) solvent at 120 ℃. The progress of the reaction was followed by TLC. After completion of the reaction, the magnetic catalyst was separated by an external magnet. Afterward, 25 mL of hydrochloric acid (2 N) and 25 mL of ethyl acetate were added to the reaction mixture, which was then stirred vigorously. After the separation of the organic phase, the aqueous phase was extracted by ethyl acetate (25 mL) three times and the organic layer was concentrated. The product was then purified by recrystallization from ethanol. All products were identified by NMR and FT-IR spectroscopy66,67,85.

Characterization data of new product

4-Bromo-N-(3-bromophenyl)-N-(1H-tetrazol-5-yl)benzenesulfonamide

FT-IR (KBr, cm−1) 3445, 3137, 1632, 1576, 1468, 1398, 1364, 1232, 1171, 966, 813, 818, 747, 690, 608, 577, 548, 502; 1H NMR (600 MHz, DMSO-d6) δH = 7.83 (d, J = 8.6 Hz, 2H), 7.73 (d, J = 8.6 Hz, 2H), 7.50 (d, J = 8.0 Hz, 1H), 7.36 (s, 1H), 7.30 (t, J = 8.0 Hz, 1H), 7.22 (d, J = 8.0 Hz, 1H); 13C NMR (150 MHz, DMSO-d6) δC = 159.2, 140.5, 137.1, 132.1, 131.0, 130.6, 130.1, 129.8, 127.7, 126.2, 121.2; Anal. Calcd for C13H9Br2N5O2S: C, 34.01; H, 1.98; N, 15.25. Found: C, 34.13; H, 2.12; N, 15.37.

Result and discussion

Characterization of Ps@Tet-Cu(II)@Fe3O4

The XRD patterns of the synthesized Ps@Tet@Fe3O4 and Ps@Tet-Cu(II)@Fe3O4 complex are illustrated in Fig. 1. The XRD patterns demonstrate the presence of Fe3O4 NPs with diffraction angles of 30.2°, 35.8°, 43.5°, 53.7°, 57.2°, and 62.8°, which are assigned to the crystal planes of (220), (311), (400), (511), (440), and (533), respectively67.

Figure 1.

Figure 1

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XRD powder pattern of Ps@Tet@Fe3O4 (A) and Ps@Tet-Cu(II)@Fe3O4 (B).

FT-IR analysis was applied to confirm the presence of functional groups in complex interactions. The FT-IR spectra of the synthesized Ps@Tet, Ps@Tet@Fe3O4 and Ps@Tet-Cu(II)@Fe3O4 complex are illustrated in Fig. 2. The peaks at around 1153 cm-1, 1492 cm-1, 1650 cm-1, and 2922 cm-1 correspond to Si–O, N=N, C=N, and C–H (sp3) stretching vibrations, respectively. In addition, the peaks at 550 cm−1 and 3300–3450 cm-1 are due to the Fe–O bond stretching and O–H functional groups of Fe3O4, respectively67.

Figure 2.

Figure 2

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FT‐IR spectra of Ps@Tet (A), Ps@Tet@Fe3O4 (B) and Ps@Tet-Cu(II)@Fe3O4 (C).

The TEM analysis of Ps@Tet, Ps@Tet@Fe3O4 and Ps@Tet-Cu(II)@Fe3O4 was applied to confirm the formation of Cu NPs on the surface of Ps@Tet@Fe3O4 (Figs. 3, 4, 5). As observed in Figs. 3, 4, 5, Cu NPs have been successfully loaded on the Ps@Tet@Fe3O4. The TEM and HRTEM images illustrate the fine dispersion of Cu NPs with the size of 8–10 nm on the Ps@Tet@Fe3O4 surface, accumulated in sites corresponding to iron oxide NPs. The HRTEM and FFT images of the Ps@Tet-Cu(II)@Fe3O4 show that the nanoparticles are highly crystalline. The STEM image confirms a homogeneously assembled nanostructured catalyst (Figs. 4 and 5).

Figure 3.

Figure 3

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TEM images of Ps@Tet.

Figure 4.

Figure 4

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TEM, HRTEM, FFT and STEM images of Ps@Tet@Fe3O4.

Figure 5.

Figure 5

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TEM, HRTEM, FFT and STEM images of Ps@Tet-Cu(II)@Fe3O4.

The EDS spectroscopy was used to determine the composition of Ps@Tet@Fe3O4 and Ps@Tet-Cu(II)@Fe3O4 complex (Fig. 6). The EDS analysis shows the presence of desired elements in their chemical structure. Figure 6 confirms that C, O, Si, and Fe are the main components present in both Ps@Tet@Fe3O4 and Ps@Tet-Cu(II)@Fe3O4 along with Cu and Cl elements, which are present only in the Ps@Tet-Cu(II)@Fe3O4 complex, further reaffirming the formation of the final catalyst. The amount of Cu incorporated into the Ps@Tet-Cu(II)@Fe3O4 complex was found to be 19.7 w%, as measured by EDS. According to ICP-OES analysis, the amount of Cu is 7.6 wt.%.

Figure 6.

Figure 6

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EDS spectra of Ps@Tet@Fe3O4 (A) and Ps@Tet-Cu(II)@Fe3O4 (B).

Elemental mapping of Ps@Tet, Ps@Tet@Fe3O4, and Ps@Tet-Cu(II)@Fe3O4 are presented in Figs. 7, 8, 9. Elemental mapping was performed to determine the distribution of the elements on Ps@Tet-Cu(II)@Fe3O4 complex surface. Figures 7, 8, 9 confirm that C, O, Si, and N are main components present in Ps@Tet, Ps@Tet@Fe3O4, and Ps@Tet-Cu(II)@Fe3O4, along with Fe element, which was present only in the Ps@Tet@Fe3O4 and Ps@Tet-Cu(II)@Fe3O4 (Figs. 8 and 9). Additionally, the presence of Cl and Cu was determined using elemental mapping (Fig. 9); which indicated the uniform dispersion of Cu on the Ps@Tet@Fe3O4 surface.

Figure 7.

Figure 7

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Elemental mapping of Ps@Tet.

Figure 8.

Figure 8

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Elemental mapping of Ps@Tet@Fe3O4.

Figure 9.

Figure 9

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Elemental mapping of Ps@Tet-Cu(II)@Fe3O4.

The magnetic properties of the synthesized Ps@Tet-Cu(II)@Fe3O4 complex were studied using VSM, as shown in Fig. 10. The specific saturation magnetization values (Ms) were calculated to be 60 and 20 emu/g for Fe3O4 NPs and Ps@Tet-Cu(II)@Fe3O4 complex, respectively, indicating that the modification of the surface and the addition of portions have led to decreased saturation magnetizations. Therefore, this complex has superparamagnetic characteristics and high magnetization values, enabling its separation by an external magnet from the reaction mixture.

Figure 10.

Figure 10

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VSM analysis of Ps@Tet-Cu(II)@Fe3O4.

The TG/DTG analysis is a great technique to measure thermal stability. Therefore, the thermal stability of the synthesized complex was checked over a temperature range of 30–700 ℃ (Fig. 11). The polymer-supported Cu(II) complex is stable up to 300 ℃. The first step of degradation (up to 300 ℃) is due to the removal of water and organic solvents. The second mass reduction is related to the degradation of organic groups such as 5-amino-1H-tetrazole in the temperature range of 300–410 ℃. The final degradation stage corresponds to the complete decomposition of functional groups of the catalyst. This degradation occurs when the temperature increases from 500 to 600 ℃.

Figure 11.

Figure 11

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TG/DTG analysis of Ps@Tet-Cu(II)@Fe3O4.

Synthesis of N-sulfonyl-N-aryl tetrazoles

The catalytic performance of Ps@Tet-Cu(II)@Fe3O4 was investigated in the [2 + 3] cycloaddition reaction. The synthesis of N-sulfonyl-N-aryl tetrazoles by the reaction of N-sulfonyl-N-aryl cyanamide and NaN3 as a model reaction in the presence of Ps@Tet-Cu(II)@Fe3O4 complex as a novel catalyst was studied for this purpose.

In the first step, the optimization of the reaction conditions was performed using N-(4-chlorophenyl)-N-cyano-4-methylbenzenesulfonamide (1 mmol) as a model substrate, NaN3 (1.5 mmol), Ps@Tet-Cu(II)@Fe3O4 complex and DMF solvent at 120 ℃. The results of the optimization reactions are shown in Table 1. As observed, the reaction does not proceed in the absence of the catalyst.

Table 1.

Optimization of reaction conditionsa.

graphic file with name 41598_2023_30198_Figa_HTML.gif
Entry Catalyst (g) Time (min) Yieldb (%)
1 0 100 0
2 0.01 65 69
3 0.03 45 78
4 0.05 25 86
5 0.07 25 86
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a Reaction conditions: N-(4-chlorophenyl)-N-cyano-4-methylbenzenesulfonamide (1 mmol), NaN3 (1.5 mmol), Ps@Tet-Cu(II)@Fe3O4, DMF (10 mL), 120 ℃.

b Isolated yield.

After the optimization of the reaction, the efficiency of Ps@Tet-Cu(II)@Fe3O4 complex for the synthesis of various derivatives of N-sulfonyl-N-aryl tetrazole using various types of N-sulfonyl-N-aryl cyanamides containing electron-withdrawing as well as electron-donating groups was investigated (Table 2). Both groups on the aromatic ring of N-sulfonyl-N-aryl cyanamides favor the formation of the resulting target tetrazoles in high yields and short reaction times.

Table 2.

Synthesis of tetrazoles using Ps@Tet-Cu(II)@Fe3O4 complex.a

graphic file with name 41598_2023_30198_Figb_HTML.gif
Entry Initial substance Product Time (min) Yieldb (%) TON TOF (min−1)
1 graphic file with name 41598_2023_30198_Figc_HTML.gif graphic file with name 41598_2023_30198_Figd_HTML.gif 25 86 14,405 576
2 graphic file with name 41598_2023_30198_Fige_HTML.gif graphic file with name 41598_2023_30198_Figf_HTML.gif 30 85 14,237 474
3 graphic file with name 41598_2023_30198_Figg_HTML.gif graphic file with name 41598_2023_30198_Figh_HTML.gif 30 82 13,735 458
4 graphic file with name 41598_2023_30198_Figi_HTML.gif graphic file with name 41598_2023_30198_Figj_HTML.gif 30 84 14,070 469
5 graphic file with name 41598_2023_30198_Figk_HTML.gif graphic file with name 41598_2023_30198_Figl_HTML.gif 35 82 13,735 392
6 graphic file with name 41598_2023_30198_Figm_HTML.gif graphic file with name 41598_2023_30198_Fign_HTML.gif 30 83 13,902 463
7 graphic file with name 41598_2023_30198_Figo_HTML.gif graphic file with name 41598_2023_30198_Figp_HTML.gif 30 86 14,405 480
8 graphic file with name 41598_2023_30198_Figq_HTML.gif graphic file with name 41598_2023_30198_Figr_HTML.gif 30 84 14,070 469
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aReaction conditions: N-sulfonyl-N-aryl cyanamide (1 mmol), NaN3 (1.5 mmol), Ps@Tet-Cu(II)@Fe3O4 (0.05 g), DMF (10 mL), 120 ℃.

b Isolated yield.

The proposed mechanism for the synthesis of tetrazoles using Ps@Tet-Cu(II)@Fe3O4 complex is presented in Scheme 3. According to the reaction procedure, initially, an interaction occurs between the CN group of N-sulfonyl-N-aryl cyanamides in the presence of Ps@Tet-Cu(II)@Fe3O4 complex. Next, N3- addition to the activated CN group gives the intermediate (A). Finally, the intramolecular cyclization of (A) leads to the desired product. This method has merits including high yields, short reaction time, and lack of production of HN3 toxic gas85.

Scheme 3.

Scheme 3

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Proposed mechanism for the synthesis of tetrazoles.

Summary and discussion

N-Sulfonyl-N-aryl tetrazole derivatives are very new compounds synthesized and reported by our research groups in recent years. In two previous publications, the synthesis of these novel derivatives through different reaction conditions have been reported. For example, for the first time, the synthesis of N-sulfonyl-N-aryl tetrazole derivatives was carried out in the presence of NaN3, ZnBr2, and H2O under reflux conditions for 24 h85. Although the product yields were relatively good, the reaction time was very long. In another study, the synthesis of these derivatives using Cu NPs@Fe3O4-chitosan catalyst, NaN3, and H2O under reflux conditions was investigated66. The drawback of the latter synthesis procedure was still the long reaction time (22 h). In addition, in our recent study, the synthesis of N-sulfonyl-N-aryl tetrazole derivatives using magnetic chitosan functionalized trichlorotriazine-5-amino-1H-tetrazole copper(II) complex catalyst and DMF solvent under reflux conditions has been reported67. The reaction suffered from long reaction time (40 min). Nevertheless, in the present work, N-sulfonyl-N-aryl tetrazole derivatives have been synthesized with high efficiency (82–86%) and in very short reaction times (25–35 min).

Catalyst recyclability

Reusability of heterogeneous catalysts is the most important advantage for practical purposes; especially for industrial applications. After completing the reaction, this magnetic complex was separated easily from the reaction media by an external magnet, washed with ethanol, dried, and reused for the same reaction without any significant reduction in the desired yields. Ps@Tet-Cu(II)@Fe3O4 exhibited a high activity over five runs, which confirms the catalyst stability. After the last run, the characterization of the recovered catalyst by TEM analysis (Fig. 12) showed a stable morphology and relatively dispersed NPs even after five runs as well as the stable structure of the recycled catalyst. To check the heterogeneity of Ps@Tet-Cu(II)@Fe3O4 catalyst, the filtrate of each cycle was analyzed by ICP-OES analysis. It was shown that less than 0.1% of the total amount of the original copper species was lost in the solution during a reaction.

Figure 12.

Figure 12

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TEM image of the recycled Ps@Tet-Cu(II)@Fe3O4.

Conclusions

A novel, easily recoverable, and suitable heterogeneous catalyst has been developed for the synthesis of N-sulfonyl-N-aryl tetrazole derivatives. The significant advantages of Ps@Tet-Cu(II)@Fe3O4 complex as a magnetic nanocatalyst are its high surface area, simple separation, and outstanding stability. Afterward, the morphology and structure of the synthesized complex were investigated using TEM, HRTEM, STEM, FFT, XRD, FT-IR, TG/DTG, VSM, EDS, and elemental mapping. The catalytic activity of the obtained complex for the synthesis of N-sulfonyl-N-aryl tetrazole derivatives was checked. The advantages of the method include easy work-up, high yields, and avoidance of the use of harmful and hazardous hydrazoic acid. The magnetic nanocatalyst is environmentally friendly and commercial because it can be recovered using an external magnet and reused in the same reaction without considerable loss of catalytic activity.

Acknowledgements

The supports from Iranian Nano Council and the University of Qom are appreciated.

Author contributions

M.N.: Supervision, Visualization, Validation, Writing—review and editing, Resources, Formal Analysis, N.M.: Methodology, Formal Analysis, Investigation, K.P.: Resources, Conceptualization, Investigation, Z.K.: Resources, Conceptualization, Investigation, Formal Analysis, T.B.: Conceptualization, Methodology, Writing: Original Draft, Formal Analysis, J.W.: Project administration, Fund Acquisition, Analysis, B.K.: Conceptualization, Methodology, Investigation, Formal Analysis, H.A.K.: Conceptualization, Methodology, Investigation, Formal Analysis.

Data availability

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Competing interests

The authors declare no competing interests.

Footnotes

Publisher's note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Data Availability Statement

The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

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