{"title":"A Newly Constructed Cobalt-Organic Coordination Polymer and Its Two Carbon-Based Composites Demonstrating Electrochemical Sensing to NO2− and Cr (VI)","authors":"Si-Wei Zong, Ting Guo, Yuan-Wen Yang, Kou-Lin Zhang","doi":"10.1002/aoc.70386","DOIUrl":null,"url":null,"abstract":"<div>\n \n <p>A novel cobalt-organic ionic coordination polymer, incorporating the multifunctional 2-iodo-4-sulfonatobenzoate anion (isba<sub>2</sub><sup>−</sup>) and the rigid nitrogen-containing ligand 4,4′-bipyridine (bipy) {[Co (bipy)(H<sub>2</sub>O)<sub>3</sub>(CH<sub>3</sub>CH<sub>2</sub>OH)]·isba·2H<sub>2</sub>O}<sub>n</sub> (Co-bipy), was synthesized via a straightforward solution evaporation method at room temperature. Two innovative carbon-based composite materials Co-bipy@MWCNTs and Co-bipy@GO were successfully fabricated through hybridization with multi-walled carbon nanotubes and graphene oxide, respectively. Experimental investigation indicates that the electrocatalytic ability of Co-bipy towards the NO<sub>2</sub><sup>−</sup> oxidation and Cr (VI) reduction can be enhanced by MWCNTs and GO. Among the three glassy carbon electrodes (GCE) modified with Co-bipy, Co-bipy@MWCNTs, and Co-bipy@GO, the Co-bipy@MWCNTs/GCE exhibits optimal performance for NO<sub>2</sub><sup>−</sup> oxidation sensing in 0.1 M PBS and Cr (VI) reduction sensing in 0.1 M H<sub>2</sub>SO<sub>4</sub>. The successful modification of Co-bipy@MWCNTs on the screen-printed electrode (SPE) further enhanced the electrocatalytic performance of Co-bipy@MWCNTs. The Co-bipy@MWCNTs/SPE shows the most efficient sensing to NO<sub>2</sub><sup>−</sup> and Cr (VI). The limits of detection (LOD) reach 0.13 μM for NO<sub>2</sub><sup>−</sup> and 0.25 μM for Cr (VI), respectively. Furthermore, the Co-bipy@MWCNTs/SPE was effectively employed for the accurate detection of NO<sub>2</sub><sup>−</sup> and Cr (VI) in the actual samples. The sensing mechanisms for NO<sub>2</sub><sup>−</sup> and Cr (VI) were illustrated with the aid of Hirshfeld surface analysis and density of states (DOS) calculations.</p>\n </div>","PeriodicalId":8344,"journal":{"name":"Applied Organometallic Chemistry","volume":"39 10","pages":""},"PeriodicalIF":3.7000,"publicationDate":"2025-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Organometallic Chemistry","FirstCategoryId":"92","ListUrlMain":"https://onlinelibrary.wiley.com/doi/10.1002/aoc.70386","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"CHEMISTRY, APPLIED","Score":null,"Total":0}
引用次数: 0
Abstract
A novel cobalt-organic ionic coordination polymer, incorporating the multifunctional 2-iodo-4-sulfonatobenzoate anion (isba2−) and the rigid nitrogen-containing ligand 4,4′-bipyridine (bipy) {[Co (bipy)(H2O)3(CH3CH2OH)]·isba·2H2O}n (Co-bipy), was synthesized via a straightforward solution evaporation method at room temperature. Two innovative carbon-based composite materials Co-bipy@MWCNTs and Co-bipy@GO were successfully fabricated through hybridization with multi-walled carbon nanotubes and graphene oxide, respectively. Experimental investigation indicates that the electrocatalytic ability of Co-bipy towards the NO2− oxidation and Cr (VI) reduction can be enhanced by MWCNTs and GO. Among the three glassy carbon electrodes (GCE) modified with Co-bipy, Co-bipy@MWCNTs, and Co-bipy@GO, the Co-bipy@MWCNTs/GCE exhibits optimal performance for NO2− oxidation sensing in 0.1 M PBS and Cr (VI) reduction sensing in 0.1 M H2SO4. The successful modification of Co-bipy@MWCNTs on the screen-printed electrode (SPE) further enhanced the electrocatalytic performance of Co-bipy@MWCNTs. The Co-bipy@MWCNTs/SPE shows the most efficient sensing to NO2− and Cr (VI). The limits of detection (LOD) reach 0.13 μM for NO2− and 0.25 μM for Cr (VI), respectively. Furthermore, the Co-bipy@MWCNTs/SPE was effectively employed for the accurate detection of NO2− and Cr (VI) in the actual samples. The sensing mechanisms for NO2− and Cr (VI) were illustrated with the aid of Hirshfeld surface analysis and density of states (DOS) calculations.
期刊介绍:
All new compounds should be satisfactorily identified and proof of their structure given according to generally accepted standards. Structural reports, such as papers exclusively dealing with synthesis and characterization, analytical techniques, or X-ray diffraction studies of metal-organic or organometallic compounds will not be considered. The editors reserve the right to refuse without peer review any manuscript that does not comply with the aims and scope of the journal. Applied Organometallic Chemistry publishes Full Papers, Reviews, Mini Reviews and Communications of scientific research in all areas of organometallic and metal-organic chemistry involving main group metals, transition metals, lanthanides and actinides. All contributions should contain an explicit application of novel compounds, for instance in materials science, nano science, catalysis, chemical vapour deposition, metal-mediated organic synthesis, polymers, bio-organometallics, metallo-therapy, metallo-diagnostics and medicine. Reviews of books covering aspects of the fields of focus are also published.