A Newly Constructed Cobalt-Organic Coordination Polymer and Its Two Carbon-Based Composites Demonstrating Electrochemical Sensing to NO2− and Cr (VI)

IF 3.7 2区 化学 Q2 CHEMISTRY, APPLIED
Si-Wei Zong, Ting Guo, Yuan-Wen Yang, Kou-Lin Zhang
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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.

Abstract Image

新型钴-有机配位聚合物及其对NO2−和Cr (VI)电化学敏感的两种碳基复合材料
在室温下,采用直接溶液蒸发法合成了一种新型钴-有机离子配位聚合物,该聚合物由多功能2-碘-4-磺基苯甲酸阴离子(isba2−)和刚性含氮配体4,4′-联吡啶(bipy) {[Co (bipy)(H2O)3(CH3CH2OH)]·isba·2H2O}n (Co-bipy)组成。通过与多壁碳纳米管和氧化石墨烯的杂化,成功制备了两种新型碳基复合材料Co-bipy@MWCNTs和Co-bipy@GO。实验研究表明,MWCNTs和GO可以增强Co-bipy对NO2−氧化和Cr (VI)还原的电催化能力。在用Co-bipy、Co-bipy@MWCNTs和Co-bipy@GO修饰的三种玻璃碳电极(GCE)中,Co-bipy@MWCNTs/GCE在0.1 M PBS和0.1 M H2SO4中对NO2 -氧化和Cr (VI)还原的传感性能最佳。在丝网印刷电极(SPE)上成功修饰Co-bipy@MWCNTs进一步提高了Co-bipy@MWCNTs的电催化性能。Co-bipy@MWCNTs/SPE对NO2−和Cr (VI)的传感效果最好。NO2−的检测限为0.13 μM, Cr (VI)的检测限为0.25 μM。此外,Co-bipy@MWCNTs/SPE能有效地准确检测实际样品中的NO2−和Cr (VI)。通过Hirshfeld表面分析和态密度(DOS)计算,阐明了NO2−和Cr (VI)的传感机理。
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来源期刊
Applied Organometallic Chemistry
Applied Organometallic Chemistry 化学-无机化学与核化学
CiteScore
7.80
自引率
10.30%
发文量
408
审稿时长
2.2 months
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.
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