Effects of isomorphous substitution of a coordination polymer on the properties and its application in electrochemical sensing

• Published in: Journal of solid state chemistry 2014-07, Vol.215, p.109-113
• Main Authors: Zhou, Bo, Liang, Li-Mei, Yao, Jie
• Format: Article
• Language: English
• Subjects: AMPEROMETRY; CARBON; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Coordination polymers; Cross-disciplinary physics: materials science; rheology; DETECTION; Electrochemical sensing; Electrochemistry; Electrodes; Exact sciences and technology; FLUORESCENCE; FLUORESCENCE SPECTROSCOPY; Growth from solutions; HYDROTHERMAL SYNTHESIS; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; Isomorphous substitution; Materials science; Metal-organic coordination polymers; Methods of crystal growth; physics of crystal growth; NITRITES; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Pastes; Photoluminescence; Physics; POLYMERS; Raw materials; SENSITIVITY; Spectra; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; TYROSINE; X-RAY DIFFRACTION; Zinc
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2014.03.028

This work concerns the isomorphous substitution of coordination polymers (CPs) and its effect on the optical and electrochemical properties. The application of CPs in electrochemical sensing was studied as well. Isomorphous coordination polymers, [CoxZn1−xtyr]n (tyr=l-tyrosine), where x (0–1) was controlled by the Co/Zn ratios of raw materials, were successfully synthesized via a hydrothermal method, as proved by XRD and EDS results. Their UV–vis DRS and fluorescence spectra change gradually along with the composition. Cyclic voltammograms of modified electrodes, [CoxZn1−xtyr]n/GCE, show that as more and more Zn replaced Co, the current signal decreases greatly and the potential shifts negatively. Much attention was paid to [Cotyr]n due to its highest sensitivity. Refreshable modified carbon paste electrode, [Cotyr]n-CPE, was used to determine nitrite, and showed pretty good performance as evidenced by chronoamperometry. The response was made very fast within mere 5s. The linear detection range was from 5.00×10−5 to 3.45×10−3M, with sensitivity of 263.4mAmol−1Lcm−2. The detection limit was found to be 2.00×10−5M. The sensor also showed good antiinterference and reproducibility. Evolution of the optical and electrochemical properties of isomorphic coordination polymers [CoxZn1−xtyr]n along with the changing of x was studied. The CP also showed perfect performance in the electrochemical determination of nitrite. [Display omitted] •Isomorphous substitution of coordination polymers (CPs).•Substitution-caused evolution of optical and electrochemical properties of CPs.•Application of CPs in electrochemical sensing, an incipient area.•Perfect performance of CPs in electrochemical determination of nitrite.