Dibenzocyclamnickel(II) as Ionophore in PVC-Matrix for Ni2+-Selective Sensor

Sensors

Vinod K. Gupta¹  Rajendra Prasad¹ 

[1] Department of Chemistry, Indian Institute of Technology, Roorkee, Roorkee -247667, India

关键词: Dibenzocyclam;    Ni2+;    Potentiometric Sensor;    PVC;    Selectivity;   

DOI  :  10.3390/s21000384

来源: mdpi

【 摘 要 】

The tetramethyldibenzocyclam derivative, was synthesized and characterized and was used for fabrication of potentiometric sensor for Ni²⁺ metal ion. 5,7,8,14-tetramethyldibenzo[b,i]-1,4,8,11-tetrazacyclotetradecanenickel(II)chloride, ([Ni(Me₄Bzo₂[14]ane N₄)]Cl₂) (II) was obtained in good yield as orange red salt by Fe/HCl reduction of the corresponding tetraazaannulene complex [Ni(Me4Bzo₂taa)], (I). Membrane having [Ni(Me₄Bzo₂[14]aneN₄)]Cl₂ (II) as electroactive material, sodium tetraphenylborate (NaTPB) as an anion discriminator, dibutyl butylphosphonate (DBBP) as plasticizer in PVC matrix in the percentage ratio 5.0:2.5:200:200 (II:NaTPB:DBBP:PVC)(w/w) exhibits a linear response to Ni²⁺ in the concentration range 7.0×10^-6- 1.0×10^-1M with a slope of 29.8±0.2 mV/decade of activity and a fast response time of 12s. The sensor works well in the pH range 2.0-7.6 and can be satisfactorily used in presence of 40% (v/v) methanol, ethanol or acetone. The sensor is highly selective for Ni²⁺ over a large number of mono-, biand trivalent cations. The sensor has been successfully used as indicator electrode in the potentiometric titration of Ni²⁺ against EDTA. These electrodes can be used to determine the concentration of Ni²⁺ in real samples.

【 授权许可】

CC BY   
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